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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I bought a few last-buys. But what prompted this piece was a far more egregious example of an old component still being specified: One wanted to be able to buy the exact parts specified, preferably at Radio Shack. And connectors seem to be not a focus of theirs in mosfwt way semiconductors are. Compare that with moscet power mosfets that seems like if you breathe on them wrong they will expire. What the full-blown rant in the previous paragraphs has been building up to is this: At the time, there was an upstart on the scene: Some FM broadcast band tuners used them, so maybe car radios are a source.
Cordless phones have moved up in frequency, and are using larger scale integration, a lot less useful for reusing the parts. Is there even the vaguest hope of something like that for FPGAs?
Granted, the AD part is a much better chip. Get a 1N82 if you wanted better frequency response, thy were found in UHF tv tuners. There was a vast selection, but hobbyists used a small subset, because the hobby suppliers were easier to del with, as well as the ubiquitous Radio Shack.
Some might say that there is an element of snake oil about the process: To that end you can find more than one manufacturer of these parts that seem to have an eternal need. My understanding is that they have a reasonably good NF and they allow you to build a combination mixer-amplifier in a single device. Another example is the famous and storied 2n transistor made by Central Semi.
Zombie components are alive and well in the aviation world. And people wonder why I hoard old analogue TV tuners. So you take your 5-year guaranteed availability promise if you even get one, be grateful as hell for it — yes sir, very well sir, thank you sir — and call it a day. The data sheet does not specify a blast shield.
As a mixer with LO input: Launched in the mists of time when dinosaurs probably still roamed the earth, this static-sensitive four-pin TO72 found a home in a huge variety of RF amplifiers, oscillators, and mixers. People probably specify old components because; 1 they work, having been seen in a similar circuit before 2 they were available, having been used before On the gripping hand, Sometimes I think the FTDI clones got it right; emulate and package as the original, name it as the original, and use modern process inside, invisible to the hobbyist.
Something curious happened with the recent TI acquisition of National Semiconductor. Manufacturer names and part numbers would be better. Because even today, thirty years after the shuffled off this mortal coil, you can still find people specifying it.
I would add my own observation that if digital logic can be done with NAND or NOR gates alone, analog can be reduced to relatively few parts as well. It completely fails at about 70MHz.
NTE Equivalent NTE MOSFET N-CHANNEL DUAL – Wholesale Electronics
Most of what Burr Brown was making was carried over to AD with nary a change in part number. And I love my germanium diodes — they allowed me to listen to crystal radio when electricity was out, and batteries were expensive or unobtainable. I thought someone kept making germanium, but it may be as much as twenty years since I heard that.
Those people probably bought the kit if it was available. Same goes for capacitors: They apparently have the capability to run a line for the day to get a few thousand chips and inventory them and put them up for sale.
Not all markets are like this. You had to buy the kit, or hope the author would supply the IC. The most expensive single chip I use today is 40637 AD Just an example off the top of my head, nothing against AD parts in general: My EE course tried to teach me to be an EE academic more than dataasheet did a professional engineer. The big daddy of dead datadheet reference was the Thomas Msfet Which I think was not particularly good.
That line was ambiguous.
40673 MOSFET. Datasheet pdf. Equivalent
Yes, noise figure factored in, at least if you were doing something on VHF or higher. I sure hope not!. The other camp wanted cheap.