PCB electronic components identification - Page 1
Forum section: electronics / beginners

author: seneka21
author_rank: Newbie
timestamp: May 23, 2022, 10:13:49 pm
content: Hello to everyone.I tried to identify by googling about the type of the components depicted on the attached image, but no luck.The aforementioned circuit is a part of smth like a prob head that has a predetermined time of use. More specifically there is a countdown timer which when comes to zero the probe stops working.I am sure that this is just a commercial trick in order to oblige you to buy (unnecessarily) a new head.I was wondering if I could "hack it somehow".Thanks in advance.

author: devinatkin
author_rank: Contributor
timestamp: May 24, 2022, 02:07:35 pm
content: No idea what that part is, but I have my doubts it's part of what's doing the count down to stop the probe from working. It's a 3 terminal part so my bet would be a fet or a bjt based on the parts surrounding it in the photo. Although it could in theory be some sort of weird count down ASIC to stop functioning after a set length of time, more or less.Your wording is very poor as to what it's a part of "circuit is a part of smth like a prob head" a probe head on what, what's the equipment. It's easier to make a bet as to what's causing the shutdown if there's more detail. There's also the possibility that there's a legitimate reason for the probe head to stop after a given time (I'm thinking maybe in a medical device there could be genuine reasons to stop after a given length of operation).

author: free_electron
author_rank: Super Contributor
timestamp: May 24, 2022, 02:57:51 pm
content: single wire memory. probably microchip or dallas sem (maxim)

author: tepalia02
author_rank: Regular Contributor
timestamp: May 24, 2022, 03:04:18 pm
content: Can't read the name written on U2's body. Is it AA98TM? Or something else?

author: gamalot
author_rank: Super Contributor
timestamp: May 24, 2022, 03:19:06 pm
content: Could be 11AA02UID from Microchip:http://ww1.microchip.com/downloads/en/DeviceDoc/20005206A.pdf

author: seneka21
author_rank: Newbie
timestamp: May 24, 2022, 09:23:15 pm
content: Thx a lot for your consideration in my issue.This PCB is a part of a prob or head used for a pretty harmful and completely superficial aesthetic procedure. The worse scenario could be the lose of its effectiveness which in any case is very easy to be checked and promptly counterbalanced with immediate replacement with a new one.Thanks once more

author: seneka21
author_rank: Newbie
timestamp: May 24, 2022, 09:24:41 pm
content: It must be AA8OTM or AABOTM.Thank you.

author: seneka21
author_rank: Newbie
timestamp: May 24, 2022, 09:30:02 pm
content: Thank you.I would agree with you.You were very helpful!

author: seneka21
author_rank: Newbie
timestamp: May 24, 2022, 09:32:02 pm
content: Thank you for taking the time to send me a reply.I ve already checked your link and looks like it s some kind of EEPROM.Thank you once more.

author: seneka21
author_rank: Newbie
timestamp: May 24, 2022, 09:39:00 pm
content: So my next question (forgive me if it sounds stupid).Would be possible to read and reprogram this kind of EEPROM?I have already accomplished a similar procedure on my motherboard's bricked BIOS chip using a CH341A programmer.Thank you in advance.