what is this transistor please

[electrolust]

only finding 2n5671 in TO-220 or bottlecap package. this looks to be TO-92.

this is from an automotive electtronic diff controller, +12v input to the board.

[wraper]

This looks like Japanese stuff from 80's or 90's

[wasedadoc]

If Japanese it could be 2SC5671.  I did find that number  in a list of Panasonic discontinued items. http://www.rf-china.com/pdffile/panasonic.pdf page 130.  Have not been able to find specs.

[Kim Christensen]

It's a bit blurry... But I see a S & G on the silkscreen. So it's probably a mosfet of some sort.

[rsjsouza]

only finding 2n5671 in TO-220 or bottlecap package. this looks to be TO-92.

This is a TO-226 package used in higher power transistors.
https://eesemi.com/to226.htm

The code 2SC5671 returns a lot of brokers but no significant specifications data, unfortunately. The markings on the PCB indeed hint to a FET, but it could be a JFET instead of a MOSFET. This packaging  is not as popular today as it was in the era where JFETs were all the rage.
Good luck finding additional info.

[BrokenYugo]

Since there appears to be more than one on the board perhaps a good one could be removed for testing? Confirm MOSFET, N or P channel,  enhancement/depletion, get the gate threshold voltage, and get an idea of what it does in circuit, something close enough (or sufficiently overkill) can probably be selected from there.

If 2SC5671 is the number all I could find in hard data is it listed in a discontinued devices section of an old Panasonic transistor catalog.

EDIT:Wait, if FET then wouldn't it be 2SK (N type) or 2SJ (P type), not 2SC?

2SJ567 is a P channel enhancement MOSFET, closest I could come up with. https://toshiba.semicon-storage.com/info/2SJ567_datasheet_en_20100205.pdf?did=12987&prodName=2SJ567

[electrolust]

This is japanese, 80s/90s. I found this available in SOT-323 package, $3.00. I guess I could just wire it in on the back side if I can't find it in the same package. I'll remove a good one and see what I can learn about it.

[electrolust]

BTW it got fried from reverse polarity

[fzabkar]

Automotive parts often have customer part numbers rather than IC manufacturer's numbers. What I find suspicious is that there is no J or K to tell us whether the part is N-channel or P-channel. This leads me to suspect that the part number is the customer's own.