Author Topic: Help needed identifying SOT23 with 43R symbol  (Read 311 times)

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Offline frippTopic starter

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Help needed identifying SOT23 with 43R symbol
« on: November 26, 2024, 11:24:33 am »
Can anybody shed any light on what this component maybe (Symbol=43R, Package=SOT23).  Center pin is grounded.  I have tried all the repositories I know of but no matches for 43R only 43 which throws up many options.
« Last Edit: November 26, 2024, 11:31:36 am by fripp »
 

Online timeandfrequency

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Re: Help needed identifying SOT23 with 43R symbol
« Reply #1 on: November 26, 2024, 12:36:14 pm »
Hello fripp,

Something like a ZR431 (TL431) ?
If you can power the board, measure the voltage at pin 2 (Vz) : it should match to ± 2 % with the calculated value (SMD resistors circled in blue; I cannot read the values because of the limited resolution of the provided pictures). The formula can be found in the datasheet (see 'shunt regulator').
« Last Edit: November 27, 2024, 03:34:42 am by timeandfrequency »
 
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Offline fzabkar

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Offline frippTopic starter

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Re: Help needed identifying SOT23 with 43R symbol
« Reply #3 on: November 26, 2024, 02:04:51 pm »
Thanks I think I am on the right track now
 


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