[Elecraft] Through-hole Replacement for K3 Q5 (2N7002)

[Ken K6MR]

The Fairchild/On Semi data sheet is common to the 2N7000/2N7002/NDS7002A.  There are some differences in the maximum ratings, with the 2N7000 good for more continuous drain current (probably due to the TO-92 package).  They all have the same drain-source breakdown voltage (60V).

I’m assuming this is Q5 on the main RF board.  The active device parameters are different but not enough to worry about in the circuit where Q5 is used.  It is nothing but a switch to reverse the active state of the 7R line to activate the big FET used for the Key Out line.  The 2N7000 will be fine.

Ken K6MR

From: Pete Smith N4ZR<mailto:pete.n4zr at gmail.com>
Sent: Thursday, October 21, 2021 06:56
To: Elecraft List<mailto:elecraft at mailman.qth.net>
Subject: [Elecraft] Through-hole Replacement for K3 Q5 (2N7002)

The original surface-mount part seems to be back in stock in the US, but
I'm afraid that what I need is a through-hole equivalent, because the PC
board where the old one was mounted is a wreck (damage from part
failure, plus my ham-handed efforts to replace it). Google thinks a
2N7000 will do, but I'd sure like to get an expert opinion.

--
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at <http://beta.reversebeacon.net>.
For spots, please use your favorite
"retail" DX cluster.

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