Component identification help needed

[h3ndr1k]

Hi All!

I am reverse enginering a pcb from a Pet Porte 100-1023 rev 000. After a lot of hours i heve the schematics almost complete. I'm pretty sure that eny electrical engineer would want to step his eyeballs out after seeing it but it seems to be right.

I am left with two components that i cannot id.
- The first one is an transistor looking package with the text HJYQ, it's labeled U4. My current assumption is that it's job is getting the voltage down to 5 v
- The second one is also transistor looking but incredible tiny. My best quess at the text is [something] G, it's labeled Q5

Is there any one that would know how to identify these components?

If anyone would like to check the schematic and check it i would be happy to share, just let me know.

[amyk]

HJxx is 24AA014

The second one looks like 1G (wipe it a little to clean some flux residue off the first character) which is probably a BC847C.

[h3ndr1k]

Hi Amyk,

I do agree on the BC847C, That looks like it fits.
The other link you've sent is the wrong package though... Just to be clear i'm talking about the component in red.

[narkeleptk]

How does the sot23-3 measure on pins? You mention 5v, did you measure that?


I suspect HJ is the id and the YQ is just production date.

[h3ndr1k]

Measured the 5v at the right lower pin

[fzabkar]

U4 looks like an LDO regulator. The centre pin appears to be ground while the other two are probably Vin and Vout.

Edit:

This part seems to fit, but the pinout looks wrong:

MCP1702, Microchip, 250 mA Low Quiescent Current LDO Regulator, 5V, marking HJnn, SOT-23A:
https://ww1.microchip.com/downloads/en/DeviceDoc/22008E.pdf

[h3ndr1k]

I will check tomorrow. Maybe it could be right!
The chunky trace you see at the top is the supply voltage, which go's to pin 3 (vin) if pin 1 goes to ground you might be right! Thank you so much in advance! I learned a lot today.