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Associate
January 26, 2026
Solved

Identify this part?

  • January 26, 2026
  • 9 replies
  • 999 views

Edited to place the image in the post - for easier viewing.


Hello,
This is my first time posting.
I am trying to find the P/N from the part's marking.
If you know it, please let me know.

Engraving: GP229

Guess: Schottky barrier diode STPS2L60 - 2A, 60V. Is that correct...?

If you have any information, please let me know. Thank you.

 

AndrewNeil_0-1769438378563.jpeg

 

Best answer by CXTURBO

Sorry for the late reply.
I obtained two candidate types and made a decision.
In the end, it appears that STTH112 was the correct answer.
STTH112 does not conduct current even at 1KV or reverse voltage, but STTH102 did.
Now I can install it with confidence.
Thank you for your advice.

9 replies

AScha.3
Super User
January 26, 2026

Hi,

marking could be ... GU

AScha3_0-1769416008969.png

Look, what it should do probably in the board : diode or ESD protection ?

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CXTURBOAuthor
Associate
January 27, 2026

Thank you for getting in touch.
I repair faulty power supplies, circuit boards, etc. that are entrusted to me by customers.
In this case, I needed this diode to repair an AC servo driver.
As I don't have a circuit diagram, I don't know its purpose (protection, ESD, etc.).
I plan to create a circuit diagram depending on the situation, but I was in a difficult situation as I couldn't install an uncertain part.
Is it likely that the SM6T200A mentioned in your comments is the P/N?
Also, is there a way to identify the P/N from the engraving?
Thank you in advance.

 

Please excuse any strange notation as I am using Japanese translation software.

CXTURBOAuthor
Associate
January 27, 2026

I'm sorry I don't really understand how to use it.
Regarding the STTH102/112, as advised by Peter, I'd like to remove the parts and measure them.
I'll comment once I've finished checking.
Thank you in advance.

Peter BENSCH
ST Technical Moderator
January 26, 2026

Welcome @CXTURBO , to the community!

You'll find the marking in the 2nd line, i.e. U12.

Unfortunately, the marking is ambiguous and could refer to either STTH102 (Utrafast 200V) or STTH112 (Utrafast 1.2kV) , which differ significantly from the blocking voltage and the forward voltage. For a successful replacement, you should therefore try to find out what the maximum voltage can be.

Regards
/Peter

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