There are several components that use that code but it's likely an MPSA42. The following link will help you to determine the part number of various SMD semiconductors. If you lose this link, search for 'SMD codebook' with google and it will likely be the first link.
http://www.tkb-4u.com/code/smdcode/indexsmdcode.php
http://www.tkb-4u.com/code/smdcode/indexsmdcode.php
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