What is this SOT23-5 please

[cybermaus]

I tried searching some SMD code bases, but I am not finding many DG at all


The item is on a camera sensor sub-board, and frankly the only reason it is suspect at all because it is the only one where I do not measure any junction pin 4
(red on ground, diode test method) All other SOT23-5 and all other diodes and capacitors measure OK.

I have to admit, it it is a bit if a last-ditch effort.

[fzabkar]

Could it be an RT9178-30CBR 3.0V LDO regulator?

http://www.smdmark.com/en-US/search/code?id=dg

https://www.richtek.com/assets/product_file/RT9178/DS9178-19.pdf

[mikerj]

How old is the camera?  The code and marking match a V6310 reset controller, but it's an old part long out of production.
https://www.datasheets.com/en/part-details/v6310rsp5b--em-microelectronic-20195197

[cybermaus]

Thanks. It's an IP camera from about 2012
a high speed dome PTZ superzoom, so not entirely cheap.

fzabkar : A regulator at this location is unlikely. I would more expect some single logic gate.
Also, I do not see the marking in your suggested PDF?

mikerj :
It's unlikely to be the device you suggest, because while Vss seems to be correct, I have a junctions on what on your suggestion should be NC pins.
Also, but this may be my unfamiliarity with SMD codes, but your PDF shows DG# for 3-letter code option, but a completely different 4-letter code option, and I have a 4 letter code.

[fzabkar]

fzabkar : A regulator at this location is unlikely. I would more expect some single logic gate.
Also, I do not see the marking in your suggested PDF?

The markings are not published in the PDF. They were provided by the smd part marking database.

Can you measure the voltages on the pins?

Are there 3 capacitors connected to this chip? If so, then that would be inconsistent with a logic gate, but would make perfect sense for an LDO.

Can you show us a photo of the whole PCB? Often it is better to see the part in context. Also, it may help to identify this chip if we can identify other chips. Often a designer will use a single source.

[cybermaus]

I see what you mean with the 3 capacitors, good point, I'll go check.

But the code in the database is only DG. 2 chars out of 4 seems a bit broad.
Unless of course if you see more because you are signed in? All I see is:  "DG" "Please login" SOT23-5

[fzabkar]

I see what you mean with the 3 capacitors, good point, I'll go check.

But the code in the database is only DG. 2 chars out of 4 seems a bit broad.
Unless of course if you see more because you are signed in? All I see is:  "DG" "Please login" SOT23-5

Chips often have additional markings. "DG" could be the part ID, while "5" could be a year, and "v" could be a batch code.

The PDF icon has this URL:

https://www.onepcba.com/p/RT9178-30CBR

[timenutgoblin]

I also think it's an LDO voltage regulator. There are bypass and decoupling capacitors.

See attachment below for pinout suggestion:

[cybermaus]

Yes @fzabkar and @timenutgoblin

It is indeed a LDO. The capacitors, as well as the 10K pullup resistor make it extra likely.
Also I figured out it came from a 5V switched regulator upstream, and injecting voltage there showed another short on another part of the board, causing this LDO to be starved.

[fzabkar]

There is a similar LDO here, but "DG" is associated with a 1.8V regulator in a different package.

https://www.vishay.com/docs/74442/sip21106.pdf

This "DG" part is a 2.1V LDO in a SOT23-5 package:

https://pdf.datasheet.live/29eb28f9/anachip.com.tw/AP131-33WA.pdf

[cybermaus]

It is definitely and indeed a regulator, with the above common pinout, and it makes 2.85V out of 5V, and it is still in working order.

In the mean time I traced the problem to another chip that is shorting, and the camera is a loss.
Thanks everyone.