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Component ID

J.BO

New Member
Hi All,
I'm having trouble ID'ing an IC and was hoping some of you seasoned engineers and techs could help me out. U7 is the part in question; I have also attached a schematic to better help understand. I've tried all the code lookup sheets I could find and have gotten close, but I don't think I'm there yet. I thought I had it at (MAX3371EXT+T) but Vcc doesn't line up and the top marking is wrong. U5 is the 8-bit DAC, U4 is the Dual Buffer Gate, and U1 is the Dual VFB Op-Amp. I'm starting to think it might be a switch of some sort, but I'm not sure. Any help is appreciated; if you have further question, please don't hesitate to ask.
 

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sagor1

Active Member
Not sure if that is ABV or A8V. Only thing I can find with A8* marking with similar pinout is the RT9011 by Richtek.
There is also a diode bridge called HSMS-280x. You should be able to determine if is it all diodes, or a regulator with multimeter diode tests.
 

J.BO

New Member
rjenkinsgb,
I was beginning to think it's a switch as well. sagor1, it is definitley ABV, I have a really good microscope here at work with plenty of Isopropyl for cleaning lol. They might be one of those switch IC's, but shouldn't I get continuity on the Normally Closed (NC) leg with COM input leg? Essentially, continuity between leg 3 and 4, or do you think that switch arm floats in a power off condition?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
rjenkinsgb,
I was beginning to think it's a switch as well. sagor1, it is definitley ABV, I have a really good microscope here at work with plenty of Isopropyl for cleaning lol. They might be one of those switch IC's, but shouldn't I get continuity on the Normally Closed (NC) leg with COM input leg? Essentially, continuity between leg 3 and 4, or do you think that switch arm floats in a power off condition?
I would certainly imagine so - you can't test a switch IC with no power or control signals.
 

J.BO

New Member
Alright guys, I'm definitley thinking switch now. I powered it up and I have continuity between 3 & 4 as advertised. Thanks for the help ALL, I love this forum!
 

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