Timeline for Identifying a transistor, responsible of driving a 12 V fan
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 27, 2022 at 1:39 | comment | added | Louis | @User9123, Yes looks like it, and the sideways 2A is the assembly lot code. | |
| Jan 26, 2022 at 9:41 | comment | added | User9123 | Thanks Louis, I think I finally found what it is, AO3413 this is the ADBA mosfet chip. | |
| Jan 23, 2022 at 5:04 | comment | added | Louis | You most likely will need to create the interconnections diagram between that device and to device it connects to. It should help identify it. | |
| Jan 22, 2022 at 21:43 | comment | added | User9123 | This one for example datasheets.maximintegrated.com/en/ds/MAX6375-MAX6380.pdf at page number 5 it says ADB and ADE, which also fits the two chips marking i mentioned | |
| Jan 22, 2022 at 21:42 | comment | added | User9123 | Thanks Louis, the PDTA114TT fits more in size, I'm still actually researching a bit more, on that 11 datasheet it reads 100mA collector current, which sounds a bit low for driving two 80mm fans, the 3906 can drive up to 200mA which seems suitable for driving them, could it be that these are actually voltage detectors, specifically for the hall sensor of these fans, as I noticed when i actually planted a general purpose PNP BJTS there, and ran the Graphic card, i get three fans running, and I could change their speed, but there were no rpm recorded. | |
| Jan 22, 2022 at 16:36 | comment | added | Louis | The 11 marking (PDTA114TT or PDTA114TE) is for a PNP very similar to the 3906 with the exception of an added base resistor. This may be either a replacement for availability, or a design fix. My money would be on the design fix. The TT and TE are not the same size and footprint. Validate with your component dimension. | |
| Jan 21, 2022 at 23:15 | comment | added | User9123 | This can still be the correct answer, but I need to confirm this, as if the 11 marking is equal to the 2A then its possible, but based on the naming difference it seems to be sticking with the AD marking i still cant tell what it actually is anyway :) | |
| Jan 21, 2022 at 21:31 | comment | added | User9123 | Louis, thanks once again, I think this is not the correct answer anymore. so far I have found the exact same chip with name ADEA instead of ADBA, and it has a side marking of number 11 so its not a 2A chip its more of an AD sot-23 chip, I have got the same GPU as defect and found that out. | |
| Jan 17, 2022 at 20:54 | comment | added | User9123 | Thanks again, Louis, I went with a 2F alternative KST2907A | |
| Jan 17, 2022 at 13:46 | comment | added | Louis | A 4403 would be a good substitute as most parameters are very similar, but can drive 600mA as compare to 200mA for the 3906. Thanks for the vote . | |
| Jan 17, 2022 at 8:44 | vote | accept | User9123 | ||
| Jan 21, 2022 at 21:31 | |||||
| Jan 17, 2022 at 8:44 | comment | added | User9123 | Thanks again, Louis. based on the analysis, it seems to be correct, I will accept your answer, I will also use a PNP BJT with some what higher current rates, as I have seen this transistor explode in several web posts | |
| Jan 17, 2022 at 4:02 | comment | added | Louis | That is my thinking, Not sure that the ADBA stand for. The 2A marking is standardize for 3906, so if it's not a 3906, why would they indicated 2A. I'm pretty confident. | |
| Jan 16, 2022 at 9:27 | comment | added | User9123 | Thanks Louis, is the 2A the marking in this case? | |
| S Jan 16, 2022 at 3:55 | review | First answers | |||
| Jan 16, 2022 at 6:38 | |||||
| S Jan 16, 2022 at 3:55 | history | answered | Louis | CC BY-SA 4.0 |