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40673 Dual Gate MOSFET Replacement

Jun 23rd 2013, 22:03


Joined: May 3rd 2011, 21:44
Total Topics: 0
Total Posts: 0
Does anyone know what can substitute for the 40673? Preferably through hole mount.

I Bet Zack knows.


Jun 24th 2013, 12:58


Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
RCA-40822..4 PIN METAL CAN TO-18 PRICE ...
$5.00 EA.

You might also try any dual gate MOSFET you have on hand--for the typical HF application that appeared in amateur literature, the only significant difference I can think of are the types with unprotected gates that require more care in installation--they are easily blown out by electrostatic discharge.

Zack Lau W1VT
ARRL Senior Lab Engineer
Jul 7th 2013, 19:59


Joined: Oct 22nd 2011, 16:31
Total Topics: 0
Total Posts: 0
Hi Jerry,

The general issue of the availability of dual gate MOSFETs is also discussed a bit
in Experimental Methods in RF Design. on p. 5.12.

If this is for a repair, there is typically NOS to be had on eBay. Search under
"40673 mosfet". Problem is the price plus shipping is kind of high typically.


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