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 would add my own observation that datasyeet digital logic can be done with NAND or NOR gates alone, analog can be reduced to relatively few parts as well. Just an example off the top of my head, nothing against AD parts in general: They wanted to use what they had, or what they could scrounge.
Other things came long.
I used it a fair bit. Leave a Reply Cancel reply Enter your comment here Does that mean everyone suddenly needs to not design with through hole parts anymore? Now all this said there is perhaps a different case for the ol TL and datazheet likes but still they are cheap.
Some might say that there is an element of snake oil about the process: What the full-blown rant in the previous paragraphs has been building up to is this: Then there are the truly weird parts that may not see the light of day again. Which I think was not particularly good. People probably mosfey old components because. Rochester electronics is one such place that will supply parts albeit expensively until the cows come home. Dataaheet a 1N82 if you wanted better frequency response, thy were found in UHF tv tuners.
MOSFET datasheet & applicatoin notes – Datasheet Archive
Someone would pick a device based on specs or availability, and write about the project. 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. So who knows, there might be a demand for them again! Make a circuit with me. An alternative is that the parts places somehow chose certain parts, which then found their way into projects.
In the early sixties, the JFET datasheer along, those were seen as less prone to overload.
They are an elegant solution for what is needed. I want to search for a connector that is small with 14 pins. Unless you want to, that is. 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 same thing happened when AD acquired Burr Brown. Which exactly are the parts that have superseded the 74HC?
I would say every through-hole part in the world is on the verge of being eliminated. Balanced mixers had advantage. Pocket money single board computers with real power and easy interfacing. But perhaps that meant stock. BF, unless my memory fails me.
An Apple I replica like the Mimeo 1 needs old logic chips for artistic purposes. Yes, noise figure factored in, at least if you were doing something on VHF or higher.
40673 MOSFET. Datasheet pdf. Equivalent
Excessively frustrating… what takes seconds in a catalog takes hours on a webpage. OK, maybe germanium diodes are an edge case and the examples above have a radio flavour, but you get the picture. Redesigning to remove obsolescent components means going back through FAA certification.
As a mixer with LO input: They needed to know what was going on in the circuit, and the general specs of the semiconductors. I moset your datasheft not because the criticism is correct, but rather it is an accurate observation about the lack of part availability.
I think all your points are valid [AussieLauren] and they are perhaps more valid than you expect. That mosffet is everywhere and not very many others can run off a single supply which the lm was famous for. As a non-professional hobbyist, the issue comes from the specification and the tools we are given to compare.
MOSFET Datasheet pdf – Equivalent. Cross Reference Search
Circuits in the maker and hobbyist arena have a nasty habit of sticking around, regardless of how good they are. BTW, for anyone who has to deal with a 3n, observe every ESD datasheet in the planet with that part because they are extremely susceptible. Even inI went through an RCA price list and found one that was cheaper, I guess it was the 4N, something like that.