<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AND INCOME STATEMENT OF TYCO INTERNATIONAL LTD. AS OF AND FOR THE NINE
MONTHS ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> SEP-30-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> JUN-30-2000
<EXCHANGE-RATE> 1
<CASH> 1,180,300
<SECURITIES> 0
<RECEIVABLES> 5,604,282
<ALLOWANCES> 413,300
<INVENTORY> 3,667,600
<CURRENT-ASSETS> 11,850,100
<PP&E> 14,147,000
<DEPRECIATION> 6,084,600
<TOTAL-ASSETS> 37,882,900
<CURRENT-LIABILITIES> 10,120,400
<BONDS> 10,403,200
0
0
<COMMON> 337,500
<OTHER-SE> 15,044,200
<TOTAL-LIABILITY-AND-EQUITY> 37,882,900
<SALES> 21,126,500
<TOTAL-REVENUES> 21,126,500
<CGS> 13,197,000
<TOTAL-COSTS> 13,197,000
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 22,348
<INTEREST-EXPENSE> 618,500
<INCOME-PRETAX> 3,488,900
<INCOME-TAX> 878,900
<INCOME-CONTINUING> 2,610,000
<DISCONTINUED> 0
<EXTRAORDINARY> (200)
<CHANGES> 0
<NET-INCOME> 2,609,800
<EPS-BASIC> 1.55
<EPS-DILUTED> 1.52
</TABLE>