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Old 12th Jan 2017, 11:27 am   #20
jimmc101
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Join Date: Mar 2009
Location: Portsmouth, Hampshire, UK.
Posts: 674
Default Re: 2N3819 Mosfet

I agree that Source and drain are interchangeable.

The 'Siliconix FET Design Catalog' 1982 shows the chip layout as completely symmetrical.

A point I had not noticed before is that two completely different chip layouts are given for the 2N3819!
One 'NP' is also used by the 2N4416 etc and the other, 'NRL' by the 2N3823 etc.

I can only assume that the specification of the 2N3819 is so wide that either chip will meet it and that they used whichever they had a surplus of.

Jim
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