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4hv.org :: Forums :: General Science and Electronics
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ISOTOP package

Move Thread LAN_403
Dr. Dark Current
Wed Sept 24 2008, 10:34AM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
is Pin1 power source and pin4 signal/gate source, or the other way round?
Link2

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Experimentonomen
Wed Sept 24 2008, 03:04PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
Its like any fet, just that u have a second source connection.
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guitardude012
Wed Sept 24 2008, 03:46PM
guitardude012 Registered Member #968 Joined: Fri Aug 24 2007, 04:54PM
Location: Norman, Oklahoma
Posts: 104
Right the two source terminals will probably test as connected on a multimeter.

edit: fixed typo
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101111
Wed Sept 24 2008, 04:41PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
guitardude012 wrote ...

Right the two source terminals will probably test as conneted on a multimeter.

I can confirm that.
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Dr. Dark Current
Wed Sept 24 2008, 07:29PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Yes, but I thought one is intended for main current path while the other is for connecing to gate driver, or it doesn't matter?
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guitardude012
Wed Sept 24 2008, 07:36PM
guitardude012 Registered Member #968 Joined: Fri Aug 24 2007, 04:54PM
Location: Norman, Oklahoma
Posts: 104
I don't believe so. The Spec Sheet shows them connected before being used by any other part of the schematic. I believe under low power applications you may leave pin 1 or pin 4 unconnected.

edit:

Wikipedia:
"In general, the MOSFET is a four-terminal device, and in integrated circuits many of the MOSFETs share a body connection, not necessarily connected to the source terminals of all the transistors." Link2

I have looked the document over twice and can't find a reference to either pin 1,4 being the body connection. The spec sheet doesn't lead me to believe either pin is connected to only a subset of the transistor source terminals.
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101111
Wed Sept 24 2008, 08:48PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
Try to use a shortsafe power supply and a Ameter and short circuit the pins.
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Steve Ward
Wed Sept 24 2008, 11:40PM
Steve Ward Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Either terminal can be used as the power source and kelvin source. Internally its a heavy bus bar type connection that solders down to the die, symmetrical to either tab.
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Dr. Dark Current
Thu Sept 25 2008, 04:57AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Steve Ward wrote ...

Either terminal can be used as the power source and kelvin source. Internally its a heavy bus bar type connection that solders down to the die, symmetrical to either tab.
Thanks Steve

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