SMT marking AQT B A/D

[Neoxy]

Hello everyone,

After a lot of searching on the net and even ChatGPT I cannot find a component that has the marking AQT. After some reverse engineering I concluded that this is some type of voltage supervisor with a threshold voltage of cca. 1.22V. The package is DFN-8 and input voltage is greater than 24V. When voltage is below 23.5V the IC has its output open-drain active and disables (pulls to ground) a DC/DC buck converter. 

The correct orientation could not be found as the IC went up in flames But I suspect the pins to be: 1 - Vin (24V+), 2 - GND, 3 - GND, 4 - NC, 5 - GND, 6 - Vin(24V+), 7 - OUTPUT, 8 - REFERENCE (24V to voltage divider to 1.22V threshold). I suspect that pins 2,3, 6 could be some settings pins. 

I would really appreciate some help if someone came across this small component. This component is in the MAN Yacht motors Electronic Lever control. Checked all SMD codebooks, compared Farnell and Mouser IC supervisors to no avail.

Thank you and best regards

[ffranzini]

Take a look of this TC1301AQTAVMF
Combined voltage regulator and voltage detector

Regards

Francesco

[Neoxy]

Thanks for the reply. This one was the first IC I checked. Sadly the pinout is not a match and I am certain it is not the part I am looking for as the absolute maximum Vin is 6V. In my case Vin is 24V.

[fzabkar]

Maybe a photo of the PCB would help.

[Neoxy]

I took some photos but I doubt they will be of any help. The board is covered in thick lacquer and it is very hard to work with. I even went so far to decapsulate the faulty component and exposing the die to see if has any markings or at least manufacturer name on the die but was not lucky

[Neoxy]

Ok guys, I think I won


After giving the silicon die one more try I barely distinguished the MAXIM logo. (My stereoscope is sadly not hi end). This led me to the:

https://www.stg-maximintegrated.com/en/design/packaging/topmark.html

There were multiple hits for AQT. But After going through the datasheets I conclude the part I was loking for is the MAX16010TAB-T. Does anyone wish to confirm my findings?

https://www.stg-maximintegrated.com/en/products/power/supervisors-voltage-monitors-sequencers/MAX16010.html

Thank you for all the help. Best regards

[fzabkar]

Looks good to me. Congratulations.

[Swake]

I'm impressed!