Author Topic: Help me Identify this component by ST  (Read 204 times)

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Offline CrazyTiger

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Help me Identify this component by ST
« on: August 24, 2019, 07:20:18 am »

I have this diode by ST which is shorted as someone fed 240AC to the 24v DC line.

I believe its a bidirectional TVS diode, the marking is BEX. Can anyone suggest what would be the part number for this.
 My first guess is it might be SM15T39CA.

Is there any other possibility?

Offline fzabkar

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Re: Help me Identify this component by ST
« Reply #1 on: August 24, 2019, 07:35:05 am »
It looks correct, but I'm wondering why the designer didn't choose a 24V unidirectional diode, assuming it is connected across a regulated 24VDC supply. A bidirectional diode affords no real reverse polarity protection, and a 40V breakdown voltage might be too high for the circuit.  :-//

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