<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   3-MOS
<FISCAL-YEAR-END>                          JUL-31-1998             JUL-31-1998
<PERIOD-START>                             AUG-01-1997             FEB-01-1998
<PERIOD-END>                               APR-30-1998             APR-30-1998
<CASH>                                           4,901                   4,901
<SECURITIES>                                    20,251                  20,251
<RECEIVABLES>                                   12,471                  12,471
<ALLOWANCES>                                       543                     543
<INVENTORY>                                      7,719                   7,719
<CURRENT-ASSETS>                                46,302                  46,302
<PP&E>                                           6,037                   6,037
<DEPRECIATION>                                   4,736                   4,736
<TOTAL-ASSETS>                                  47,776                  47,776
<CURRENT-LIABILITIES>                            6,678                   6,678
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                             9                       9
<OTHER-SE>                                      41,089                  41,089
<TOTAL-LIABILITY-AND-EQUITY>                    47,776                  47,776
<SALES>                                         34,862                  10,558
<TOTAL-REVENUES>                                34,862                  10,558
<CGS>                                           28,902                   8,516
<TOTAL-COSTS>                                   28,902                   8,516
<OTHER-EXPENSES>                                 9,118                   2,363
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                (2,217)                      87
<INCOME-TAX>                                       572                      67
<INCOME-CONTINUING>                            (2,789)                      20
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (2,789)                      20
<EPS-PRIMARY>                                   (0.46)<F1>                0.00<F1>
<EPS-DILUTED>                                   (0.46)                    0.00
<FN>
<F1>EPS-PRIMARY IS EQUAL TO EPS-BASIC
</FN>
        

</TABLE>