EXHIBIT
31
 Certification
of Chief Executive Officer
 Pursuant
to Section 302 of the Sarbanes-Oxley Act of 2002
 
 I,
Raymond D. Zinn, certify that:
 
 1.             I
have reviewed this quarterly report on Form 10-Q of Micrel,
Incorporated;
 
 2.             Based
on my knowledge, this report does not contain any untrue statement of a material
fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading
with respect to the period covered by this report;
 
 3.             Based
on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and
for, the periods presented in this report;
 
 4.             The
registrant’s other certifying officer and I are responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
defined in the Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant
and have:
 
 a)                designed
such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material
information relating to the registrant, including its consolidated subsidiaries,
is made known to us by others within those entities, particularly during the
period in which this report is being prepared;
 
 b)                designed
such internal control over financial reporting, or caused such internal control
over financial control to be designed under our supervision, to provide
reasonable assurance regarding the reliability of financial reporting and the
preparation of financial statements for external purposes in accordance with
generally accepted accounting principles;
 
 c)                evaluated
the effectiveness of the registrant’s disclosure controls and procedures and
presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this
report based on such evaluation;
 
 d)               disclosed in this report
any change in the registrant’s internal control over financial reporting that
occurred during the registrant’s most recent fiscal quarter (the registrant’s
fourth fiscal quarter in the case of an annual report) that has materially
affected, or is reasonably likely to materially affect, the registrant’s
internal control over financial reporting; and
 
 5.             The
registrant’s other certifying officer and I have disclosed, based on our most
recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the audit committee of registrant’s board of directors
(or persons performing the equivalent function):
 
 a)                all
significant deficiencies and material weaknesses in the design or operation of
internal control over financial reporting which are reasonably likely to
adversely affect the registrant’s ability to record, process, summarize and
report financial information; and
 
 b)                any
fraud, whether or not material, that involves management or other employees who
have a significant role in the registrant’s internal control over financial
reporting.
 
 Date:
      May 9, 2008
              By          /s/ Raymond D.
      ZinnRaymond D. ZinnPresident, Chief Executive
      Officer and Director(Principal Executive
      Officer)
  
  Certification
of Chief Financial Officer
 Pursuant
to Section 302 of the Sarbanes-Oxley Act of 2002
 
 I,
Richard D. Crowley, Jr. certify that:
 
 1.             I
have reviewed this quarterly report on Form 10-Q of Micrel,
Incorporated;
 
 2.             Based
on my knowledge, this report does not contain any untrue statement of a material
fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading
with respect to the period covered by this report;
 
 3.             Based
on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and
for, the periods presented in this report;
 
 4.             The
registrant’s other certifying officer and I are responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
defined in the Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant
and have:
 
 a)                designed
such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to ensure that material
information relating to the registrant, including its consolidated subsidiaries,
is made known to us by others within those entities, particularly during the
period in which this report is being prepared;
 
 b)                designed
such internal control over financial reporting, or caused such internal control
over financial control to be designed under our supervision, to provide
reasonable assurance regarding the reliability of financial reporting and the
preparation of financial statements for external purposes in accordance with
generally accepted accounting principles;
 
 c)                evaluated
the effectiveness of the registrant’s disclosure controls and procedures and
presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this
report based on such evaluation;
 
 d)                
disclosed in this report any change in the registrant’s internal control over
financial reporting that occurred during the registrant’s most recent fiscal
quarter (the registrant’s fourth fiscal quarter in the case of an annual report)
that has materially affected, or is reasonably likely to materially affect, the
registrant’s internal control over financial reporting; and
 
 5.             The
registrant’s other certifying officer and I have disclosed, based on our most
recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the audit committee of registrant’s board of directors
(or persons performing the equivalent function):
 
 a)                all
significant deficiencies and material weaknesses in the design or operation of
internal control over financial reporting which are reasonably likely to
adversely affect the registrant’s ability to record, process, summarize and
report financial information; and
 
 b)                any
fraud, whether or not material, that involves management or other employees who
have a significant role in the registrant’s internal control over financial
reporting.
 
 Date:
      May 9, 2008
              By           /s/ Richard D.
      Crowley, Jr.Richard D. Crowley,
      Jr.Vice President, Finance
      andChief Financial
      Officer(Principal Financial and
      Accounting Officer)