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i have using P channel mosfet for high side switching. the mosfet was frequenctly failed . i.e the gate to source shorted . resistance forming across the gate to source of MOSFET. the load power i have using less than 0.5W only. even though the MOSFET continously failed. To switch on the MOSFET the gate of mosfet is i give striagh ground . is it the reason for forming resistance across the gate to source.

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    \$\begingroup\$ post your circuit also.It may help us to give exact answer \$\endgroup\$ – Sathyanarayanan G Jun 1 '16 at 6:55
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    \$\begingroup\$ Apart from the circuit, the part number of the specific device you are using will be useful. \$\endgroup\$ – Peter Smith Jun 1 '16 at 8:07
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    \$\begingroup\$ Things that kill mosfets are: Overvoltage (including really fast inductive spikes), overcurrent (including really brief spikes) and overtemperature, those are the three main ones, it only takes microseconds to kill a mosfet \$\endgroup\$ – Sam Jun 1 '16 at 10:21
  • \$\begingroup\$ I would guess that you're exceeding the Vgs rating of your MOSFET, but since you haven't told us what MOSFET you have or shown us how you've connected it I could be wrong... \$\endgroup\$ – brhans Jun 1 '16 at 11:49
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I have found the reason for mosfet failure ( i.e gate to source damage ). high spike voltage in the gate terminal is the reason damage. the high voltage spike from the soldering ion station. i have using only branded ion only. eventhough the high voltage spike comming from the soldering road. the high voltage spike affecting the mosfet isolated gate terminal. i have tried i different MOSFET the same problems is happening. i have tried in another soldering station this problems is not comming . then only i have found the voltage spike from the soldering station only.

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