Part identification help please

[DesertRat]

I'm trying to identify this part in the picture attached. It's a 1117 LDO regulator, that much I can determine, but what are the second line numbers/letters? And/Or I should ask, what do they mean? I've looked for an exact replacement, and I can't see to find an exact part by those part identification marks. (It's the part that is in focus).

[philliesfan30m]

Re: Part identification help please

what are all the numbers and letters? 1117 ? ?? ???

[budm]

Re: Part identification help please

That looks like Adjustable 1117, I can see two resistor network connecting the ADJ pin (left pin) to ground and one between ADJ and the Output pin (Middle pin).
You should measure the DC voltage between the ADJ and the Output pin, it should be 1.25V +/- 2% which is the Vref. if the regulator is good. The out put should be equal to 1.25 + Voltage on the adj pin (with ref to ground).
http://www.digikey.com/product-detai...SCT-ND/1967218

[DesertRat]

Re: Part identification help please

what are all the numbers and letters? 1117 ? ?? ???

Sorry philliesfan, they are:
1st line 1117 B
2nd line AD 732K

[DesertRat]

Re: Part identification help please

That looks like Adjustable 1117, I can see two resistor network connecting the ADJ pin (left pin) to ground and one between ADJ and the Output pin (Middle pin).
You should measure the DC voltage between the ADJ and the Output pin, it should be 1.25V +/- 2% which is the Vref. if the regulator is good. The out put should be equal to 1.25 + Voltage on the adj pin (with ref to ground).
http://www.digikey.com/product-detai...SCT-ND/1967218

Thank you budm, I was thinking along that line having read some of your previous posts and troubleshooting guides. I just wasn't positive.

[PeteS in CA]

Re: Part identification help please

2nd line AD 732K

Probably the datecode (32nd week of 2007?) and factory code info. You might look at datecodes on caps, other components and/or the PCB to get an idea when this board was built. That mark to the right of the "1117" looks more like a manufacturer's logo than "B".

[DesertRat]

Re: Part identification help please

Thank you PeteS, that's good to know. I'll see what I can determine in that regard.