<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AS OF AND FOR THE SIX
MONTHS ENDED SEPTEMBER 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             APR-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                           6,431
<SECURITIES>                                    60,330
<RECEIVABLES>                                   17,919
<ALLOWANCES>                                     (337)
<INVENTORY>                                      9,450
<CURRENT-ASSETS>                               100,047
<PP&E>                                          21,141
<DEPRECIATION>                                   3,311
<TOTAL-ASSETS>                                 123,249
<CURRENT-LIABILITIES>                           14,972
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           232
<OTHER-SE>                                     104,240
<TOTAL-LIABILITY-AND-EQUITY>                   104,472
<SALES>                                         48,783
<TOTAL-REVENUES>                                48,783
<CGS>                                         (18,746)
<TOTAL-COSTS>                                 (36,457)
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,643
<INCOME-PRETAX>                                 13,969
<INCOME-TAX>                                   (5,028)
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     8,941
<EPS-PRIMARY>                                   22,277
<EPS-DILUTED>                                   24,538