FLIR TK Scout | Need help identify BGA chip - Page 1
Forum section: electronics / general

author: w0nk1
author_rank: Contributor
timestamp: July 30, 2022, 08:48:09 am
content: Hi guys,could anyone tell me, which component this IC is? What I can say, it is a BGA package. With the given markings I can't find anything via google. Any help would be very appreciated. Thank you!

author: dennis1573
author_rank: Contributor
timestamp: July 31, 2022, 07:29:07 pm
content: Hi,This might be an STC3115AIJT according to the datasheet (page 32) Marking is O23Datasheet:https://www.mouser.de/datasheet/2/389/stc3115-1850233.pdf

author: w0nk1
author_rank: Contributor
timestamp: August 01, 2022, 05:51:57 am
content: Hi Dennis,thanks for your reply! After some research I've also found this one:https://www.st.com/resource/en/datasheet/gg25l.pdfAny clue which is the right one? TheGG25LAJshow023either. Very confusing.

author: dennis1573
author_rank: Contributor
timestamp: August 01, 2022, 08:10:11 am
content: Hi,wow even the components around it are the same.. well..Its a Flipchip/Bare die bga Package so the Silicon structure on the underside is visible.If you still have the defective chip and access to a strong Microscope,you might be able to find a part number on the die somewhere.I see you are also from Germany, i have an old Leitz Wetzlar SM-Lux Microscope.If you want, you can send the chip over and i have a look at it (but i can't guarantee anything of course).Just send me a PN, if you are interrested :-)I attached some Pictures for illustration, i actually bought it to discover "Silicon Art"

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 01, 2022, 08:21:33 am
content: Quote from: w0nk1 on August 01, 2022, 05:51:57 amFor all I can see they are the same, even the register mapping is the same

author: w0nk1
author_rank: Contributor
timestamp: August 01, 2022, 08:49:57 am
content: Quote from: dennis1573 on August 01, 2022, 08:10:11 amYep, I am from Germany. ;-)I bought yesterday theGG25LAJ. I will give it a try and maybe it works out just fine. If it is not, I will come back to your "send it in" idea. ;-) Thank you!QuoteMight be a chance, that it is really the same - we will see.

author: dennis1573
author_rank: Contributor
timestamp: August 01, 2022, 08:57:27 am
content: Ok no problem, i didnt compare the datasheets in detail.If they are almost the same, and the MCU doesnt check the "REG_ID" Register.It might actually work, Good luck :-)

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 01, 2022, 09:58:09 am
content: Quote from: dennis1573 on August 01, 2022, 08:57:27 amBoth 0x14

author: w0nk1
author_rank: Contributor
timestamp: August 01, 2022, 10:09:19 am
content: Quote from: PA0PBZ on August 01, 2022, 09:58:09 amPerfect!

author: w0nk1
author_rank: Contributor
timestamp: August 01, 2022, 10:10:46 am
content: Quote from: dennis1573 on July 31, 2022, 07:29:07 pmMay I ask how you got to this specific result? I find it quite hard to google such things.

author: dennis1573
author_rank: Contributor
timestamp: August 01, 2022, 05:48:29 pm
content: Quote from: w0nk1 on August 01, 2022, 10:10:46 amwell.. sometimes its quite hard for me too.. for example, if you only know the package type and it has just a 3 letter marking on it...In that case, i use Google Images alot.I just type in "DFN-10 652" for example, and get closeup pictures (usually sellers on aliexpress ect... do this).I looked at your Pictures, and saw 'ST' (STmicroelectronics) printed on the IC. That narrows it down quite a bit already.Then i saw the shunt resistor next to it, since its a Battery powered device and the IC is monitoring current draw i thought its probably easy to find out.So i went to the Mouser.com website, and typed STmicroelectronics in the searchbar and chose battery management as category.There were only 35 ICs listed, and the IC Package Picture for the stc3115 was a perfect match.Also the application layout design on page 11 of the datasheet, looks very similar to what i can see in your Pictures.I just had a look at the GG25LAJ on the Mouser website, and its listed as a CSP-12 package type... i didnt notice that, when i compared the datasheets...Usually the Number behind the Package type, is the number of pins. For example, the stc3117 is a CSP-9 device and has 9 solder balls.the stc3115 is a CSP-10, and has 10 solder balls (the IC in your pictures has 10 pins aswell).So i had another look at the GG23LAJ datasheet, and on Page 1 under device summary it says its a CSP-12.But directly above it on the same Page under Features, it says its a 10-bump CSP Package... so i really dont know...if the GG25LAJ is really in a CSP-12 package, it will probably not fit...

author: w0nk1
author_rank: Contributor
timestamp: August 02, 2022, 07:41:56 am
content: Hi Dennis,thanks a lot for your very detailed explanation! This was very helpful indeed. I will keep you guys posted regarding to theGG25LAJ. If it won't fit, I will order theSTC3115AIJT. I even would buy it now, but I am next week in vacation andmouser, digikey, RSetc. seem to be out of stock. :-/

author: w0nk1
author_rank: Contributor
timestamp: August 25, 2022, 08:16:02 pm
content: Does anyone knows, if theSTC3115IJTmight also work?