<ARTICLE> 5
<RESTATED><F1> 
<CIK> 0000751978
<NAME> VICOR CORPORATION
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                          80,843
<SECURITIES>                                         0
<RECEIVABLES>                                   30,142
<ALLOWANCES>                                         0
<INVENTORY>                                     19,777
<CURRENT-ASSETS>                               133,652
<PP&E>                                         107,761
<DEPRECIATION>                                  45,859
<TOTAL-ASSETS>                                 207,302
<CURRENT-LIABILITIES>                           16,203
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           458
<OTHER-SE>                                     188,933
<TOTAL-LIABILITY-AND-EQUITY>                   207,302
<SALES>                                         77,657
<TOTAL-REVENUES>                                77,657
<CGS>                                           37,179
<TOTAL-COSTS>                                   37,179
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 19,280
<INCOME-TAX>                                     6,941
<INCOME-CONTINUING>                             12,339
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    12,339
<EPS-PRIMARY>                                      .29
<EPS-DILUTED>                                      .29
<FN>
<F1>Restated QTR 2, 1997 EPS to reflect adoption of FAS 128
</FN>