**Exhibit 31.2**

 

Section 302(a) of the Sarbanes-Oxley Act of 2002

 

I, Joel S. Hatlen, certify that:

 

| 1) | I have reviewed this quarterly report on Form 10-Q of Data I/O Corporation; |
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| 2) | Based upon my knowledge, this report does not contain any untrue statement of 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; |
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| 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; |
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| 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 have: |
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|   | 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; |
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|   | 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 purpose in accordance with generally accepted accounting principles; |
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|   | c) | Evaluated the  effectiveness of the  registrant’s  disclosure  controls andprocedures  and  presented  in this    report  our  conclusions  about theeffectiveness  of the disclosure  controls and procedures,  as of the end of theperiod  covered by this  report based on such  evaluation;  and |
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|   | 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. |
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| 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 functions): |
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|   | 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 |
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|   | b) | any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting. |
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Date: August 13, 2008  

 

|   | /s/ Joel S. Hatlen |
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