TRANSWITCH CORP /DE
S-3/A, 2000-09-27
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>

    As filed with the Securities and Exchange Commission on September 27, 2000
                          Registration No. 333-44040

================================================================================

                      SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC 20549
                           _______________________
                              Amendment No. 1 to
                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                           ________________________
                            TranSwitch Corporation
            (Exact name of Registrant as specified in its charter)
                           ________________________
                   Delaware                                 06-1236189
        (State or other jurisdiction                     (I.R.S. Employer
     of incorporation or organization)                Identification Number)

                            Three Enterprise Drive
                          Shelton, Connecticut  06484
                                (203) 929-8810
              (Address, including zip code, and telephone number,
       including area code, of Registrant's principal executive offices)
                           ________________________
                                Dr. Santanu Das
                     President and Chief Executive Officer
                            TranSwitch Corporation
                            Three Enterprise Drive
                          Shelton, Connecticut 06484
                                (203) 929-8810
           (Name, address, including zip code, and telephone number,
                  including area code, of agent for service)
                           ________________________
Copies of all communications, including all communications sent to the agent for
                          service, should be sent to:

                           Timothy C. Maguire, Esq.
                        Testa, Hurwitz & Thibeault, LLP
                                125 High Street
                         Boston, Massachusetts  02110
                                (617) 248-7000

  Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration Statement becomes effective.
  If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [_]
  If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
  If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following. [_]

<TABLE>
<CAPTION>
                                                       ________________________
                                                    CALCULATION OF REGISTRATION FEE
  ==================================================================================================================================
                                                                   Proposed Maximum      Proposed Maximum
             Title of Each Class of              Amount to be     Offering Price Per    Aggregate Offering          Amount of
          Securities to be Registered           Registered (1)         Share (2)             Price (2)        Registration Fee (2)
  ----------------------------------------------------------------------------------------------------------------------------------
    <S>                                         <C>               <C>                   <C>                   <C>
    Common Stock, $.001 par value per share         261,088            63.00               16,448,544               4,342(3)
  ==================================================================================================================================
</TABLE>

  (1) Plus such additional shares as may be required to be registered in the
      event of a stock dividend, recapitalization or other similar change in
      common stock.
  (2) Estimated pursuant to Rule 457(c) under the Securities Act of 1933, as
      amended, solely for purposes of calculating the registration fee, based
      upon the average of the high and low prices per share as reported on the
      Nasdaq National Market on September 26, 2000.
  (3) $2,775 previously paid.
  _________________________
  TranSwitch hereby amends this Registration Statement on such date or dates as
may be necessary to delay its effective date until TranSwitch shall file a
further amendment which specifically states that this Registration Statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to Section 8(a), may
determine.
================================================================================


<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ The information in this prospectus is not complete and may be changed. We may+
+ not sell these securities until the registration statement filed with the    +
+ Securities and Exchange Commission is effective. This prospectus is not an   +
+ offer to sell securities, and we are not soliciting offers to buy these      +
+ securities.                                                                  +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

PROSPECTUS
----------

             SUBJECT TO COMPLETION, DATED September 27, 2000


                            TRANSWITCH CORPORATION

                                261,088 Shares

                                 Common Stock

     This prospectus relates to the public offering, which is not being
underwritten, of 261,088 shares of our common stock that are held by some of our
current stockholders.

     Our common stock is traded on the Nasdaq National Market under the symbol
"TXCC."  The last reported sales price of the common stock on the Nasdaq
National Market on September 26, 2000 was $63.75 per share.

                          __________________________

                 Investing in our common stock involves risks.
                    See "Risk Factors" beginning on page 4.

                          __________________________

     The Securities and Exchange Commission and state securities regulators have
not approved or disapproved these securities, or determined if this prospectus
is truthful or complete. Any representation to the contrary is a criminal
offense.



            The date of this prospectus is ________________, 2000.


                                       2
<PAGE>

You should rely only on the information contained in this prospectus.  We have
not authorized anyone to provide you with information different from that
contained in this prospectus.  We are offering to sell, and seeking offers to
buy, shares of common stock only in jurisdictions where offers and sales are
permitted.  The information contained in this prospectus is accurate only as of
the date of this prospectus, regardless of the time of delivery of this
prospectus or of any sale of our common stock.  In this prospectus, references
to the "Company," "TranSwitch," "we," "us" and "our" refer to TranSwitch
Corporation, a Delaware corporation, and its subsidiaries.


                           ________________________

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                     Page
                                                                     ----
<S>                                                                   <C>
Our Company.......................................................      4
Recent Developments...............................................      4
Disclosure Regarding Forward-Looking Statements...................      4
Risk Factors......................................................      4
Use of Proceeds...................................................     15
Selling Stockholders..............................................     15
Plan of Distribution..............................................     16
Legal Matters.....................................................     18
Experts...........................................................     19
Where You Can Find More Information...............................     19
</TABLE>

                           ________________________

We own or have rights to trademarks or tradenames that we use in conjunction
with the sale of our products. TranSwitch is a registered trademark owned by us.

                                       3
<PAGE>

                                  OUR COMPANY

     TranSwitch was incorporated in Delaware on May 26, 1988. Our executive
office is located at 3 Enterprise Drive, Shelton, Connecticut, and our telephone
number is (203) 929-8810.


                              RECENT DEVELOPMENTS

     During the third quarter of 2000, we sold $460 million of 4 1/2%
convertible notes due 2005 in a private placement. In connection with the
transaction, we received net proceeds, prior to payment of anticipated expenses,
of $445,125,000. The notes are convertible into our common stock at a conversion
price of $61.92 per share. We intend to use the net proceeds of the offering for
general corporate purposes, including working capital. In addition, we may use a
portion of the net proceeds to acquire or invest in complementary business,
products or technologies if the opportunity arises.

                DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

     This prospectus and the documents incorporated by reference contain
forward-looking statements including, without limitation, statements concerning
the future of the industry, product development, business strategy (including
the possibility of future acquisitions), continued acceptance and growth of our
products and dependence on significant customers. These statements can be
identified by the use of forward-looking terminology such as "may," "will,"
"expect," "anticipate," "estimate," "continue" or other similar words. These
statements discuss future expectations, contain projections of results of
operations or of financial condition or state other forward-looking information.
When considering forward-looking statements, you should keep in mind the risk
factors and other cautionary statements in this prospectus. The risk factors
noted below and other factors noted through this prospectus could cause our
actual results to differ significantly from those contained in any forward-
looking statement.


                                  RISK FACTORS

     You should carefully consider the following risks before making an
investment decision. Our business, operating results and financial condition
could be adversely affected by any of the following risks. The risks described
below are not the only ones that we face. Additional risks that are not yet
identified or that we currently think are immaterial may also impair our
business operations. You should also refer to the other information set forth in
this prospectus, including our consolidated financial statements and the related
notes.

