EXHIBIT 31.2

# Section 302 Certification

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
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;
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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)) 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) |  | 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; and
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| | c) |  | 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
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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 the 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 control over
          financial reporting.
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|Date:  August 14, 2006 | /s/ JOEL S. HATLEN                         
_____________________________________
 Joel S. Hatlen                             
 Vice President and Chief Financial Officer 
 (Principal Financial Officer)
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