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TL401 928 -> TL431

Desbo

Mar 6, 2022
14
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Mar 6, 2022
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I am trying to replace this transistor (well, I think it’s a transistor - a small D shape one) I cannot find reference to it anywhere. Can anyone assist a noob. Thanks.
 

kellys_eye

Jun 25, 2010
6,514
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Jun 25, 2010
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6,514
Why are you replacing it? If you don't know what it is how do you know it's faulty?

Post a pic of the device and the surrounding circuit board.
 

Desbo

Mar 6, 2022
14
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Mar 6, 2022
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It turns out the number is TL431, which is a zener diode. The number was so tiny and hard to read I misread it. Now I have learnt all about this important device. Hope I didn’t waste anyone’s time.
 

WHONOES

May 20, 2017
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May 20, 2017
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More accurately, it is an adjustable shunt regulator.
 

bertus

Moderator
Nov 8, 2019
3,381
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Nov 8, 2019
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3,381
Hello,

As said, the TL431 does come in a TO92 housing:
TL431_TO92_version.png
For more info see the aattached datasheet.

Bertus
 

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