The part is still active, as @Community member noted, so moved from Discontinued Products to Power Management.
Regards
/Peter
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Please check again whether the marking is really 80NF03 - 04@, or maybe 80NF03L-04@, i.e. with the letter L after 03?
If you have a TO-220, then it's the former STP80NF03L-04, whose MOSFET chip inside is essentially identical to the D2PAK variant.
Regards
/Peter
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