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Homeroasters - Home Roasting Coffee Community » DATALOGGERS - CONTROLLERS - RATE OF RISE METERS » Dataloggers/Controllers/Rate of Rise Meters

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ZCD 4N35SM optoisolator alternative
greencardigan	#1 Posted on 02/20/2023 3:54 AM
1 1/2 Pounder Posts: 1183 Joined: November 21, 2010	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	#2 Posted on 02/20/2023 6:46 AM
Administrator Posts: 2728 Joined: September 30, 2016	Looks identical even in the datasheet... which is weird, why two names for apparently for the same IC...


randytsuch	#3 Posted on 02/20/2023 2:01 PM
1/2 Pounder Posts: 394 Joined: June 20, 2009	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	#4 Posted on 02/20/2023 4:24 PM
1 1/2 Pounder Posts: 1183 Joined: November 21, 2010	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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