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Old 6th June 2006, 08:55 PM   #1
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Default Help Problem With IRF610

I build maching mosfet from this .
http://www.diamondstar.de/transistor...ng_mosfet.html

Using 2.2K Ohm 1/4W and 15v PSU Using LM317

First Time I check 10 pcs IRF610 , Measure Vgs I get around ~3.5v up to ~4.0v

Test it several times Now I got Vgs Around ~0.5v
I try put in board all working but, I got dc offset ~3v up to ~9v

Put another IRF610 vgs ~3.5 up to ~3.7 I got dc offset -10mV and 70mv (only check one times)

Is IRF610 with Vgs ~0.5v has broken ?
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Old 6th June 2006, 09:13 PM   #2
MikeB is offline MikeB  Germany
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Default Re: Help Problem With IRF610

Quote:
Originally posted by dytln_02
Is IRF610 with Vgs ~0.5v has broken ?
Yes...

Mosfets are very sensitive to touching, the slightet ESD (Electro Static Discharge) kills them.
Typical Vgs of IRFs is ~3.6v.

Mike
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Old 6th June 2006, 09:25 PM   #3
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thanks mikeB
how to check without kill them ?
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Old 6th June 2006, 09:29 PM   #4
MikeB is offline MikeB  Germany
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Discharge yourself before touching the mosfets by touching something grounded...

Mike
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Old 6th June 2006, 09:34 PM   #5
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thanks mikeB.
I wait new amps from you...
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Old 6th June 2006, 11:15 PM   #6
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Very important for ALL the mosfets:don't forget to put a protection with 12V Zener and a normal 1N4004 or similar diode.According to my experience this is the main cause of mosfets dead (with the ESD voltage).
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Old 7th June 2006, 11:00 AM   #7
AndrewT is offline AndrewT  Scotland
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Hi Parsecaudio,
your warning is very valid for low capacitance FETs, do you think that it applies to high capacitance power FETs?

I have handled and/or replaced many power FETs without problems nor earthing/static discharge leads/wrist bands: 2sk225/j81, 2sk1058/j162 and 2sk1529j200.

Before I touch my 2sk389/j109 I will need to invest in some earthing procedures. Just how far do I need to go? I use a formica table top for my assembly. Should this be replaced or covered with a conductive film?
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regards Andrew T.
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Old 7th June 2006, 01:18 PM   #8
PMA is offline PMA  Europe
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Quote:
Originally posted by MikeB
Discharge yourself before touching the mosfets by touching something grounded...

Mike
..... and hope the MOSFET has not lied on well insulated charged plastic wafer before you, properly discharged, try to touch it ...
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Old 7th June 2006, 06:14 PM   #9
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An easy, cheap precaution is to slip a paperclip across all three legs, assuming a flat package, and leave it there until you are ready to solder the device into the circuit board. I store my power transistors in anti-static plastic bags with paperclips on their legs.
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