Identifying Power Semiconductor
Image
Thought for 32 sec
This looks like a TO-3P/TO-247-class power semiconductor mounted to a heatsink. For a JPG attachment like this, the useful first step is to inspect the visible package style and printed markings directly .
From the photo, the clearest marking I can make out is:
- FJA 55N25
- F13 G29
- There also appears to be a small circular A mark
Most likely, this is a high-power transistor-class device such as a MOSFET or IGBT, but I can’t confirm the exact part type from this photo alone because the top device marking is too faint and the manufacturer logo isn’t fully readable.
If you want, I can help with either of these next:
- identify the exact part number from a sharper photo of just the device face
- find the datasheet/pinout for FJA55N25
- figure out whether it’s an MOSFET, IGBT, or BJT from the circuit it came from
Find FJA55N25 datasheet
Identify package type
Read faint top marking
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