<TABLE> <S> <C>
<ARTICLE> 5
<CIK> 0000090283
<NAME> SILICONIX INC
<MULTIPLIER> 1,000
<CURRENCY> U.S. Dollars
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-1-2000
<PERIOD-END> OCT-1-2000
<EXCHANGE-RATE> 1.00
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<SECURITIES> 0
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<PP&E> 369,928
<DEPRECIATION> 204,377
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<BONDS> 0
0
0
<COMMON> 299
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<SALES> 361,540
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<CGS> 195,388
<TOTAL-COSTS> 195,388
<OTHER-EXPENSES> 57,329
<LOSS-PROVISION> 0
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<INCOME-PRETAX> 108,823
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<NET-INCOME> 83,873
<EPS-BASIC> 2.81
<EPS-DILUTED> 2.81
</TABLE>