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ZCD 4N35SM optoisolator alternative
greencardigan
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Posted on 02/20/2023 3:54 AM
Hi,

I was about to order parts for the Jim's ZCD boards that use the 4N35SM optoisolators. My usual source is digikey and they are currently out of stock with a long lead time.

I see that they have the 4N37SM in stock, which seems to have exactly the same specifications according to the datasheets, so I'm assuming it would be suitable for a direct swap but was hoping for confirmation?

https://www.digik...7SM/400621
Edited by greencardigan on 02/20/2023 4:31 PM
 
renatoa
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Posted on 02/20/2023 6:46 AM
Looks identical even in the datasheet... which is weird, why two names for apparently for the same IC...
 
randytsuch
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Posted on 02/20/2023 2:01 PM
Some guys said datasheets from the 90's said
The 4N35 is rated for 3550VAC, the 4N36 for 2500VAC, and the 4N37
for 1500VAC, all peak.
 
greencardigan
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Posted on 02/20/2023 4:24 PM
I did read something about that too. But strange the current datasheets don't show any difference.

I'll go ahead with my order.
 
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