Sabaj D5 DAC/AMP Repair - Help me Find this IC!

[FennekoFox]

Hey everyone, I am currently troubleshooting my Sabaj D5 DAC and Amp that I have been using at work for the last 5 or so years. One day I go to the lab with the audio working when I leave and when I get back to my desk nothing.

D5 outside of extruded case


Background: The unit powers up the display and control functions work and the pre amps output audio but the headphone outs don't function. After some basic troubleshooting steps I find that the 9V power rail that feeds some small IC's at the end of the signal path has no voltage. Between those IC's and the 9V rail is a diode I get 1K resistance to ground on the regulator side and a short to ground on the IC side indicating at least one of the IC's have failed. Below you can see that only these three IC's are connected to that power rail and at least one of them is bad.

9V rail (x-ray)


Headphone Connections (x-ray)


Now to my problem I cant seem to source this part... I am assuming that this IC is a pair of SPST analog switches but I cant find the part number referenced anywhere. The IC's are marked 48088/1851U and its a rectangular QFN style package with dimensions of 2.75mm x 1.9mm. I have determined most of the pad functions below and was hoping that someone may be able to help me source this part or at least get me some more info on it. I believe the package is called a 16-UFQFN but I mostly work with bare die so I am not too familiar with QFN package variations.

Worse case I will just de-solder all three IC's and then just bridge the signals to the XLR port as I don't really use the 6.35 jack anyway but I would like to avoid a janky solution is possible.

IC to be replaced


IC to be Replaced (x-ray)

[coromonadalix]

it as ESS ES9038Pro DAC   as the audio DAC processor, and its output are differential

now theses ic must be differential amplifiers ...  since we see balanced pcb traces

mm ok   it seem  OPA1612  would be the small soic8  ic's ??   but  the amplifiers

[fzabkar]

https://web.archive.org/web/20210515024128/https://www.esstech.com/wp-content/uploads/2021/03/ES9038PRO-Datasheet-v3.7.pdf


SGM4808B, SGMicro, Wide Power Supply Range Audio Click-Pop Noise Eliminator, 2.7V - 12V, 1 ohm, TQFN-2.6×1.8-16L:
https://www.sg-micro.com/uploads/soft/20220614/1655179841.pdf

[FennekoFox]

SGM4808B, SGMicro, Wide Power Supply Range Audio Click-Pop Noise Eliminator, 2.7V - 12V, 1 ohm, TQFN-2.6×1.8-16L:
https://www.sg-micro.com/uploads/soft/20220614/1655179841.pdf

This is exactly the part thanks for your help on this. How did you end up finding it, I am always looking to improve my methods.

[fzabkar]

https://ipv4.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+%22absolute+maximum%22+4808B

I use "absolute maximum" to filter out spammy web sites.