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Chips with built-in RFI protection

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magic:
It's not even remotely comparable to any classic JFET part and it smells a lot like CMOS.

Output saturation curve - straight line, starting from 0V at 0mA. Not only is it R2R, but a bipolar part would typically have some minimum saturation voltage and less output impedance when saturated.
Input offset vs common mode: discontinuous at mid-supply, like in R2R inputs but at a different threshold.
PSRR vs frequency: that one is weird too, equal on both sides.

2N3055:

--- Quote from: magic on August 25, 2021, 06:22:14 pm ---Sadly JRC has nuked most of their jellybean products a year or two ago. I doubt that 072 made it through.

I suppose TI undercut them on price offering parts that more accurately follow the original 1970's specs ;D
I found TI's jellybeans, including OP07, to have more flicker noise than competition. And I'm talking legitimate second source bipolar chips, no "next-generation" rubbish.

--- End quote ---

NJR shows them as active product ..

https://www.njr.com/electronic_device/products/NJM072C.html

They have few thousands of them on Mouser..

2N3055:

--- Quote from: Kleinstein on August 25, 2021, 06:47:34 pm ---The TL072H looks really a bit different than the normal one:  nearly more like an TLE2071.
There are some improvements in some aspects, but not so much for audio.  By todays standard the TL072 is no longer a good choice for audio - more like a low cost OP  that has input common mode range close to the positive supply.

EMI filtering is now quite common with AZ OPs. The ADA4522 has some specs on it.  It is not just the expensive one from Analog, but also cheap ones from Microchip. Chances are that without sich filtering the copper stabilized OPs may be quite sensitve to RF and with increasingly more phones and WLAN this can become an issue.

--- End quote ---

There are still many devices in music world that use them. They are still good enough for guitar amps, even for a first preamp stage... Some pro bass amps (like MarkBass) use them in many models.
Even if you wanted to do better, only first stage would need to be a quieter amp... For tone shaping circuits they are all you need. 

magic:

--- Quote from: 2N3055 on August 25, 2021, 09:54:38 pm ---NJR shows them as active product ..

https://www.njr.com/electronic_device/products/NJM072C.html

--- End quote ---
Interesting, I will have to look at their lineup.

Note that it's a C suffix part. There is something weird going on with certain parts appearing with C suffix in parallel with old ones or after old ones have been discontinued (I can't find the old NJM072 anymore). I first noticed it with NJM5532, where the new variant in SO8 probably involved a die shrink or they would have offered a SO8 long ago. The C variants are only sold in SMD packages while the old ones in all the packages they have always been.

https://www.njr.com/electronic_device/products/NJM5532.html
https://www.njr.com/electronic_device/products/NJM5532C.html
https://www.njr.com/electronic_device/products/NJM4558.html
https://www.njr.com/electronic_device/products/NJM4558C.html

2N3055:

--- Quote from: magic on August 25, 2021, 10:18:37 pm ---
--- Quote from: 2N3055 on August 25, 2021, 09:54:38 pm ---NJR shows them as active product ..

https://www.njr.com/electronic_device/products/NJM072C.html

--- End quote ---
Interesting, I will have to look at their lineup.

Note that it's a C suffix part. There is something weird going on with certain parts appearing with C suffix in parallel with old ones or after old ones have been discontinued (I can't find the old NJM072 anymore). I first noticed it with NJM5532, where the new variant in SO8 probably involved a die shrink or they would have offered a SO8 long ago. The C variants are only sold in SMD packages while the old ones in all the packages they have always been.

https://www.njr.com/electronic_device/products/NJM5532.html
https://www.njr.com/electronic_device/products/NJM5532C.html
https://www.njr.com/electronic_device/products/NJM4558.html
https://www.njr.com/electronic_device/products/NJM4558C.html

--- End quote ---

They are not hiding NJM072C is modern redesign, but specs are very similar to standard TL072 and it is JFET for sure. That one I'm sure would be drop in replacement for classic TL072. In fact they usually have lower noise and are very good.

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