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Help with SOT-89 component identification

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giosif:
Hello,

Can someone please help me identify the SMD component in the picture attached?
I'm trying to reverse engineer the schematics for the power section of a Tektronix TX1 DMM and this component is in that part of the circuitry.
I am suspecting it is some kind of voltage detector, but I would like to identify the exact make and model.

Thanks!

RES:
Only 9B gives two devices from this chart: http://www.dl7avf.info/charts/smdcode/c9.html#TOC

3   SOT-89   µPC1943T   NE       Nec0611   
3   SOT-89   NJM79L03UA   JRC           

The µPC1943T is an adjustable precision shunt regulator. (NEC) (http://www.chipfind.net/datasheet/nec/upc1943.htm)

??

amyk:

--- Quote from: RES on March 17, 2019, 08:47:01 pm ---Only 9B gives two devices from this chart: http://www.dl7avf.info/charts/smdcode/c9.html#TOC

3   SOT-89   µPC1943T   NE       Nec0611   
3   SOT-89   NJM79L03UA   JRC           

The µPC1943T is an adjustable precision shunt regulator. (NEC) (http://www.chipfind.net/datasheet/nec/upc1943.htm)

??

--- End quote ---
The marking is probably not 9B, but 302. You can often confirm your guesses by looking for pictures from sellers who are selling the part. A UPC1943T looks like this: http://www.eric1688.com/product.aspx?id=384410

The marking for the NJU7201U30 looks similar, 30A instead of 302: https://www.aliexpress.com/item/10pcs-lot-NJU7201U30-NJU7201U30-TE1-30A/32841594775.html

I suspect it's an NJUxxxx part.

floobydust:
The zero and oh are a different character, it could be OB9 not 0B9. I was thinking a Torex LDO.

amyk:

--- Quote from: floobydust on March 17, 2019, 10:51:14 pm ---The zero and oh are a different character, it could be OB9 not 0B9. I was thinking a Torex LDO.

--- End quote ---
Torex don't have 2x3 character markings, from what I've found: https://www.aliexpress.com/item/XC6203P332PR-SOT-89-TOREX/32344792830.html

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