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<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

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<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>UNITED STATES </B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Washington, D.C. 20549 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>FORM 8-K </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>CURRENT REPORT </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Pursuant to Section 13 or 15(d) of The Securities
Exchange Act of 1934 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Date of Report (Date of earliest event reported):
January 26, 2012</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 24pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>MICROSEMI CORPORATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>(Exact name of registrant as specified in
its charter) </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD STYLE="width: 33%">&nbsp;</TD>
    <TD STYLE="width: 2%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 31%">&nbsp;</TD>
    <TD STYLE="width: 2%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 32%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">Delaware</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">0-8866</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">95-2110371</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>(State or other jurisdiction</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0.75pt; text-align: center"><B>of incorporation)</B></P></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(Commission File Number)</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>(IRS Employer</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0.75pt; text-align: center"><B>Identification No.)</B></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD STYLE="width: 48%">&nbsp;</TD>
    <TD STYLE="width: 5%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 47%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">One Enterprise, Aliso Viejo, California</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">92656</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(Address of principal executive offices)</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(Zip Code)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Registrant&rsquo;s telephone number, including
area code </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>(949) 380-6100&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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    <TD STYLE="width: 4%; font-family: Wingdings">&uml;</TD>
    <TD>Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 4%; font-family: Wingdings">&uml;</TD>
    <TD>Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 4%; font-family: Wingdings">&uml;</TD>
    <TD>Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 4%; font-family: Wingdings">&uml;</TD>
    <TD>Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">INFORMATION TO BE INCLUDED IN THE REPORT</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;<B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Item 2.02 Results of Operations and Financial Condition. </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">On January 26, 2012 the Registrant issued a press release, a copy
of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Item 9.01 Financial Statements and Exhibits.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

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    <TD>&nbsp;</TD>
    <TD STYLE="width: 5%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 83%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom; border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Exhibit&nbsp;No.</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P></TD>
    <TD STYLE="vertical-align: bottom"></TD>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Description</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">99.1</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Press release dated January 26, 2012</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SIGNATURES </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 24.5pt">Pursuant to the requirements of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 50%">MICROSEMI CORPORATION</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>(Registrant)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>Date:&nbsp; January 26, 2012</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-decoration: underline">/s/ JOHN W. HOHENER</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>John W. Hohener</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Executive Vice President,</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Chief Financial Officer,</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Treasurer and Secretary</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 12pt; text-indent: -12pt">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>EXHIBIT INDEX </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD>&nbsp;</TD>
    <TD STYLE="width: 5%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 83%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom; border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Exhibit&nbsp;No.</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P></TD>
    <TD STYLE="vertical-align: bottom"></TD>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Description</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">99.1</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Press release dated January 26, 2012</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><B></B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>



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{"company-data": {"conformed-name": "MICROSEMI CORP", "cik": "0000310568", "assigned-sic": "3674", "irs-number": "952110371", "state-of-incorporation": "DE", "fiscal-year-end": "1002"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-08866", "film-number": "12547782"}, "business-address": {"street1": "ONE ENTERPRISE", "city": "ALISO VIEJO", "state": "CA", "zip": "92656", "phone": "949-380-6100"}, "mail-address": {"street1": "ONE ENTERPRISE", "city": "ALISO VIEJO", "state": "CA", "zip": "92656"}, "former-company": {"former-conformed-name": "MICROSEMICONDUCTOR CORP", "date-changed": "19830323"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of The Securities
Exchange Act of 1934
Date of Report (Date of earliest event reported):
January 26, 2012
MICROSEMI CORPORATION
(Exact name of registrant as specified in
its charter)
Delaware
0-8866
95-2110371
(State or other jurisdiction
of incorporation)
(Commission File Number)
(IRS Employer
Identification No.)
One Enterprise, Aliso Viejo, California
92656
(Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including
area code
(949) 380-6100
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
¨
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
INFORMATION TO BE INCLUDED IN THE REPORT
Item 2.02 Results of Operations and Financial Condition.
On January 26, 2012 the Registrant issued a press release, a copy
of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.
Item 9.01 Financial Statements and Exhibits.
Exhibit No.
Description
99.1
Press release dated January 26, 2012
SIGNATURES
Pursuant to the requirements of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
MICROSEMI CORPORATION
(Registrant)
Date:  January 26, 2012
/s/ JOHN W. HOHENER
John W. Hohener
Executive Vice President,
Chief Financial Officer,
Treasurer and Secretary
EXHIBIT INDEX
Exhibit No.
Description
99.1
Press release dated January 26, 2012