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Originally Posted by roboticsjenkins
They blew because you probably grounded the Victors out because I had that problem last year. It's better to mount them on a piece of material that is not a conductor of electricity......Thats my guess
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Andrew,
The case of the Victors is an insulator. We mount our electricals on a punched aluminum sheet and have never had a problem.
"From DigiKey: IRL3103-ND"
It is really interesting if you take a look at the data sheet on these little gems.
http://www.irf.com/product-info/data...ta/irl3103.pdf Note under maximum ratings, that continuous current is 64 amps and pulsed current is 220 amps per device (limited by junction temperature). Remember that there are three devices in parallel for 64 x 3=192 amps as long as you can keep the little buggers cool. When teams blow these up, there is some extreme abuse occuring. High currents over long periods of time, heat and/or metal flakes in of near the devices spell destruction. Changing FETs is not a guaranteed fix, other devices may be destroyed when a FET(s) short.
Please note that the Drain and the tab of the package are connected together. That means that the tabs of half of the FETs in the victor are connected to battery positive and the tabs of the other half are connected to motor positive. Keep conductive material away from the FETs.