Orders some irfz44n mosfets off eBay from china worst buy ever, all 50 transistor have a short between drain and source, when installed in an amplifier it works on psu when when it goes into the car and remote voltage is applied they all blows, but it's kinda funny how it still works with a short between drain and source on a computer power supply, but when in a car it blows at either turning on or turning off the amplifier
Short between drain and source and its new
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Short between drain and source and its new
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Yeah, it's best to stick with reliable sources for transistors and ICs.
There are a few reliable Chinese sources, but most are not.
We all seem to learn this the hard way, though.
There are a few reliable Chinese sources, but most are not.
We all seem to learn this the hard way, though.
So now I'm gon have to order some maybe from Digi-Key
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Yes, DigiKey is a reliable source.
I order most of my parts from Mouser since they're only a few states away from me.
I order most of my parts from Mouser since they're only a few states away from me.
I ordered some parts since recently from that all of which were all functional, I tried mousers but they cost too much to ship so I'll work with Digi-Key just that I already ordered the 50 fets from eBay when I was ordering from Digi-Key so I didn't add any of those fets, I should have tho
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Contradicting/Impossible.
If shorted Drain to Source they will never ever work, anywhere.
In circuit they aren't but they are out of circuit and blows in car
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To be sure of your findings You'll need to short the gate to source when you're doing those tests. The strays can sometimes charge up the gate enough to switch the mosfet on hard.
What I notice is that if any voltage apart from straight from battery fries the fets but straight from battery b+ doesn't, and no there isn't any problem in the amplifier remote section
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Nope. If you short the source and gate pins on an enhancement mode fet like this one you're the safest that you can be. Under this condition, a working fet should present a high impedance in one direction and that way you can tell whether or not there's a short between drain to source.
When I do that I get 000 on my meter meaning shorted
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In some conditions, it may be wrifgt to measure 0Ω: if you have a good DMM, then put the MOSFETs pin down and tab to the table. Then, from left to right you will wave Gate, Drain and Source in this order. With the DMM in the diode test, put the black to the drain and red to source. A diode drop you will have (supposing N MOSFET). Then open it putting the red at gate by a moment and black to source, and back red to drain. In a good transistor, the drain to source will measure near 0Ω. Then, make again but with lead inverted, to close the devise: black to gate and red to source, momentarily. Measuring again drain to source you will get in a good transistor, a diode in the reverse way and an open circuit in the direct connection. Perhaps the MOSFET's were not closed after test.
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