Diode across a coil

godfrey

Member
Join Date
Apr 2002
Location
Charlotte, NC
Posts
412
I'm looking for a recomendation for a part No. for a diode to put across the relays in my panel. They are 24 VDC DPDT P & B relays. I thought a 1N4002 should work. What have you used?
 
Good Question. I found my reference for diode and a resistor, but it gave no number.

diode_resistor_snubber_for_DC_load.JPG


I'll have to poke around for an answer.

Dan
 
Use 1N4937

1N4002 reverse rating is 120 volts. ON semi datasheet.
1N4004 and 1N4007 are prefered devices (mass-produced).
There isn't a speed rating, because these aren't designed for fast applications. In most cases, they're fast enough.

I prefer and use 1N4937. Datasheet. These are rated for freewheeling applications. Again, 1N4935 and 1N4937 are prefered devices. That means they are mass-produced so price should be lower.

The link posted by Ron above is very good, but I have one caution. They say '(eg 1N4148)'. That diode is fast, but only rated for 200 mA. You could only get away with that for the tiny relays they are discussing.
Use a 1N4937 as a universal device. 1 amp, 600 volt.
 
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