RC-Monster Forums - View Single Post - What cause burned FET driver and FETS on 9920

BrianG · 10:16 AM

Andy is right, the cap would not have caused it. Using a cap with a higher voltage rating than needed is actually good since it won't be running close to the max rating. And those electrolytic caps usually come in v ratings of 6.3v, 10v, 16v, 25v, 35v and so on.

At most, a bad cap could maybe fry the BEC chip if it somehow internally shorted. But most BECs have a thermal and short-circuit cutoff.

After looking at the datasheets for the part numbers you posted, one is a FET driver IC, the other is indeed an output FET. Driver ICs don't usually go bad since they are low current devices. I would think that whatever caused that one to go bad, might have fried others as well.

Here are the datasheets if you're interested.

IR2102S datasheet
IRF7413 datasheet

	(#3)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	05.10.2007, 10:15 AM Andy is right, the cap would not have caused it. Using a cap with a higher voltage rating than needed is actually good since it won't be running close to the max rating. And those electrolytic caps usually come in v ratings of 6.3v, 10v, 16v, 25v, 35v and so on. At most, a bad cap could maybe fry the BEC chip if it somehow internally shorted. But most BECs have a thermal and short-circuit cutoff. After looking at the datasheets for the part numbers you posted, one is a FET driver IC, the other is indeed an output FET. Driver ICs don't usually go bad since they are low current devices. I would think that whatever caused that one to go bad, might have fried others as well. Here are the datasheets if you're interested. IR2102S datasheet IRF7413 datasheet Last edited by BrianG; 05.10.2007 at 10:16 AM.