I build maching mosfet from this .
http://www.diamondstar.de/transistor_matching_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 ?
http://www.diamondstar.de/transistor_matching_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 ?
dytln_02 said: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
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?
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?
MikeB said: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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