Diode Substitution?

EagleTG

Active member
Joined
Aug 23, 2010
Messages
1,349
Reaction score
24
Location
Quakertown, Pennsylvania
I'm prepping an order with Bob Roberts, wanted to ask a quick question I can't seem to figure out.

I know in most applications, you can substitute a higher voltage diode (1N4004 for a 1N4001, for example). I'm repairing the power supply section of a monitor chassis. It calls for an FR105. 1A 600piV Fast Recovery.

Bob only sells FR106. I can't seem to determine if this is a workable substitution. Logic indicates that it shouldn't be a problem, but I wanted to get a second opinion from the group.

1N4937 looks like a proper cross for FR105. Bob doesn't have this either.

I know I can get them elsewhere, but was going to just tag them onto this order if possible.
 

I agree, I'd probably substitute it. But looking at the datasheet... note that the FR106 may not be as fast as the 105; max recovery time of 500ns vs 250ns for the FR105.

I assume it's used in a switching mode PS, so I guess if the frequency is low enough, it won't matter. ...but if the freq is too high, the FR106 may not be able to switch quickly enough.

EDIT: it probably wouldn't matter until frequencies in the multi-MHz range... I think most switchers operate more in the tens or hundres of kHz range. So nevermind... sub away.
 
Last edited:
I agree, I'd probably substitute it. But looking at the datasheet... note that the FR106 may not be as fast as the 105; max recovery time of 500ns vs 250ns for the FR105.

I assume it's used in a switching mode PS, so I guess if the frequency is low enough, it won't matter. ...but if the freq is too high, the FR106 may not be able to switch quickly enough.

EDIT: it probably wouldn't matter until frequencies in the multi-MHz range... I think most switchers operate more in the tens or hundres of kHz range. So nevermind... sub away.

Good eye! I didn't see that. But yeah, rather unlikely to be an issue.
 
Back
Top Bottom