Author Topic: Help me Identify this component by ST  (Read 192 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 »
Hi,

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.
https://www.st.com/resource/en/datasheet/sm15t.pdf

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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