Electronics > Repair
Help needed identifying SOT23 with 43R symbol
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fripp:
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.
timeandfrequency:
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').
fzabkar:
http://markingcodes.com/search/c/43r

https://www.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+%22absolute+maximum%22+43r+sot23
fripp:
Thanks I think I am on the right track now
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