TCA0372 shortage?

That was wrong on rev 9 of the data sheet, issued in 2005!

fredag den 24. juli 2020 kl. 20.21.16 UTC+2 skrev John Larkin:

tributor

onths!

d my

azzafrazza%$&@!!

y voltages

heet

tput

ly

ors

rev 1 1996,

Sure, if it sits still. I'd expect it to walk around a bit, what with being a power op amp and all. ;) (Widlar put a paper in the ISSC one year that purported to prove that monolithic voltage regulators with on-chip pass transistors were impossible due to thermal feedback. Everybody believed it because it was Widlar. Then he came out with the LM109/309.)

Cheers

Phil Hobbs

You really are a very strange person.

Cheers

Phil Hobbs

Maybe Widlar believed it too for a while, hard to say. I get the impression a lot of his designs didn't immediately work as expected which is why he carried a sledge hammer I feel the same way sometimes.

I expect they were mostly named after whomever the sexiest secretaries in the National office was as was the fashion at the time. Aw crap, the Lauren didn't pan out. To the crushing-stump with it.

We met his girlfriend at the bar of the Washington Square Bar and Grille. I can't remember her name.

My bad, that was Atari that code-named their product lines after secretaries.

Seems like the kind of guy who had more than one girl friend. Like Feynman

She was living with him in Puerta Viallarta (sp?) and back visiting her mom. She was worried about his drinking.

He had a tablecloth on the kitchen table with IC drawings under it. She was NOT allowed to look at them.

She was surprised that we had heard of him. She had no idea what he did.

Seems he quit sometime in his late 30s, early 40s maybe? Unfortunately the effects of 20-25 years of alcoholism don't reverse themselves overnight, if ever. It's a sad story in anyone, particularly in creative types. Some give it up and feel they lost whatever it was that made them creative, and some never do. The author William Styron wrote about it:

Alcohol abuse induces paranoia...hard to imagine anyone could design while drunk but maybe he only worked during sober periods. Or he was just that good.

s:

l,

voltage

wide

eal

for DC

a real

t's all

A would

rs or

The motors

set on

loop

hat with

SSC one

with the

s.

es

the

nman

I'm not sure alcoholics are necessarily always "drunk"

The chopamp doesn't undergo the thermal swings of the output amplifiers, though, and the input stage of the TCA0372 does.

National even made a input-stage-only chip to solve that (fairly common) probolem): an LM321 is still available from TI, but it's not the same part at all (just a single of LM324); the old LM321A had differential outputs, offset trim, and was good for 0.2 uV/C offset drift.

My bad, that was Atari that code-named their product lines after secretaries.

Nah. but Widlar doesn't seem like the type of guy who did anything low-key, not the three martini lunch-type. Wasn't drunk all the time, but when he drank I expect he _drank_

So I heard from the ON Semi rep this AM--he got with the factory and says the part isn't going away, but that for somewhat obscure reasons it's "built to backlog" and has always had an anomalously-long factory lead time.

So the net is, buy a reel or use the ST part where applicable.

Cheers

Phil Hobbs

I assume that this means that they don't make a batch unless a sufficiently large backlog has accumulated. Which is another way to say that the demand is low, but not quite so low as to be ignored. Analog folk need to have lots of children.

Joe Gwinn