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Help! Can't find cross reference for a discontinued motorola diode in a 48v motor controller

upcycler

Oct 24, 2022
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Oct 24, 2022
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My controller blew a bunch of diodes and I'd very much like to replace them but I've found nothing but dead-ends when trying to find a datasheet or any cross reference info for a replacement.
The diode in question seems bolts onto a heat sink on one side. CR4180RB made by Motorola in Mexico. Any leads to source a compatible replacement would be appreciated.
 

kellys_eye

Jun 25, 2010
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Jun 25, 2010
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5,117
There are likely to be multiple suitable candidates but we can probably only determine that from either a schematic or (possibly) a pic of the actual device - and its placement.

Someone with better Google-fu than me might also find the genuine datasheet.
 

Alec_t

Jul 7, 2015
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Jul 7, 2015
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Google throws up an image of that diode sitting next to a 100V 40A (32A with a case temperature of 75C) MOSFET (RFG40N10) whose datasheet says a typical use is in switch-mode regulators/converters. That suggests to me that the diode is likely a Schottky one with a similar voltage/current rating. Here's a link to the image (on a Russian site!).
 
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