TCA0372 shortage?

We have 2100 in stock, so I can spare you a few.

I'd hate for this to go EOL. I just designed it into our new delay generator. It makes programmable VH and VL for my GaN totem pole.

Thanks! I ordered 100 from Digikey, which will hold me for prototype quantities. I emailed the East Coast sales manager, so we'll see.

Cheers

Phil Hobbs

Can you use alternative? For instance, lm358 is cheaper and available.

Incidentally, it seems to be c-load stable with a 56u polymer. I'm adding a 1 ohm series resistor, out of excess caution.

But doesn't source and sink an amp. The TCA0372 is a unique part--it's like a four-quadrant LM317 with much lower dropout voltage.

Cheers

Ph

That's what I usually do. You might want to scope the supply pins to see if it's got a low amplitude, high current oscillation without the resistor.

Cheers

Phil Hobbs

A 8 pins, 10 cent lm358 plus buffer (FET or darlington) is still cheaper and smaller than the $1, 16 pins TCA0372.

Just a suggestion.

OK. I have five duals on two shared pours, +24 and -8.

Could get interesting!

Thanks.

Making it four-quadrant takes significantly more parts than that, though, plus there's the class-AB bias current issue to worry about.

I could use an LM675 or OPA551 to make the floating ground and an LM337 upside down to make the floating 'negative' supply, but that's more cost and board space than a 48-cent TCA0372 dual.

Sure hope ON Semi doesn't stop making them anytime soon.

Cheers

Phil Hobbs

Thanks.

Making it four-quadrant takes significantly more parts than that, though, plus there's the class-AB bias current issue to worry about.

I could use an LM675 or OPA551 to make the floating ground and an LM337 upside down to make the floating 'negative' supply, but that's more cost and board space than a 48-cent TCA0372 dual.

Sure hope ON Semi doesn't stop making them anytime soon.

Cheers

Phil Hobbs

We're paying 44 cents for the dual. There's nothing like it. An opamp with discrete buffers would be a lot of parts without the thermal limit. Probably wouldn't swing as far either.

The nearest immediate sub is the LA6500, bigger package, more dissipation, worse slew rate and GBW etc.

Also, unrelated, I found these:

RRIO, 120 MHz, 180V/usec, 0.3p bias current, 6.5 nV/sqrtHz. About 40 cents in quantity for the single, could prolly find a use for those

also source 100mA min and 300mA typ, y'know a quad is probably a bit over a buck and in parallel would be nothin' to sniff at.

So long as 5.5 volts top end is cool.

I was going to suggest the lm675, but on octoparts the cheapest (lm675) are from Rochester electronics... never a good sign.

George H.

torsdag den 23. juli 2020 kl. 20.15.24 UTC+2 skrev Phil Hobbs:

for 20V wouldn't this be an alternative?

Looks good but they seem a bit un-confident about the offset voltage spec...???? it's usually somewhere in there

Awesome, thanks! It has the same pinout, and for lower supply voltages it might well be interchangeable. I'll get some and see.

Cheers

Phil Hobbs

page5: input offset voltage -/+10mV ?