<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AS OF AND FOR THE
QUARTER ENDED DECEMBER 31, 1997
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-START>                             OCT-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           9,923
<SECURITIES>                                    26,307
<RECEIVABLES>                                   10,879
<ALLOWANCES>                                     (350)
<INVENTORY>                                      8,002
<CURRENT-ASSETS>                                57,522
<PP&E>                                          45,623
<DEPRECIATION>                                (30,196)
<TOTAL-ASSETS>                                  73,857
<CURRENT-LIABILITIES>                           12,827
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0  
<PREFERRED>                                          0
<COMMON>                                           208
<OTHER-SE>                                      59,147
<TOTAL-LIABILITY-AND-EQUITY>                    73,857
<SALES>                                         19,666
<TOTAL-REVENUES>                                19,666
<CGS>                                            8,836
<TOTAL-COSTS>                                    8,836
<OTHER-EXPENSES>                                 6,864
<LOSS-PROVISION>                                     3
<INTEREST-EXPENSE>                                 143
<INCOME-PRETAX>                                  4,106
<INCOME-TAX>                                       103
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,003
<EPS-PRIMARY>                                     0.22
<EPS-DILUTED>                                     0.20