Help Problem With IRF610

dytln_02 · 6th June 2006, 07:55 PM

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 ?

MikeB · 6th June 2006, 08:13 PM

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

dytln_02 · 6th June 2006, 08:25 PM

thanks mikeB
how to check without kill them ?

MikeB · 6th June 2006, 08:29 PM

Discharge yourself before touching the mosfets by touching something grounded...

Mike

dytln_02 · 6th June 2006, 08:34 PM

thanks mikeB.
I wait new amps from you...

parsecaudio · 6th June 2006, 10:15 PM

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).

AndrewT · 7th June 2006, 10:00 AM

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?

PMA · 7th June 2006, 12:18 PM

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 ...

traderbam · 7th June 2006, 05:14 PM

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.

6th June 2006, 07:55 PM	#1
dytln_02 diyAudio Member Join Date: Jan 2006 Location: solo	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 ?

7th June 2006, 10:00 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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? __________________ regards Andrew T.

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6th June 2006, 08:25 PM	#3
dytln_02 diyAudio Member Join Date: Jan 2006 Location: solo	thanks mikeB how to check without kill them ?

6th June 2006, 08:29 PM	#4
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	Discharge yourself before touching the mosfets by touching something grounded... Mike

6th June 2006, 08:34 PM	#5
dytln_02 diyAudio Member Join Date: Jan 2006 Location: solo	thanks mikeB. I wait new amps from you...

6th June 2006, 10:15 PM	#6
parsecaudio diyAudio Member Join Date: Apr 2004 Location: ventimiglia	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).

7th June 2006, 05:14 PM	#9
traderbam diyAudio Member Join Date: Jan 2002 Location: Earth	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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