RISKS RELATED TO OUR BUSINESS

WE EXPERIENCE FLUCTUATIONS IN OUR OPERATING RESULTS DUE TO A NUMBER OF
FREQUENTLY CHANGING BUSINESS CONDITIONS, WHICH MAY CAUSE OUR STOCK PRICE TO
DECLINE

     Our quarterly and annual operating revenues, expenses and operating results
may fluctuate due to a number of factors including:

<TABLE>
<S>                                                   <C>
 .  The timing and cancellation of customer            .  Our ability to introduce new products and
   orders.                                               technologies on a timely basis.
 .  Market acceptance of our and our customers'        .  Introduction of products and technologies by
   products.                                             our competitors.
 .  The level of orders received that can be           .  The timing of our investments in research and
   shipped in a quarter.                                 development, including tooling expenses
 .  The timing and provisions of pricing                  associated with product development and pre-
   protections and returns from our distributors.        production.
 .  Availability of foundry capacity and raw           .  Our customers practice of buying from a distributor
   materials.                                            or directly from us.
</TABLE>

                                       4
<PAGE>

<TABLE>
<S>                                                   <C>
 .  Fluctuations in manufacturing yields.              .  Competitive pressures on selling prices.
 .  Changes in product mix.                            .  Seasonality of customer buying patterns.
                                                      .  Cyclicality of the semiconductor industry; and
                                                      .  General economic conditions.
</TABLE>

     Sudden shortages of raw materials or production capacity constraints can
lead producers to allocate available supplies or capacity to larger customers
than us, which could interrupt our ability to meet our production obligations.
Historically, average selling prices in the semiconductor industry have
decreased over the life of a product, and as a result, the average selling
prices of our products may decrease in the future. Decreases in the price of our
products would adversely affect our operating results.

     Our business is characterized by short-term orders and shipment schedules,
and customer orders typically can be canceled or rescheduled without significant
penalty to our customer. Because we do not have substantial noncancellable
backlog, we typically plan our production and inventory levels based on internal
forecasts of customer demand, which are highly unpredictable and can fluctuate
substantially.

     Because we are continuing to increase our operating expenses for personnel
and new product development and for inventory in anticipation of increasing
sales levels, we must continue to generate increased sales to offset these
increased expenses. In addition, we are limited in our ability to reduce costs
quickly in response to any revenue shortfalls. In response to anticipated long
lead times to obtain inventory and materials from our foundries, we may order in
advance of anticipated customer demand, which might result in excess inventory
levels if the expected orders fail to materialize. As a result, we cannot
predict the timing and amount of sales to our customers, and any significant
downturn in customer demand for our products would reduce our quarterly and our
annual operating results.


OUR RAPID GROWTH MAY STRAIN OUR RESOURCES, AND WE MAY NOT BE ABLE TO MANAGE
FUTURE GROWTH

     Due to the level of technical and marketing expertise necessary to support
our existing and new customers, we must attract highly qualified and well-
trained personnel. There may be only a limited number of persons with the
requisite skills to serve in these positions and it may become increasingly
difficult for us to hire such personnel. As we expand, we may also significantly
strain our management, manufacturing, financial systems and other resources. We
cannot be certain that our systems, procedures, controls and existing space will
be adequate to support our operations.


WE RELY ON OUTSIDE FABRICATION FACILITIES AND OUR BUSINESS COULD BE HURT IF OUR
RELATIONSHIPS WITH OUR FOUNDRY SUPPLIERS ARE DAMAGED

     We do not own or operate a Very Large Scale Integrated (VLSI) Circuit
fabrication facility. Seven foundries currently supply us with most of our
semiconductor device requirements. While we have had good relations with these
foundries, we cannot be certain that we will be able to renew or maintain
contracts with them or negotiate new contracts to replace ones that expire. In
addition, we cannot be certain that renewed or new contracts will obtain terms
as favorable as our current terms. There are other significant risks associated
with our reliance on outside foundries, including the following:

     .  The lack of assured semiconductor wafer supply and control over delivery
        schedules.
     .  The unavailability of, or delays in obtaining access to, key process
        technologies.
     .  Limited control over quality assurance, manufacturing yields and
        production costs.

                                       5
<PAGE>


RELIANCE ON THIRD-PARTY FABRICATION FACILITIES LIMITS OUR CONTROL OF THE
MANUFACTURING PROCESS


     Manufacturing integrated circuits is a highly complex and
technology-intensive process. Although we try to diversify our sources of
semiconductor device supply and work closely with our foundries to minimize the
likelihood of reduced manufacturing yields, our foundries occasionally
experience lower than anticipated manufacturing yields, particularly in
connection with the introduction of new products and the installation and start-
up of new process technologies. Such reduced manufacturing yields have at times
reduced our operating results. A manufacturing disruption at one or more of our
outside foundries, including as a result of natural occurrences, could impact
production for an extended period of time.


OUR DEPENDENCE ON A SMALL NUMBER OF FABRICATION FACILITIES EXPOSES US TO RISKS
OF INTERRUPTIONS IN DELIVERIES OF SEMICONDUCTOR DEVICES


     We purchase semiconductor devices from outside foundries pursuant to
purchase orders, and we do not have a guaranteed level of production capacity at
any of our foundries. We provide the foundries with rolling forecasts of our
production requirements. However, the ability of each foundry to provide wafers
to us is limited by the foundry's available capacity. Therefore, our foundry
suppliers could choose to prioritize capacity for other customers or reduce or
eliminate deliveries to us on short notice. Accordingly, we cannot be certain
that our foundries will allocate sufficient capacity to satisfy our
requirements.


     We have been, and expect in the future to be, particularly dependent upon a
limited number of foundries for our VLSI device requirements. In particular, as
of the date of this prospectus, a single foundry supplier manufactures all of
our BiCMOS devices. As a result, we expect that we could experience substantial
delays or interruptions in the shipment of our products due to the following:


     .  Sudden demand for an increased amount of semiconductor devices or sudden
        reduction or elimination of any existing source or sources of
        semiconductor devices.
     .  Time required to qualify alternative manufacturing sources for existing
        or new products could be substantial.
     .  Failure to find alternative manufacturing sources to produce VLSI
        devices with acceptable manufacturing yields.


WE MUST SUCCESSFULLY TRANSITION TO NEW PROCESS TECHNOLOGIES TO REMAIN
COMPETITIVE

     Our future success depends upon our ability to do the following:

     .  To develop products that utilize new process technologies.
     .  To introduce new process technologies to the marketplace ahead of
        competitors.
     .  To have new process technologies selected to be designed into products
        of leading systems manufacturers.


