Electronics > Repair
Help identify Sot-23 part number marking starting with "E4" or "F1"
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varnasfix:
Hello everyone!

I have "boiled" my head trying to identify a Sot-23 part from a pcb driving an IGBT module on an inverter.

In different production batches they have used two different sot-23 parts so there are two markings starting with "E4" or "F1" to help identify the part number.
Also in both occasions the part appears on the pcb both pins 1 & 2 are connected which would indicate towards a dual diode. However if we measure between pins 1 & 3 there is a diode in both ways...
Both transistor LCR testers I have don't even recognize it and message "part unknown ..." appears.

There are photos of both places that the part is used on the pcb.

Thank you!
fzabkar:
E4xx = SPX2431AM, 2.5V precision voltage reference

https://www.maxlinear.com/ds/spx2431.pdf
https://www.lcsc.com/datasheet/lcsc_datasheet_1810010516_MaxLinear-SPX2431AM-L-TR_C94430.pdf (Sipex)

https://pt.aliexpress.com/item/1005006330033066.html (photo)

https://www.lcsc.com/product-detail/Voltage-Reference_MaxLinear-SPX2431AM-L-TR_C94430.html (datasheet & photo)

F1xx = SPX2431AM

http://eric1688.com/mobile/product.aspx?id=390287 (photo)
varnasfix:
Thank you so much. You are an absolute legend!

I must have gone through dozens and dozens of datasheets without any results

:phew:

fzabkar:

--- Quote from: varnasfix on October 20, 2024, 10:39:00 pm ---I must have gone through dozens and dozens of datasheets without any results
--- End quote ---

I didn't have any luck with datasheets, either. Instead, I resorted to Google Images and an Aliexpress search (with images).
davedrosen:
Hi, This is my first post.    There is  handy app called SMD. You put in the code and it lists the devices.
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