s, probably now worth more by weight than anything else on four legs .. I went on Digikey, armed with a data sheet, and there do. NTE Equvilent NTE MOSFET N-CHANNEL DUAL GATE 20V IDSS= 5- 35MA TO CASE GATE PROTECTED VHF AMP/MIXER NTE Data Sheet. Tube or Röhre ID, Transistor, Wires and VHF shown. Radio tubes are valves.

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A part that has been in use for a long period of time has proven its worth. In some cases, part numbers become descriptors rather than absolutes. These publications were our only window into the datasneet of electronic components.

NTE Equivalent NTE MOSFET N-CHANNEL DUAL – Wholesale Electronics

Cordless phones have moved up in frequency, and are using larger scale integration, a lot less datashee for reusing the parts. In general, they still keep the same functionality and numbering-scheme. Definitely not for new in-production designs. I use a as a mixer as it happens, and in my application you start to hear the performance tail off somewhere above 10MHz with the HC part.

All of your bases ARE belong to us. The other camp wanted cheap. Conversely, making inverters cheaper actually has a huge effect on the market. Some FM broadcast band tuners used them, so maybe car datasheeet are a source. Happened to stumble across two of those in my old bag of bits just the other day. 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.

Those were big ones too.

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

Does that mean everyone suddenly needs to not design with through hole parts anymore? Printed catalogs still exist, but the sheer volume of information they contain forces brevity upon their entries and expands the size of the publication to the point at which it becomes an unwieldy work of reference.


The same thing happened datasneet AD acquired 406733 Brown. So that may no longer be a source, especially if you want leads. Notify me of new comments via email. But searching for cow brings up an equally useless list! 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 adtasheet and call it a day.

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. Excessively frustrating… what takes seconds in a catalog takes hours on a webpage. Great article all the same. The 1n34a is such dztasheet part that does not seem to see much need outside of hobbyist radio circles.

No mention of cross-refs…? Others would use the same device, because someone had chosen it. You moved further into the hobby and learned where you could substitute parts, you came to know the familiar solid state devices so you knew that diode was germanium and needed germanium, but that small NPN signal bipolar transistor in an audio oscillator could be just about any small dataeheet transistor, so long as it was NPN, and even then a PNP could often work as long as you made adjustments.

But a cheap opamp was the same part. Redesigning to remove obsolescent components means going back through FAA certification. On the gripping hand, Sometimes I think the FTDI clones got it right; emulate and datashet as the original, name it as the original, and use modern process inside, invisible to the hobbyist.


Circabipolar transistors also had improved noise figure. So I hope that other manufacturers will extend their manufacturing in such a manner. A bit late but anyway, a mosfet like the can be swapped with two N jfets in cascode configuration just like in these example:. Launched in the mists of time when dinosaurs probably still roamed the earth, this static-sensitive xatasheet TO72 found a home in a huge variety of RF amplifiers, oscillators, and mixers.

Leave a Reply Cancel reply Enter your comment here Use those Schottky diodes that arrived in the later sixties, ddatasheet use four if them in a balanced mixer, often a better choice for an overload resistant mixer.

There were always two camps. This site uses Akismet to reduce spam. Sometimes there are components for which there are no perfect replacements. Another example would be lm Pocket money single board computers with real power and easy interfacing. I think TI has it right and they recognized where they needed to be with things. It would be dafasheet to make such a simple choice but in reality there are many times that you have to support 5 Volt systems.

I bought a few last-buys. But datasheef prompted this piece was a far more egregious example of an old component still being specified: Rochester electronics is one such place that will supply parts albeit expensively until the cows come home.