I just came up with a totally cute use for an LM3900.
Alas, the 3900, along with its I-temp sibling the 2900, was discontinued a decade ago. Besides which, what I'd really want would be an LM1900, which, as far as I can tell, never existed in the first place.
Well, maybe an LM159 would do the trick. Except, er, only the LM359 is still around, and C-temp parts just don't cut it. And it's not like the quantity is large enough to get National to make (or qualify, or whatever) a run of 159s. And I don't want to design in a part whose future availability is suspect, anyway.
Oh, well... I wanted it for, basically, a cuteness feature (with some practical application in troubleshooting). A little more looking around for suitable parts may yet be in order, but it's not a disaster if I have to drop the feature.
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