Hi Jinx,
I think it as to do with the junctions and heat dissipation.

Best regards
			Luis



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Jinx
Sent: 25 May 2007 11:24
To: pic microcontroller discussion list
Subject: [EE] Lop-sided FET package

I'm using this FET in a PSU

IRF5800 (109kB)

http://www.irf.com/product-info/datasheets/data/irf5800.pdf

I chose it for the low Ron, and it works fine as a high-side
disconnect switch in the circuit

What I wonder is though, why the package has 4 drains and only
1 source ? You'd think they might have made it 2 & 3 or 2 & 2

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