Re: Identify replacement diode



Right, that makes sense.

So the "instantaneous forward current" graphs show Vf vs If at various temps. I figure as the charger has 2.4A and 1A outputs, total 3.4A, and each diode would probably take half the current, that makes about 2A with losses. Inside the charger would probably not exceed 25C.

The CSRS1045-A line lands on about 350mV. The same on the MBR40250 lands on about 660mV. The SBM1045VSS comes in at around 380mV....

Re: Identify replacement diode



Nothing on Aliexpress or eBay. Mouser and Digikey cost AUD25+ just for shipping. It'd be cheaper to buy a replacement charger. I don't mind spending $10 to keep eWaste our of landfill, but $25 us a bit much....

Re: Identify replacement diode



Yay, the specs on that look very close. Thanks dude! I'll try to source some of those....

Re: Identify replacement diode



Thanks for the info. Can you elaborate on why this is bad design? A few times I've seen some circuits double-up on components to double their combined ratings, and I just figured it was much cheaper to use two common components that a single less-common but higher-rating equivalent. I suppose in the case of a pair of diodes, if the forward voltage is slightly lower on one, that might mean all current flows through that diode?



That's an interesting idea. There's almost certainly room for a 2-lead TO220...

I'm trying to find a replacement diode for one that has gone short.

I have a generic USB charger that went short circuit to ground on 5V. I found that one of a pair of identical diodes in parallel (and in series with transformer secondary winding) has gone short in both directions, so I suspect it's bad. The marking is CSRS1045, which I believe is a low barrier Schottky with max current 10A and max reverse 45V. I found a spec sheet for CSRS1045-A that has same specs and also says 350mV drop when forward biased.

I can't find the exact part number for sale. Similar...

Re: New Members - please post your introductions here

Hi, Jez here from Australia.