I'm looking for one or two of these arrays for a small home project. Yes, I know they're available from China on eBay, but I'd much rather find a couple of vintage (and authentic and working) parts from someone's bin.
There may be other parts that are suitable, but this is the only array I remember where all the devices are fully pinned-out. This requirement is important and excludes LM3046 and similar parts. Device matching needn't be perfect as I can trim it out. The array needs to be junction isolated to ensure that all devices will be at as nearly the same temperature as possible - the old Harris HFA3127 is right out due to its use of dielectric isolation.
Yes, I know it's a high-frequency array and I need to watch out for parasitic oscillations. I've used these before in my day job, but none remain in the parts drawers :(
I'm building a temperature compensating gizmo that needs a current cuber, something I can in theory do as a translinear circuit with 5 transistors, a cheap quad op-amp, and some passives. The process I'm dealing with is exponential but the cubic function is gives a surprisingly good approximation to what I need over my limited temperature range. I'd like to start out with a translinear cuber because translinear is cool, but if that proves troublesome I can use the same array to make a copy of the AD538 - this would allow me to get a non-integer power that would be even more accurate. The real AD538 is still available but seems excessive at over $50 each in small quanitities.
Hmm, I wonder if I can build a 538 clone with a less exotic array like a 3046...
Thanks for any pointers.
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