I need a bunch of TL072 and I'm considering the NJR NJM072BD.
I've compared the data sheets and haven't found any obvious discrepancies. Some of the "typical" figures differ (E.G. the CMRR and SVRR : 100 dB at TI, 86 dB at ST and 76 dB at NJR) but how much of that is real and how much is different definitions of "typical" ?
The NJR data sheet is much less detailed than the other two. It avoids mentioning crosstalk completely, for instance.
Good idea ? Bad idea ? Does anyone have any experience with those NJR chips ?
If you're going to use them for "typical" TL072 stuff (jellybean audio, not real-low-noise, DC stuff where the offset doesn't matter much, etc.) then they're just fine. IIRC they are the cheapest TL072-alike from Mouser.
If you're so price sensitive that you're buying the cheapest ones you can find then I'm assuming you don't need platinum-iridium-standard level instrumentation or audio op-amps.
Well, it was a pretty good one 25 years ago. And it's just as good today, just that there are other parts that I'd use instead (not just specsmanship but also supply rails and ESPECIALLY output current capability if driving any kind of line) if I were building a one-off.
NJM072BD is Mouser's cheapest TL072-alike. You can buy other manufacturer's C-grade but they'll cost more.
I honestly don't know if NJM's "B" means cross-compatible with other manufacturer's "B-grade".
The NJR spec sheet is a little odd claiming that their 072B is drop-in compatible with everybody else's 072's, while their 072-non-B is optimized for AC application but unstable to oscillation as a voltage follower (e.g. fundamentally NOT like everybody else's 072 when it comes to internal compensation.) My interpretation is that their
Uh-oh... This question is a tell-tale sign that you're not familiar with those parts... Despite its name, the NJM072 is not equivalent to the TL072[C]. Its slew rate is 20 V/=B5s. It's not unity-gain stable.
The NJM072B is roughly equivalent to the TL072[C] with a slew rate of 13 V/=B5s.
NJR do not offer any TL072A or TL072B equivalents that I know of.
To answer Tim's question : my interest in the NJR parts is not motivated by price. TI's TL072CP are cheaper. The reason is that the NJM072* are the only non-RoHS TL072 still available from Mouser.
Those parts are going to be used in various synth modules. The synth-DIY community seem to have standardised on the TL072 as a generic op-amp. If they need precision, they'll use an LT1013. If they need low bias current, they'll use an LF412 and so on. They use the TL072/74 for most of the rest. Non-critical CV, unity-gain audio...
I just want to make sure the NJR part is not egregiously bad. For instance, if the crosstalk really is 25 dB worse than a TL072, some circuits designed for the TL072 might start misbehaving.=20