<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS OF ALPHA INDUSTRIES, INC. AND SUBSIDIARIES AS OF AND FOR
THE SIX MONTHS ENDED SEPTEMBER 28, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS. THIS SCHEDULE HAS BEEN UPDATED TO
REFLECT THE ADOPTION OF FINANCIAL ACCOUNTING STANDARDS BOARD STATEMENT NO. 128
"EARNINGS PER SHARE".
</LEGEND>
<RESTATED>
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAR-29-1998
<PERIOD-START>                             MAR-30-1997
<PERIOD-END>                               SEP-28-1997
<CASH>                                           7,129
<SECURITIES>                                     1,234
<RECEIVABLES>                                   19,524
<ALLOWANCES>                                       588
<INVENTORY>                                      9,149
<CURRENT-ASSETS>                                38,129
<PP&E>                                          87,641
<DEPRECIATION>                                  29,882
<TOTAL-ASSETS>                                  69,567
<CURRENT-LIABILITIES>                           18,013
<BONDS>                                          2,580
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         2,590
<OTHER-SE>                                      45,059
<TOTAL-LIABILITY-AND-EQUITY>                    69,567
<SALES>                                         54,276
<TOTAL-REVENUES>                                54,276
<CGS>                                           34,750
<TOTAL-COSTS>                                   50,266
<OTHER-EXPENSES>                                    32
<LOSS-PROVISION>                                   120
<INTEREST-EXPENSE>                                 140
<INCOME-PRETAX>                                  3,838
<INCOME-TAX>                                       384
<INCOME-CONTINUING>                              3,454
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,454
<EPS-PRIMARY>                                     0.34
<EPS-DILUTED>                                     0.34