     Semiconductor design and process methodologies are subject to rapid
technological change and require large expenditures for research and
development. We currently manufacture our products using 0.8, 0.5, 0.35 and 0.25
micron CMOS processes and a 1.0 micron BiCMOS process. We continuously evaluate
the benefits, on a product-by-product basis, of migrating to smaller geometry
process technologies. We are migrating to 0.18 micron CMOS process, and we
anticipate that we will need to migrate to smaller CMOS processes. Other
companies in the industry have experienced difficulty in transitioning to new
manufacturing processes and,

                                       6
<PAGE>


consequently, have suffered reduced yields or delays in product deliveries. We
believe that transitioning our products to smaller geometry process technologies
will be important for us to remain competitive, and we cannot be certain that we
can make such a transition successfully, if at all, without delay or
inefficiencies.


OUR SUCCESS DEPENDS ON THE TIMELY DEVELOPMENT OF NEW PRODUCTS AND WE FACE RISKS
OF PRODUCT DEVELOPMENT DELAYS

     Our success depends upon our ability to develop new VLSI devices and
software for existing and new markets. The development of these new devices and
software is highly complex, and from time to time we have experienced delays in
completing the development of new products. Successful product development and
introduction depends on a number of factors, including the following:

     .  Accurate new product definition.
     .  Timely completion and introduction of new product designs.
     .  Availability of foundry capacity.
     .  Achievement of manufacturing yields.
     .  Market acceptance of our products and our customers' products.

     Our success also depends upon our ability to do the following:

     .  Build products to applicable standards.
     .  Develop products that meet customer requirements.
     .  Adjust to changing market conditions as quickly and cost-effectively as
        necessary to compete successfully.
     .  Introduce new products that achieve market acceptance.
     .  Develop reliable software to meet our customers' application needs in a
        timely fashion.


     In addition, we cannot ensure that the systems manufactured by our
customers will be introduced in a timely manner or that such systems will
achieve market acceptance.


OUR REVENUES DEPEND ON THE SUCCESS OF OUR CUSTOMERS' PRODUCTS

     Our customers generally incorporate our new products into their products or
systems at the design stage. However, customer decisions to use our products
(design wins), which can often require significant expenditures by us without
any assurance of success, often precede the generation of volume sales, if any,
by a year or more. Moreover, the value of any design win largely will depend
upon the commercial success of the customer's product and on the extent to which
the design of the customer's systems accommodates components manufactured by our
competitors. We cannot ensure that we will continue to achieve design wins in
customer products that achieve acceptance.

                                       7
<PAGE>

OUR REVENUES AND PROFITS MAY DECREASE IF WE LOSE ANY OF OUR SIGNIFICANT
CUSTOMERS

     Historically, a relatively small number of customers have accounted for a
significant portion of our total revenues in any particular period. We have no
long-term volume purchase commitments from any of our significant customers. The
following table sets forth, for the periods indicated, the percentage of our
total revenues derived from our significant distributors and customers:


<TABLE>
<CAPTION>
                                                                               Six Months Ended
                                                  Year ended December 31,          June 30,
                                              -------------------------------  ----------------
Distributors                                   1997        1998         1999         2000
------------                                  ------     -------       ------  ----------------
<S>                                           <C>        <C>          <C>      <C>
Insight Electronics Inc. (1)........            39%        19%          33%          32%
Reptron Electronics, Inc.(2)........            15%         *            *            *
Arrow Electronics, Inc. (2).........             *         16%          18%          12%
Coltek Technology (1)...............             *         14%           *            *
Unique Memec (1)....................             *          *            *           16%
                                             -------     -------       ------  ----------------
<CAPTION>
Customers                                      1997        1998         1999         2000
---------                                     ------     -------       ------  ----------------
<S>                                           <C>        <C>           <C>     <C>
Tellabs Operations, Inc. (1)(2)(3).             15%        20%          13%          15%
Lucent Technologies, Inc. (1)(3)(4).             *          *           16%          10%
Nortel Networks Corporation (2)(3)..             *          *           13%           *
Ericsson Telecommunications, Inc.(1)(3)          *          *            *           12%
</TABLE>
_____________

*Below 10% of our total revenues.
(1)  Insight Electronics, Coltek Technology (formerly Columbia Technology) and
     Unique Memec are distributors of our products to various end-users, none of
     which comprised more than 10% of our total revenues during 1997 and 1998.
     In 1999 and the six months ended June 30, 2000, a portion of Lucent
     Technologies' purchases were shipped through Insight Electronics. In the
     six months ended June 30, 2000, a portion of Ericsson Telecommunications'
     purchases were shipped through Unique Memec and a portion of Tellabs
     Operations' purchases were shipped through Insight Electronics.
(2)  Our sales to Tellabs Operations during 1999 and the six months ended June
     30, 2000 were made through Arrow Electronics, which also shipped products
     to Nortel Networks. Sales to Tellabs Operations through Arrow Electronics
     during 1998 represented 16% of our total revenues. During 1998, sales to
     Tellabs Operations were made through Reptron Electronics and Arrow
     Electronics, both Tellabs Operations' designated distributors. Our sales to
     Tellabs Operations during 1997 were made through Reptron Electronics,
     Tellabs Operations' designated distributor.
(3)  Represents total shipments, including those made directly and those
     made through distributors.
(4)  Includes sales to Ascend Communications, which was acquired by Lucent
     Technologies during 1999.  This percentage represents total shipments,
     including those made directly and those made through distributors.

     We anticipate that sales of our products to relatively few customers will
continue to account for a significant portion of our total revenues. Due to
these factors, some of the following may reduce our operating results:

     .  Reduction, delay or cancellation of orders from one or more of our
        significant customers.
     .  Development by one or more of our significant customers or other sources
        of supply for current or future products.
     .  Loss of one or more of our current customers or a disruption in our
        sales and distribution channels.
     .  Failure of one of our significant customers to make timely payment of
        our invoices.

     We cannot be certain that our current customers will continue to place
orders with us, that orders by existing customers will continue at the levels of
previous periods or that we will be able to obtain orders from new customers.

                                       8
<PAGE>

OUR FAILURE TO PROTECT OUR PROPRIETARY RIGHTS, OR THE COSTS OF PROTECTING THESE
RIGHTS, MAY HARM OUR ABILITY TO COMPETE

     Our success depends in part on our ability to obtain patents and licenses
and to preserve other intellectual property rights covering our products and
development and testing tools. To that end, we have obtained certain domestic
and foreign patents and intend to continue to seek patents on our inventions
when appropriate. The process of seeking patent protection can be time consuming
and expensive. We cannot ensure the following:

     .  That patents will issue from currently pending or future applications.
     .  That our existing patents or any new patents will be sufficient in scope
        or strength to provide meaningful protection or any commercial advantage
        to us.
     .  That foreign intellectual property laws will protect our intellectual
        property rights.
     .  That others will not independently develop similar products, duplicate
        our products or design around any patents issued to us.

