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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
For what its worth MOSFETs are quite unlikely to get gate damage just due to sitting in a high RF field. Power MOSFET gates can be several nanofarads of capacitance when the device is not powered. This capacitance actually requires a large amount of current to rapidly charge and discharge it to any significant voltage. Anyone who has tried to make standard power MOSFETs switch at MHz will be familiar with this already.
What usually causes the damage is either build up of DC on the gate layer until it finally punches through. Or instantaneous discharging of some other highly charged object into the gate. Be it a person, screwdriver, some nearby conductive object, another MOSFET etc this can instantaneously raise the gate potential to where oxide damage occurs.
In general large die power MOSFETs are more robust than small ones because it takes more Q to raise the C to a dangerous level of V.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Well, the recommended storage is conductive foam. That said, I've received IC's in normal foam wrapped with tinfoil, and they always worked fine.
I did fry a camera once with induced RF field (from a small C/W multiplier) and after that the desk got cleared of sensitive parts before testing anything else.
There's a reason why insurance companies don't usually cover lightning damage- the "random failure" problem. In some cases, a home PC can survive a massive power surge with no apparent damage other than a fried modem, then start misbehaving many weeks later. Same with expensive home entertainment equipment.
I've personally experienced this with the JVC plasma I was fixing- the PSU was *not* the only failed part, even after it was replaced one of the drive IC's (74 series logic) failed after an hour or so, then when this was replaced it worked for a while and one of the Y drive IC's blew up with a shower of sparks. Needless to say, panel replacement was required but I'm not sure how long it will last.. :(
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All stored transistors are dead! The killer: SGTC
