I went on Digikey, armed with a data sheet, and there do appear I searched on “MOSFET dual gate” and RF Fets, and found a bunch. MOSFET datasheet, cross reference, circuit and application notes in pdf format. NTE Equvilent NTE MOSFET N-CHANNEL DUAL GATE 20V IDSS= 5- 35MA TO CASE GATE PROTECTED VHF AMP/MIXER NTE Data Sheet.

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Hang on, this is Hackaday. The second gate also made it easy to control the gain when used as an RF datsheet. I repaired a big brand audio Amp late last year. Compare that with some power mosfets that seems like if you breathe on them wrong they will expire. Because even today, thirty years after the shuffled off this mortal coil, you can still find people specifying it. Make a circuit with me. Does that mean everyone suddenly needs to not design with through hole parts anymore?

As a non-professional hobbyist, the issue comes from the specification and the tools we are given to compare.

Digikey is one of the better ones, but still inadequate. A part that has been in use for a long period of time has proven its worth. The other elephant in the room is that the military does need parts also. I encourage everybody to design with that part so it will be continue to be made! Extremely useful and they are dirt-cheap. Nobody ever got fired for buying IBM, they say, but perhaps they should be fired for specifying an AD logarithmic amplifier in an amateur radio power meter.


Same goes for capacitors: There are markets where product life expectancy and maintainability are more of concern and this introduces some other dynamics.

40673 MOSFET. Datasheet pdf. Equivalent

Some might say that there is an element of snake oil about the process: The same thing happened when AD acquired Burr Brown. Leave a Reply Cancel reply Enter your comment here I did a little searching — Dons site has a LOT of stuff!

Detector diodes have modern replacements, but power germaniums do not, and I have searched hard!

But what prompted this piece was a far more egregious example of an old component still being specified: As far as I know, those boards are still being built the same way today. Manufacturer names and part numbers would be better. BF, unless my memory fails me.

The Curse Of The Zombie Components That Refuse To Die | Hackaday

Even inI went through an RCA price list and found one that was cheaper, I guess it was the 4N, something like that. I use HC parts as level translators with mixed 3v3 and 5v logic parts because there a good cheap option and do the job well. The window for scrounging is closing. But there do appear to be some parts that I would try to sub for the in an old receiver design: You are commenting using your WordPress.


These publications were our only window into the world of electronic components. No mention of cross-refs…? This all is much harder these days now that parts counterfeiting is a major issue. You are commenting using your Facebook account. The WWW allows us to find what we need in short order, and the miracle of global distribution means that we can have it delivered within 48 hours almost wherever we live.

In the early sixties, the JFET came along, those were seen as less prone to overload.

Most of what Burr Brown was making was carried over to AD with nary a change in part number.