     Intellectual property rights are uncertain and involve complex legal and
factual questions. We may be unknowingly infringing on the proprietary rights of
others and may be liable for that infringement, which could result in
significant liability for us. For example, we are not aware of any third party
intellectual property rights that would prevent our use and sale of our
products, although we have received correspondence from others alleging
infringement. If we do infringe the proprietary rights of others, we could be
forced to either seek a license to intellectual property rights of others or
alter our products so that they no longer infringe the proprietary rights of
others. A license could be very expensive to obtain or may not be available at
all. Similarly, changing our products or processes to avoid infringing the
rights of others may be costly or impractical.

     We are responsible for any patent litigation costs. If we were to become
involved in a dispute regarding intellectual property, whether ours or that of
another company, we may have to participate in legal proceedings in the United
States Patent and Trademark Office or in the United States courts to determine
one or more of patent validity, patent infringement, patent ownership or
inventorship. These types of proceedings may be costly and time consuming for
us, even if we eventually prevail. If we do not prevail, we might be forced to
pay significant damages, obtain a license, if available, or stop making a
certain product.

     We also rely on trade secrets, proprietary know-how and confidentiality
provisions in agreements with employees and consultants to protect our
intellectual property. Other parties may not comply with the terms of their
agreements with us and we may not be able to adequately enforce our rights
against these people.


OUR BUSINESS COULD BE HARMED IF WE FAIL TO ADEQUATELY INTEGRATE THE OPERATIONS
OF EASICS NV AND ALACRITY COMMUNICATIONS, INC.

     Our management must devote substantial time and resources to the
integration of the operations of Easics NV, with which we completed a share-for-
share exchange agreement in May 2000, and Alacrity Communications, Inc. which
we acquired in August 2000. The process of integrating research and development
initiatives, computer and accounting systems and other aspects of the operations
of Easics and Alacrity presents a significant challenge to our management. This
is compounded by the challenge of simultaneously managing a larger entity. In
addition, the operations and personnel of Easics are located in Belgium, and the
operations and personnel of Alacrity are located in

                                       9
<PAGE>

California, thus requiring management from a considerable distance. The
transactions with Easics and Alacrity present a number of additional
difficulties of integration, including:

     .  Difficulties in integrating personnel with disparate business
        backgrounds and cultures.
     .  Difficulties in defining and executing a comprehensive product strategy.
     .  Difficulties in minimizing the loss of key employees of Easics and
        Alacrity.

     If we delay integrating or fail to integrate the Easics and Alacrity
operations or experience other unforeseen difficulties, the integration process
may require a disproportionate amount of our management's attention and
financial and other resources. Our failure to address these difficulties
adequately could harm our business or financial results and we could fail to
realize the anticipated benefits of the transactions.

WE MAY ENGAGE IN ACQUISITIONS THAT MAY HARM OUR OPERATING RESULTS, DILUTE OUR
STOCKHOLDERS AND CAUSE US TO INCUR DEBT OR ASSUME CONTINGENT LIABILITIES

     We may pursue acquisitions that could provide new technologies, products or
service offerings. Future acquisitions by us may involve the following:

     .  Use of significant amounts of cash.
     .  Potentially dilutive issuances of equity securities.
     .  Incurrence of debt or amortization expenses related to goodwill and
        other intangible assets.

     In addition, acquisitions involve numerous risks, including:

     .  Difficulties in the assimilation of the operations, technologies,
        product and personnel of the acquired company.
     .  Diversion of management's attention from other business concerns.
     .  Risks of entering markets in which we have no or limited prior
        experience.
     .  Potential loss of key employees of the acquired company.

     From time to time, we have engaged in discussions with third parties
concerning potential acquisitions of product lines, technologies and businesses.
However, we currently have no commitments or agreements with respect to any such
acquisition. If such an acquisition does occur, we cannot be certain that our
business, operating results and financial condition will not be materially
adversely affected.


WE HAVE SUBSTANTIALLY INCREASED OUR INDEBTEDNESS

     In the third quarter of 2000, we sold $460 million of 4 1/2% convertible
notes due 2005 in a private placement. As a result of the sale of the notes, we
incurred $460 million of additional indebtedness, substantially increasing our
ratio of debt to total capitalization. We may incur substantial additional
indebtedness in the future. The level of our indebtedness, among other things,
could:

     .  Make it difficult for us to make payments on the notes.
     .  Make it difficult for us to obtain any necessary future financing for
        working capital expenditures, debt service requirements or other
        purposes.
     .  Limit our flexibility in planning for, or relating to changes in, our
        business.
     .  Makes us more vulnerable in the event of a downturn in our business.


     There can be no assurance that we will be able to meet our debt service
obligations, including our obligations under the notes.


WE MAY NOT BE ABLE TO PAY OUR DEBT AND OTHER OBLIGATIONS

     If our cash flow is inadequate to meet our obligations, we could face
substantial liquidity problems. If we are unable to generate sufficient cash
flow or otherwise obtain funds necessary to make required payments on the notes
or our other obligations, we would be in default under the terms of the notes,
which would permit the holders of the notes to accelerate the maturity of the
notes and also could cause defaults under future indebtedness we may incur. Any
such default could have a material adverse effect on our business, prospects,
financial conditions and operating results. In addition, we cannot assure you
that we would be able to repay amounts due in respect of the notes if payment of
the notes were to be accelerated following the occurrence of an event of
default.


WE FACE INTENSE COMPETITION IN THE SEMICONDUCTOR MARKET

     The semiconductor industry is intensely competitive and is characterized
by the following:

     .  Rapid technological change.
     .  Shortage in fabrication capacity.
     .  Price erosion.
     .  Unforeseen manufacturing yield problems.
     .  Heightened international competition in many markets.


                                     10
<PAGE>

     These factors are likely to result in pricing pressures on our products,
potentially affecting our margins.

     Our ability to compete successfully in the rapidly evolving area of high
performance integrated circuit technology depends on factors both within and
outside our control, including:

     .  Success in designing and subcontracting the manufacture of new products
        that implement new technologies.
     .  Protection of our products by effective use of intellectual
        property laws.
     .  Product quality.
     .  Reliability.
     .  Price.
     .  Efficiency of production.
     .  The pace at which customers incorporate our integrated circuits into
        their products.
     .  Success of competitors' products.
     .  General economic conditions.

     The telecommunications and data communications industries, which are our
primary target markets, have become intensely competitive because of
deregulation and heightened international competition.



THE LOSS OF KEY MANAGEMENT COULD AFFECT OUR ABILITY TO RUN OUR BUSINESS

     Our success depends largely upon the continued service of our executive
officers, including Dr. Santanu Das, President, Chief Executive Officer and
Chairman of the Board of Directors, and other key management and technical
personnel and on our ability to continue to attract, retain and motivate other
qualified personnel. The competition for such employees is intense.


