<TABLE> <S> <C>
<ARTICLE> 5
<CIK> 0000090283
<NAME> SILICONIX INC
<MULTIPLIER> 1,000
<CURRENCY> U.S. Dollars
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUL-02-2000
<EXCHANGE-RATE> 1.00
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<SECURITIES> 0
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<INVENTORY> 51,775
<CURRENT-ASSETS> 268,047
<PP&E> 354,918
<DEPRECIATION> 197,847
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<CURRENT-LIABILITIES> 146,517
<BONDS> 0
0
0
<COMMON> 299
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<SALES> 234,802
<TOTAL-REVENUES> 234,802
<CGS> 126,452
<TOTAL-COSTS> 126,452
<OTHER-EXPENSES> 39,432
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 1,977
<INCOME-PRETAX> 70,895
<INCOME-TAX> 16,242
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<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 54,535
<EPS-BASIC> 1.83
<EPS-DILUTED> 1.83
</TABLE>