Electronics > Beginners

Replacing a fixed and a adjustable regulator

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gkmaia:
I looking for some help replacing a couple regulators. IC 101 and 107 on the schematic attached.

First one is a s-81250hg and the closest I found was:
https://www.ablic.com/en/doc/datasheet/voltage_regulator/S812C_E.pdf

Second one is a TK11640. I am struggling with this one because it is not fixed. It goes in increments of 0.5 from 2v up to 5v.

S-81250HG is here: https://www.digchip.com/datasheets/parts/datasheet/432/S-81250HG-pdf.php
TK11640  is here: https://www.datasheetarchive.com/pdf/download.php?id=6b04dbd83b9c95ca8b5539f6738b79f62a036b&type=O&term=TK1164

mvs:

--- Quote from: gkmaia on January 06, 2019, 02:41:32 am ---Second one is a TK11640. I am struggling with this one because it is not fixed. It goes in increments of 0.5 from 2v up to 5v.
--- End quote ---
They all are fixed. TK11640 is 4.0V, TK11630 (IC107) is 3.0V, S-81250HG (IC101) is 5.0V...

Zero999:
The TK11640 is fixed and is made to the required voltage by the manufacturer.

No doubt all of those regulators could be replaced with fixed/adjustable low dropout regulators with a suitable current rating.

gkmaia:
Thanks guys, those are the ones I found that are the closest ones with matching pins.

Sorry for such basic question. I am a beginner and don't want to get it wrong.

3v - Tk11630
https://www.digikey.co.nz/short/p73f72

5v - s-81250hg
https://www.digikey.co.nz/product-detail/en/ablic-u-s-a-inc/S-812C50AY-B2-U/728-1066-ND/3609196

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