OUR INTERNATIONAL BUSINESS OPERATIONS EXPOSE US TO A VARIETY OF BUSINESS RISKS

     Foreign sales are a significant part of our total revenues. The table below
sets forth, for the periods indicated, the dollar amount in millions of our
total revenues derived from our primary geographic markets.

                                       11
<PAGE>

<TABLE>
<CAPTION>
                                                                                 Six Months Ended
                                                 Year Ended December 31,              June 30,
                                             --------------------------------   -------------------
Country                                        1997         1998       1999             2000
-------                                      -------      --------   --------   -------------------
<S>                                         <C>           <C>         <C>        <C>
United States.......................         $18.1         $23.8      $50.3             $32.8
Israel..............................            .5           6.0        2.9               3.1
China...............................           1.8           7.2        2.4               5.4
Other Countries.....................           8.4           9.0       17.9              20.1
                                             -----         -----      -----             -----
  Total Revenues....................         $28.8         $46.0      $73.5             $61.4
</TABLE>

     We expect foreign sales to continue to account for a significant percentage
of our total revenues. A significant portion of our total revenues will
therefore be subject to risks associated with foreign sales, including the
following:

     .  Unexpected changes in legal and regulatory requirements and policy
        changes affecting the telecommunications and data communications
        markets.
     .  Changes in tariffs.
     .  Exchange rates and other barriers.
     .  Political and economic instability.
     .  Difficulties in accounts receivable collection.

     .  Difficulties in managing distributors and representatives.
     .  Difficulties in staffing and managing foreign operations.
     .  Difficulties in protecting our intellectual property overseas.
     .  Seasonality of customer buying patterns.
     .  Potentially adverse tax consequences.

     Although substantially all of our sales to date have been denominated in
U.S. dollars, the value of the U.S. dollar in relation to foreign currencies
also may reduce our sales to foreign customers. To the extent that we expand our
international operations or change our pricing practices to denominate prices in
foreign currencies, we will expose our margins to increased risks of currency
fluctuations.

RISKS RELATED TO OUR INDUSTRY

OUR SUCCESS DEPENDS ON THE CONTINUED GROWTH OF THE GLOBAL COMMUNICATIONS
INFRASTRUCTURE

     We derive virtually all of our product revenues from sales of products for
telecommunications and data communications applications. These markets are
characterized by the following:

     .  Susceptibility to seasonality of customer buying patterns.
     .  Intense competition.
     .  Rapid technological change.
     .  Short product life cycles.

     In addition, although the telecommunications and data communications
equipment markets have grown rapidly in the last few years, we cannot be certain
that these markets will continue to grow or that a significant slowdown in these
markets will not occur.

                                       12
<PAGE>


     Products for telecommunications and data communications applications are
based on industry standards, which are continually evolving. Our future success
will depend, in part, upon our ability to successfully develop and introduce new
products based on emerging industry standards, which could render our existing
products unmarketable or obsolete. If the telecommunications or data
communications markets evolve to new standards, we cannot be certain that we
will be able to design and manufacture new products successfully that address
the needs of our customers or that such new products will meet with substantial
market acceptance.

THE CYCLICALITY OF THE SEMICONDUCTOR INDUSTRY AFFECTS OUR BUSINESS

     We provide semiconductor devices to the telecommunications and data
communications markets. The semiconductor industry is highly cyclical and has
been subject to significant economic downturns at various times, characterized
by:

     .  Diminished product demand.
     .  Accelerated erosion of average selling prices.
     .  Production over-capacity.

     We may experience substantial fluctuations in future operating results due
to general semiconductor industry conditions, overall economic conditions,
seasonality of customers' buying patterns and other factors.

                        RISKS RELATED TO THIS OFFERING

OUR STOCK PRICE MAY BE VOLATILE, AND YOU MAY NOT BE ABLE TO RESELL YOUR SHARES
AT OR ABOVE THE OFFERING PRICE

     The market for securities of high technology companies, including our
company, has been highly volatile. The market sale price of our common stock has
fluctuated between $0.80 and $67.25 from June 19, 1995 to September 26, 2000 and
the last sale price was $63.75 on September 26, 2000 and it is likely that the
price of the common stock will continue to fluctuate widely in the future.
Factors affecting the trading price of our common stock include

     .  Responses to quarter-to-quarter variations in operating results.
     .  Announcements of technological innovations or new products by us or our
        competitors.
     .  General conditions in the telecommunications and data communications
        equipment markets.
     .  Changes in earnings estimates by analysts.


                                      13
<PAGE>

WE COULD BE SUBJECT TO CLASS ACTION LITIGATION DUE TO STOCK PRICE VOLATILITY,
WHICH IF IT OCCURS, WILL DISTRACT OUR MANAGEMENT AND COULD RESULT IN SUBSTANTIAL
COSTS OR LARGE JUDGMENTS AGAINST US

     In the past, securities and class action litigation has often been brought
against companies following periods of volatility in the market prices of their
securities. We may be the target of similar litigation in the future. Securities
litigation could result in substantial costs and divert our management's
attention and resources, which could cause serious harm to our business,
operating results and financial condition or dilution to our stockholders.


PROVISIONS OF OUR CERTIFICATE OF INCORPORATION, BY-LAWS AND DELAWARE LAW MAY
DISCOURAGE TAKEOVER OFFERS AND MAY LIMIT THE PRICE INVESTORS WOULD BE WILLING TO
PAY FOR OUR COMMON STOCK

     Delaware corporate law contains, and our certificate of incorporation and
by-laws contain, certain provisions that could have the effect of delaying,
deferring or preventing a change in control of our Company. These provisions
could limit the price that certain investors might be willing to pay in the
future for shares of our common stock. Certain of these provisions:

     .  Authorize the issuance of "blank check" preferred stock (preferred stock
        which our board of directors can create and issue without prior
        stockholder approval) with rights senior to those of common stock.
     .  Prohibit stockholder action by written consent.
     .  Establish advance notice requirements for submitting nominations for
        election to the board of directors and for proposing matters that can be
        acted upon by stockholders at a meeting.

                                       14
<PAGE>

                               USE OF PROCEEDS

     We will not receive any of the proceeds from the sale of our common stock
by the selling stockholders. The principal purpose of this offering is to effect
an orderly disposition of the selling stockholders' shares.

                             SELLING STOCKHOLDERS

     The following table sets forth the number of shares beneficially owned by
each of the selling stockholders as of September 25, 2000 and the number of
shares that may be offered by the selling stockholders pursuant to this
prospectus. We have assumed, when calculating the numbers in the table, that all
of the shares owned by each selling stockholder and offered pursuant to this
prospectus will be sold. An asterisk in the table means that the number is less
than 1%.

     As of September 25, 2000, there were 82,066,589 shares of common stock
outstanding.

