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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People probably 4073 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.

I am guilty of rarely using op amps, and replace them with transistors whenever possible: And people wonder why I hoard old analogue TV tuners.

So that may no longer be a source, especially if you want leads. Datashedt connectors seem to be not a focus of theirs in the way semiconductors are.

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

It would be nice to make such a simple choice but in reality there are many times that you have to support 5 Volt systems. This is probably leftover from my war years: So I hope that other manufacturers will extend their manufacturing in such a manner.

In some cases, part numbers become descriptors rather than absolutes.

Redesigning to remove obsolescent components means going back through FAA certification. Others would use the same device, because someone had chosen it.

There is of course also a slightly macabre alternative scenario. I use HC dattasheet as level translators with mixed 3v3 and 5v logic parts because there a good cheap option and do the job well. BF, unless my memory fails me.


The beginner was at the mercy of the parts list, buying that expensive Datasheett IC because he wanted to follow the article exactly out of fear of making a mistake, not realizing the author specified that HEP replacement line part because it was very available.

Because radios are now becoming all microprocessor and nothing else, does that mean that someone should stop designing mixers using transistors?

40673 MOSFET. Datasheet pdf. Equivalent

Detector diodes have modern replacements, but power germaniums do not, and I have searched hard! Someone would pick a device based on specs or availability, and write about the project. The window dataheet scrounging is closing. There are markets where product life expectancy and maintainability are more of concern and this introduces some other dynamics. How times have changed.

And you can go from e. The specific reason that most of your criticism is not correct is because there are some numbers and parts that are so perfect for their required design purpose that it seems more work or cumbersome to redesign using modern parts. I personally do not understand why this part did not take off other than it is so datasheeet gone hard to understand how they should work! If I specify a transistor with a low price and an equivalent substitute I can be sure that my employer will be able to buy that part well into the future.

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I guess it comes down to what you mean by replacement. All of your bases ARE belong to us. Those were big ones too. Is there even the vaguest hope of something like that for FPGAs? Just an example off the top of my head, nothing against AD parts in general: You had to buy the kit, or hope the author would supply the IC. Sometimes there are components for which there are no perfect replacements. Given these are devices from a past generation, the BF others mentioned certainly seems to fill the bill for a replacement and you can buy them by the bag-full from the usual Asian suppliers.


The big daddy of dead tree reference was the Thomas Register: Email required Address never made public. They contained significant excerpts from semiconductor data sheets, and we read their wealth of information from cover to cover. Inverters are a percentage of the hardware cost of a PV installation, and getting that price down DOES directly correlate into more rooftop solar.

Now all gone, the average cellphone today has no useful parts. Something curious happened with the recent TI acquisition of National Semiconductor.

Manufacturer names and part numbers would be better.

The Curse Of The 40673: Zombie Components That Refuse To Die

Higher performance mixers like a diode double balanced mixer would likely require way more components as well as an extra RF amp stage and a diplexer. Other things came long. You are commenting using your WordPress. This is not feasible for hobbyists and datasheeh from other fields. But in all fairness, still a dodo of a component. I only buy 1 nF, 10 nF, nF etc. What the full-blown rant msofet the previous paragraphs has been building up to is this: The most commonly seen alternative NE is probably equally suitable, but a bit more expensive.

But a cheap opamp was the same part. Learn how your comment data is processed. But perhaps that meant stock. Leave a Reply Cancel reply Enter datxsheet comment here The second gate also made it easy to control the gain when used as an RF amplifier.

The other camp wanted cheap.