A friend blew up the power devices on an RCMC board. There two pairs of Mosfets on the board, LR024Z and FR5305. While I can find the FR5305s, the LR024Zs are listed as obsolete by all the major suppliers including Mouser, Digikey, Allied, and Newark. First I am surprised the device is already obsolete?? Does anyone know of a substitute? NTE is no help here.
Pete
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Those components are part of the motor driver circuit. I have ran into the same issue and the same search results, I was going to look into a equivalent replacement for those parts but have not done the research yet.
You are better off replacing the whole board at this point, removing those components can also be a pain because the entire back side of those components is a heat sink which is also soldered to the RCMC board. Its not impossible just difficult and you risk pealing traces up.
It's very difficult to get those off! I am one for two in fixing them. In my defense, I believe the excessive heat that cooked them in the first place probably did most of the damage to the one that I wrecked getting the part off.
This looks to be pretty close: IRLR024NTRPBF. I really doubt that there's enough difference to affect things.
I attached the data sheet for reference. IRLR024Z-datasheetz.pdf
Is this the same?
Good to know. Since we don't have to return the old board I think the plan will be to order a new board, then try and see if we can fix the old one. Thanks for the tips.
Thanks Chuck. Mouser was the first placed I checked. I guess I needed some more letters. I will be ordering a few, I know they have FR5305s as well.
Pete
Unless you have the right soldering iron and lots of experience with surface mount repair better to just replace the board. Most pc boards today are not meant to be repaired, and heating them up a second time destroys them
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