<TABLE>
<CAPTION>

                                                                      Shares Offered
                                          Shares Owned                   Pursuant                  Shares Owned
                                        Before the Offering         to this Prospectus          After the Offering
                                        -------------------         ------------------          ------------------
      Selling Stockholders               Number     Percent         Number      Percent          Number     Percent
      --------------------               ------     -------         ------      -------          ------     -------
<S>                                     <C>         <C>             <C>         <C>             <C>         <C>
Bennett J. Bauer & Cynthia L.            1,394          *            1,394          *               0          *
Bauer
Robert D. Brownell                         386          *              386          *               0          *
Jim Cansler                              1,678          *            1,678          *               0          *
Thomas Cushing                           2,134          *            2,134          *               0          *
David Powell Incorporated                  244          *              244          *               0          *
Raymond Grefe                            1,220          *            1,220          *               0          *
Chang Sull Kang                            600          *              600          *               0          *
Allan Lin                                  610          *              610          *               0          *
Annie Liu                                2,442          *            2,442          *               0          *
Jiong Liu                                2,320          *            2,320          *               0          *
Zheng Liu                                9,768          *            9,768          *               0          *
Baoxing Tang                               476          *              476          *               0          *
Dennis Tsurumaki                            24          *               24          *               0          *
Raymond S. Venoski                          30          *               30          *               0          *
Raymond S. Venoski & Sara                1,148          *            1,148          *               0          *
Jo Light
WS Investment Company 96B                   28          *               28          *               0          *
Ming Wu                                    182          *              182          *               0          *
Linda Yang                               3,784          *            3,784          *               0          *
Jun Zhu                                    182          *              182          *               0          *
KLM Capital Partners Fund, L.P.         18,030          *           18,030          *               0          *
Lee Teck Seng                            5,744          *            5,744          *               0          *
</TABLE>

                                       15
<PAGE>

<TABLE>
<S>                                    <C>              <C>        <C>              <C>             <C>        <C>
Triophy Investments Ltd.               124,856          *          124,856          *               0          *
WS Investments                             720          *              720          *               0          *
Zheng Liu and Linda Yang                   832          *              832          *               0          *
Current Ventures Group, Ltd.            10,986          *           10,986          *               0          *
EDB Ventures Pte. Ltd.                  13,734          *           13,734          *               0          *
Technology Fund Pte. Ltd.               27,466          *           27,466          *               0          *
KLM Capital Management, Inc.             8,344          *            8,344          *               0          *
Dain Rauscher Wessels                    8,344          *            8,344          *               0          *
Current Ventures II, Ltd.               13,382          *           13,382          *               0          *
                                       -------          -          -------          -               -          -
Total                                  261,088          *          261,088          *               0          *
-----
</TABLE>

     The selling stockholders acquired their shares in connection with our
acquisition of Alacrity Communications, Inc., a California corporation, through
an agreement and plan of reorganization dated as of July 25, 2000. The
transaction was accounted for using the purchase method of accounting. In
connection with the acquisition, we entered into a registration rights agreement
with the Alacrity stockholders pursuant to which we agreed to register the
shares issued to them in connection with the transaction.

     The above table includes an aggregate of 26,866 shares of common stock
beneficially owned by the selling stockholders that have been deposited in an
escrow account pursuant to an escrow agreement dated as of August 1, 2000. The
escrowed shares will be used to indemnify TranSwitch against losses, if any,
resulting from breaches of the representations and warranties made by the
selling stockholders in the agreement and plan of reorganization. Escrowed
shares that are not needed to cover outstanding claims made by TranSwitch
will be released on July 31, 2001.

     Prior to our transaction with Alacrity, we had an ongoing business
relationship with Alacrity through which Alacrity provided development
assistance of high capacity VLSI switching devices to complement in-house
development done by TranSwitch. Each of the selling stockholders who was
employed by Alacrity is currently employed by us.

                             PLAN OF DISTRIBUTION

     The shares offered in this prospectus may be offered and sold from time to
time for the accounts of the selling stockholders, including donees,
transferees, pledgees, distributees or other successors in interest that receive
such shares as a gift or through another non-sale related transfer from the
selling stockholders.

     The selling stockholders will act independently of TranSwitch in making
decisions with respect to the timing, manner and size of any sale. The selling
stockholders may sell the shares:

     .  at then-prevailing prices and terms,
     .  at prices related to the then-current market price, or
     .  at negotiated prices.

                                       16
<PAGE>

     The sales may be made in the over-the-counter market, on the Nasdaq
National Market, or on any exchange on which the shares are listed. The selling
stockholders may sell the shares in one or more of the following types of
transactions:

     .  one or more block trades in which the broker or dealer will attempt to
        sell as agent or principal all or a portion of the shares held by the
        selling stockholder,
     .  purchases by a broker or dealer as principal and resale by such broker
        or dealer for its account pursuant to this prospectus,
     .  ordinary brokerage transactions and transactions in which a broker
        solicits purchasers,
     .  in negotiated transactions, or
     .  through other means.

     Subject to the restrictions imposed on them related to their employment by
us, the selling stockholders may enter into hedging transactions when selling
the shares. For example, the selling stockholders may

     .  sell shares short and redeliver such shares to close out their short
        positions,
     .  enter into transactions involving short sales by the brokers or dealers,
     .  enter into option or other types of transactions that require the
        selling stockholder to deliver shares to a broker or dealer, who then
        resells or transfer the shares under this prospectus, or
     .  loan or pledge the shares to a broker or dealer, who may sell the loaned
        shares or, in the event of default, sell the pledged shares.

     The selling stockholders may effect sales through brokers, dealers or
agents, who in turn may arrange for other brokers or dealers to participate. The
brokers, dealers or agents may receive discounts, concessions, commissions or
fees from the selling stockholders and/or purchasers of the shares in amounts to
be determined prior to the sale. Under the federal securities laws, these
brokers or dealers and any other participating brokers or dealers may be deemed
to be "underwriters" and any discounts, concessions or commissions received by
them may be deemed to be "underwriting compensation" under the Securities Act of
1933, as amended. Because the selling shareholders may be deemed to be
"underwriters" within the meaning of the Securities Act, the selling
shareholders will be subject to the prospectus delivery requirements of the
Securities Act.

     In addition to selling the shares, the selling stockholders may

     .  sell their shares under Rule 144 of the Securities Act, if the
        transaction meets the requirements of Rule 144,
     .  transfer the shares by gift, distribution or other transfer not
        involving market makers or established trading markets, and
     .  agree to indemnify any broker, dealer or agent that participates in
        transactions involving the sale of the shares against certain
        liabilities, including liabilities arising under the Securities Act.

                                       17
<PAGE>

     The selling stockholders are not subject to any underwriting agreement. The
selling stockholders, or any parties who receive the shares from the selling
stockholders by way of a gift, donation, distribution or other transfer, may
sell the shares covered by this prospectus.

