Help IDing part: TSSOP8, top mark "MHJ"

Evan Shultz · 20th November 2010, 11:03 PM

I guess that says it all. I'd like to figure out what part I'm looking at.

Pin 4 is tied to ground and pin 8 is tied to +5V, so it could be a logic IC?? There aren't obvious feedback and/or input resistors so I'm doubting it's a comparator/opamp.

jitter · 21st November 2010, 10:41 AM

Might help to have some more info, like in what kind of circuit is it used?

Evan Shultz · 27th November 2010, 04:46 AM

Well, that's the problem. This TSSOP8 is in a SMPS, but I don't know what's going on since I can't ID this part.

And I've got another one: SOT23-6, marking is "252Y". It's in a SMPS too... maybe a pair of transistors or a voltage regulator??

jitter · 27th November 2010, 08:02 AM

I googled MHJ+TSSOP and most results pointed in the direction of a switching voltage regulator, so I wasn't surprised at your reply. But that's about as specific as I can be.
All the results were almost exclusively on Chinese websites. Your SMPS is it "made in China"?

Evan Shultz · 7th December 2010, 06:43 AM

I don't know if it was made in China or not. It's probably a good guess.

I Googled the same thing and see the "MHJ" in the part number on many Chinese sites. But I didn't see "MHJ" as the top mark. So I'm no closer. Did you see something I didn't?

How can I find a seemingly random IC from the top mark? Between NXP's and Fairchild's websites, and a couple other top mark listing sites, I can often figure out discrete components. But as for ICs... what to do?

Perhaps the part marked "252" is an IC which is why I'm having trouble IDing it??

20th November 2010, 11:03 PM	#1
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	Help IDing part: TSSOP8, top mark "MHJ" I guess that says it all. I'd like to figure out what part I'm looking at. Pin 4 is tied to ground and pin 8 is tied to +5V, so it could be a logic IC?? There aren't obvious feedback and/or input resistors so I'm doubting it's a comparator/opamp.

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21st November 2010, 10:41 AM	#2
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	Might help to have some more info, like in what kind of circuit is it used?

27th November 2010, 04:46 AM	#3
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	Well, that's the problem. This TSSOP8 is in a SMPS, but I don't know what's going on since I can't ID this part. And I've got another one: SOT23-6, marking is "252Y". It's in a SMPS too... maybe a pair of transistors or a voltage regulator??

27th November 2010, 08:02 AM	#4
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	I googled MHJ+TSSOP and most results pointed in the direction of a switching voltage regulator, so I wasn't surprised at your reply. But that's about as specific as I can be. All the results were almost exclusively on Chinese websites. Your SMPS is it "made in China"?

7th December 2010, 06:43 AM	#5
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	I don't know if it was made in China or not. It's probably a good guess. I Googled the same thing and see the "MHJ" in the part number on many Chinese sites. But I didn't see "MHJ" as the top mark. So I'm no closer. Did you see something I didn't? How can I find a seemingly random IC from the top mark? Between NXP's and Fairchild's websites, and a couple other top mark listing sites, I can often figure out discrete components. But as for ICs... what to do? Perhaps the part marked "252" is an IC which is why I'm having trouble IDing it??

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