Exhibit 31.2


Certifications Under Rule 13a-14(a)/l5d-14(a)





I, Phillip A. Kagel, certify that:





1.      I have reviewed this quarterly report on Form 10-Q of Supertex, Inc., a California corporation;





2.      Based on my knowledge, this quarterly 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 quarterly report;





3.      Based on my knowledge, the financial statements, and other financial information included in this quarterly 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 quarterly 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 Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and I 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 me by others within those entities, particularly during the period in which this quarterly report is being prepared;





(b)   designed such internal control over financial reporting, or caused such internal control over financial reporting 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 GAAP;





(c)       evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusion about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report
based on such evaluation; and





(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 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
data and have identified for the registrant's auditors any material weaknesses in internal controls; and





(b)       any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal controlover financial reporting.





Dated:  August 5, 2009


/s/PHILLIP A. KAGELPhillip A. KagelVice President, Finance and Chief Financial Officer(Principal Financial and Accounting Officer)