     TranSwitch will pay all expenses incident to the offering and sale of the
shares to the public other than any discounts, concessions, commissions or fees
of underwriters, brokers, dealers or agents.

     Some states require that any shares sold in that state only be sold through
registered or licensed brokers or dealers. In addition, some states require that
the shares have been registered or qualified for sale in that state, or that
there exists an exemption from the registration or qualification requirements
and that the exemption has been complied with.

     We intend to maintain the effectiveness of this prospectus until August 1,
2001 or such period as is required to satisfy our obligations under the
registration rights agreement among the selling shareholders and us. We may
suspend the selling stockholders' rights to resell shares under this prospectus.

     We shall inform the selling stockholders that the anti-manipulation rules
of Regulation M under the Securities Exchange Act of 1934, as amended, may apply
to sales of shares in the market and to the activities of the selling
stockholders and their respective affiliates. In addition, we will make copies
of this prospectus available to each of the selling stockholders and shall
inform them of the need to deliver copies of this prospectus to purchasers at or
prior to the time of any sale of the shares.

     We will not receive any proceeds from this offering. The selling
stockholders will pay or assume brokerage commissions or other charges and
expenses incurred in the resale of the shares.

                                 LEGAL MATTERS

     The validity of the shares of common stock offered hereby will be passed
upon for the Company by Testa, Hurwitz & Thibeault, LLP, Boston, Massachusetts.
Richard J. Testa and Timothy C. Maguire, partners of the firm, beneficially own
12,676 and 1,800 shares of common stock of the Company, respectively.

                                       18
<PAGE>

                                    EXPERTS

     The consolidated financial statements of TranSwitch Corporation as of
December 31, 1999 and 1998, and for each of the years in the three-year period
ended December 31, 1999, are incorporated by reference in this prospectus and
registration statement, in reliance upon the reports of KPMG LLP, independent
certified public accountants, incorporated by reference herein, and upon the
authority of said firm as experts in accounting and auditing.

                      WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and current reports, proxy statements and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference room located at:

                                Judiciary Plaza
                                   Room 1024
                            450 Fifth Street, N.W.
                             Washington, DC 20549

     You can request copies of these documents by writing to the Public
Reference Section of the SEC, 450 Fifth Street, N.W., Washington, DC 20549 or by
calling the SEC at 1-800-SEC-0330. Our SEC filings are also available at the
SEC's web site at http://www.sec.gov. This web site address is included in this
document as an inactive textual reference only.

     The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this prospectus, and information that we file later
with the SEC will automatically update and supersede this information. We
incorporate by reference the documents listed below and any future filings we
will make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange
Act (File No. 0-25996):

     .  Annual report on Form 10-K for the year ended December 31, 1999
     .  Proxy statement, filed on April 13, 2000, for the 2000
        Annual Meeting of Shareholders
     .  Quarterly report on Form 10-Q for the quarter ended March 31, 2000
     .  Quarterly report on Form 10-Q for the quarter ended June 30, 2000
     .  Quarterly report on Form 10-Q/A for the quarter ended June 30, 2000
     .  Current report on Form 8-K dated May 23, 2000
     .  Current report on Form 8-K dated September 1, 2000
     .  Current report on Form 8-K dated September 11, 2000
     .  Current report on Form 8-K dated September 13, 2000
     .  Current report on Form 8-K dated September 25, 2000 and
     .  The "Description of Capital Stock" contained in TranSwitch's
        registration statement No. 00025996 on Form 8-A, dated April 28, 1995.

                                       19
<PAGE>

     You may request a copy of these filings, at no cost, by writing or
telephoning our Chief Financial Officer at the following address:

                         TranSwitch Corporation
                         3 Enterprise Drive
                         Shelton, Connecticut 06484
                         (203) 929-8810

     This information is part of a registration statement we filed with the SEC.
You should rely only on the information or representations provided in this
prospectus. We have authorized no one to provide you with different information.
We are not making an offer of these securities in any state where the offer is
not permitted. You should not assume that the information in this prospectus is
accurate as of any date other than the date on the front of the document.

                                       20
<PAGE>

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

     The following table sets forth an estimate of the expenses we expect to
incur and pay in connection with the issuance and distribution of the securities
being registered, other than underwriting compensation:

Registration Fee -- Securities and Exchange Commission..  $ 2,775.00

Accounting Fees and Expenses............................    5,000.00

Legal Fees and Expenses.................................    5,000.00

Transfer Agent Fees and Expenses........................    5,000.00

Miscellaneous...........................................    1,000.00

  TOTAL.................................................  $18,775.00


Item 15.  Indemnification of Directors and Officers.

     Section 145 of the Delaware General Corporation Law (DGCL) permits us to
indemnify our directors, officers, employees and agents against actual and
reasonable expenses (including attorneys' fees) incurred by them in connection
with any action, suit or proceeding brought against them by reason of their
status or service as a director, officer, employee or agent by or on our behalf
and against expenses (including attorneys' fees), judgments, fines and
settlements actually and reasonably incurred by him or her in connection with
any such action, suit or proceeding, if:

     . he or she acted in good faith and in a manner he or she reasonably
       believed to be in or not opposed to the best interests of TranSwitch and
     . in the case of a criminal proceeding, he or she had no reasonable cause
       to believe his or her conduct was unlawful.

     Except as ordered by a court, no indemnification shall be made in
connection with any proceeding brought by or in the right of the corporation
where the person involved is adjudged to be liable to us.

                                     II-1
<PAGE>

     Article Ten of our amended and restated certificate of incorporation, as
amended, contains provisions that eliminate a director's personal liability for
monetary damages resulting from a breach of fiduciary duty, except in certain
circumstances involving certain wrongful acts, such as the breach of a
director's duty of loyalty or acts or omissions which involve intentional
misconduct or a knowing violation of law. These provisions do not limit or
eliminate our rights or those of any stockholder to seek non-monetary relief,
such as an injunction or rescission, in the event of a breach of a director's
fiduciary duty. These provisions will not alter a director's liability under
federal securities laws. Our certificate of incorporation also contains
provisions indemnifying our directors and officers to the fullest extent
permitted by the DGCL.

     We maintain directors and officers liability insurance for the benefit of
our directors and certain of our officers.

     Our amended and restated by-laws contain no provisions relating to the
indemnification of officers and directors.

Item 16.  Exhibits.

     The following exhibits, required by Item 601 of Regulation S-K, are filed
as a part of this Registration Statement. Exhibit numbers, where applicable, in
the left column correspond to those of Item 601 of Regulation S-K.

