Heat Sink for Mounting 1 Plastic Power Type (TO3P, TO126, TO127, TO202, TO218, TO220)
 
The NTE403 is a lightweight, channel style heat sink with a wide mounting surface for plastic power semiconductors. This device accommodates a single device and is excellent for circuit board applications.
 
Full spec sheet:
https://www.nteinc.com/specs/400to499/pdf/nte403.pdf