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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
i just got some to247 igbts off ebay surplus, and on the tube they come in, it says static sensitive device. i have never known igbts where, and i had already touched them without any antistatic gear. are they actualy static sensitive devices, or is that just standard print on the tube. please tell me if there is reason behind my worry that i have rendered all 30 igbts useless! -ben
Registered Member #1381
Joined: Fri Mar 07 2008, 05:24PM
Location: Hungary
Posts: 74
Of course. It's kind of obvious if you think about it. The IGBT is a hybrid device with a "MOSFET" as the input device, which then drives a silicon–controlled rectifier (SCR) as a switched output device. Voltage (Field) controlled devices , have some kind of gate oxid layer which has threshold and brakedown voltage ratings, as charge builds up a channel forms between the semiconducting layers, but if the field shrength exceeds a certain level than the gate oxid will start to brake down, resulting in one of the device's failure modes.
But to answer your question , probably your igbts still work , as long as you weren't floating at high potencial, at that time :)
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
ok, as long as i can still use them XD. all i did was walk dow some carpeted stairs. and one i noticed the warning, i was touching every metal object i passed as to discharge. is there any way to test them though without using them? and i plan on buying some anti static stuff.
edit: wait... does that mean i could have broken mosfets before through static? because i havn't.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
so today i just made a diy static wrist strap. the wrist strap is a metal wire em shield for computer cable. then there is a ling stranded wire with an alagator clip at the end. this can clip to pipes and other grounded objects.
is this sufficient? another thing: if i keep all the pins at the same potential, even if i am charged and i touch the pins no current wants flow through the igbt because the easier path is through the wire or whatever conects the pins, right?
Registered Member #2887
Joined: Sat May 29 2010, 11:10PM
Location: Panama City, Panama
Posts: 107
Yes, it should work, although a resistor is commonly placed between ground and the wrist, This is made so that if you touch a voltage source, the resistor will limit the current flowing through your arm to ground. Static electricity has a very high impedance, so this resistance does not affect the reliability of the wrist. I don't remember the value of the resistor right now, but I think it was around 1k (or was it 10k, investigate it).
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I have never had a power MOSFET or IGBT damaged by static electricity. In fact, I was playing with a ~100 kV dc power supply on my desk with some FETs lying around in it, things were moving, sparking and sticking together on the desk - but the FETs survived. I don't encourage anyone to try this, it's just to show that larger FETs and IGBTs will survive quite some voltages floating around.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
i think im ok then, i dont plan on using the strap for anything other than handling semiconductors. if i need anything more high tech, il just buy a cheap 15$ one. well thanks for the help :D now i know not to touch mosfets unless i know im discharged
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static sensitive igbts???