Exhibit No.                        Item and Reference
-----------                        ------------------

   2.1   -- Agreement and Plan of Reorganization, dated July 25, 2000, by and
            among TranSwitch, TXC Acquisition Corporation and the Alacrity
            Stockholders (previously filed)

   2.2   -- Escrow Agreement, dated August 1, 2000, by and among TranSwitch, the
            Alacrity Stockholders and the other parties thereto (previously
            filed)

   4.1   -- Registration Rights Agreement, dated August 1, 2000, by and among
            TranSwitch and the Alacrity Stockholders (previously filed)

   4.2   -- Purchase Agreement, dated August 1, 2000, by and among TranSwitch,
            Alacrity, TXC Acquisition Corporation, Triophy Investments, Ltd. and
            Current Ventures II, Ltd. (previously filed)

   5.1   -- Legal Opinion of Testa, Hurwitz & Thibeault, LLP (previously filed)

   23.1  -- Consent of KPMG LLP (filed herewih)

   24.1  -- Power of Attorney (previously filed)

                                     II-2
<PAGE>

Item 17.  Undertakings.

     We hereby undertake:

     (1)  to file, during any period in which offers or sales are being made, a
          post-effective amendment to this registration statement:

          (i)    to include any prospectus required by Section 10(a)(3) of the
                 Securities Act;

          (ii)   to reflect in the prospectus any facts or events arising after
                 the effective date of the registration statement (or the most
                 recent post-effective amendment thereof) which, individually or
                 in the aggregate, represent a fundamental change in the
                 information set forth in the registration statement.
                 Notwithstanding the foregoing, any increase or decrease in
                 volume of securities offered (if the total dollar value of
                 securities offered would not exceed that which was registered)
                 and any deviation from the low or high end of the estimated
                 maximum offering range may be reflected in the form of
                 prospectus filed with the Commission pursuant to Rule 424(b)
                 if, in the aggregate, the changes in volume and price represent
                 no more than 20 percent change in the maximum aggregate
                 offering price set forth in the "Calculation of Registration
                 Fee" table in the effective registration statement.

          (iii)  to include any material information with respect to the plan of
                 distribution not pervasively disclosed in the registration
                 statement or any material change to such information in the
                 registration statement.

     (2)  that, for the purpose of determining liability under the Securities
          Act, each such post-effective amendment shall be deemed to be a new
          registration statement relating to the securities offered therein, and
          the offering of such securities at that time shall be deemed to the
          initial bona fide offering thereof.

     (3)  to remove from registration by means of a post-effective amendment any
          of the securities being registered which remain unsold at the
          termination of the offering.

     (4)  for purposes of determining any liability under the Securities Act,
          each filing of our annual report pursuant to Section 13(a) or 15(d) of
          the Exchange Act (and, where applicable, each filing of an employee
          benefit plan's annual report pursuant to Section 15(d) of the Exchange
          Act) that is incorporated by reference in the registration statement
          shall be deemed to be a new registration statement relating the
          securities offered therein, and the offering of such securities at
          that time shall be deemed to be the initial bona fide offering
          thereof.

     (5)  for purposes of determining any liability under the Securities Act,
          the information omitted from the form of prospectus filed as a part of
          this registration statement in reliance upon Rule 430A and contained
          in a form of prospectus filed by us pursuant to

                                     II-3
<PAGE>

          Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be
          deemed to be part of this registration statement as of the time it was
          declared effective.

     (6)  for the purpose of determining any liability under the Securities Act,
          each post-effective amendment that contains a form of prospectus shall
          be deemed to be a new registration statement relating to the
          securities offered therein, and the offering of such securities at
          that time shall be deemed to be the initial bona fide offering
          thereto.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of TranSwitch
pursuant to the foregoing provisions, or otherwise, TranSwitch has been advised
that in the opinion of the SEC such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, TranSwitch will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

                                     II-4
<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, we certify that
we have reasonable grounds to believe that we meet all of the requirements for
filing on Form S-3 and have duly caused this registration statement to be signed
on our behalf by the undersigned, thereunto duly authorized in the City of
Shelton, State of Connecticut on September 27, 2000.

                                    TranSwitch Corporation


                                    By: /s/ Michael F. Stauff
                                        ---------------------
                                        Senior Vice President, Chief Financial
                                          Officer & Treasurer


                                  Power of Attorney

     Each person whose signature appears below on this registration statement
hereby constitutes and appoints Dr. Santanu Das and Michael F. Stauff and each
of them, with full power to act without the other, his true and lawful attorney-
in-fact and agent, with full power of substitution and resubstitution, for him
and in his name, place and stead, in any and all capacities (until revoked in
writing) to sign any and all amendments (including post-effective amendments and
amendments thereto) to this registration statement of TranSwitch Corporation,
and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary fully to all
intents and purposes as he might or could do in person thereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons on behalf
of the Registrant and in the capacities and on the dates indicated.

Name                        Capacity                          Date
----                        --------                          ----

/s/ Santanu Das             President, Chief Executive        September 27, 2000
---------------             Officer and Chairman of the
Dr. Santanu Das             Board of Directors


/s/ Michael F. Stauff       Senior Vice President, Chief      September 27, 2000
---------------------       Financial Officer and Treasurer
Michael F. Stauff

                                     II-5
<PAGE>

/s/ Alfred R. Boschulte*    Director                          September 27, 2000
-----------------------
Alfred R. Boschulte


/s/ Ljubomir Micic*         Director                          September 27, 2000
------------------
Dr. Ljubomir Micic


/s/ Gerald F. Montry*       Director                          September 27, 2000
--------------------
Gerald F. Montry


/s/ James M. Pagos*         Director                          September 27, 2000
------------------
James M. Pagos


/s/ Albert E. Paladino*     Director                          September 27, 2000
----------------------
Dr. Albert E. Paladino


/s/ Erik H. van der Kaay*   Director                          September 27, 2000
------------------------
Erik H. van der Kaay


*By: /s/ Michael F. Stauff
    ------------------------
     Michael F. Stauff
     Attorney-in-Fact
                                     II-6
<PAGE>

                               INDEX TO EXHIBITS

Exhibit
Number                       Description of Exhibit
------                       ----------------------

  2.1   --   Agreement and Plan of Reorganization, dated July 25, 2000, by and
             among TranSwitch, TXC Acquisition Corporation and the Alacrity
             Stockholders (previously filed)

  2.2   --   Escrow Agreement, dated August 1, 2000, by and among TranSwitch,
             the Alacrity Stockholders and the other parties thereto (previously
             filed)

  4.1   --   Registration Rights Agreement, dated August 1, 2000, by and among
             TranSwitch and the Alacrity Stockholders (previously filed)

  4.2   --   Purchase Agreement, dated August 1, 2000, by and among TranSwitch,
             Alacrity, TXC Acquisition Corporation, Triophy Investments, Ltd.
             and Current Ventures II, Ltd. (previously filed)

  5.1   --   Legal Opinion of Testa, Hurwitz & Thibeault, LLP (previously filed)

  23.1  --   Consent of KPMG LLP (filed herewith)

  24.1  --   Power of Attorney (previously filed)


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