<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS FOR THE THREE MONTHS ENDED JUNE 30, 1998 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             APR-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                           6,280
<SECURITIES>                                    81,735
<RECEIVABLES>                                   22,298
<ALLOWANCES>                                     1,066
<INVENTORY>                                     22,799
<CURRENT-ASSETS>                               144,056
<PP&E>                                          22,212
<DEPRECIATION>                                  11,079
<TOTAL-ASSETS>                                 157,171
<CURRENT-LIABILITIES>                           24,678
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       116,461
<OTHER-SE>                                      16,032
<TOTAL-LIABILITY-AND-EQUITY>                   157,171
<SALES>                                         34,073
<TOTAL-REVENUES>                                34,073
<CGS>                                           17,603
<TOTAL-COSTS>                                   17,603
<OTHER-EXPENSES>                                14,558
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  17
<INCOME-PRETAX>                                  2,463
<INCOME-TAX>                                       887
<INCOME-CONTINUING>                              1,576
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,576
<EPS-PRIMARY>                                     0.13
<EPS-DILUTED>                                     0.12