723 regulator trivia question

"hrh1818"

But the number is uA723 - so it must be a Fairchild device.

Suspect it might have appeared a couple of years earlier, from them.

..... Phil

My junk box has a couple from Texas and Motorola with 1973 date codes.

uA makes it a Fairchild part and I would guess 'introduced' 3 or 4 years earlier.

A Teledyne databook cross-ref list of pin-for-pin equivalents, dated Oct 1974 shows:

National Semi LM723H, LM723CH, LM723CN-14 Motorola MC1723G, MC1723CG, MC723L, MC723CL Fairchild uA723HM, uA723DM, uA723HC, uA723DC Teledyne 723BE, 723BL, 723CE, 723CJ, 723CL

I've found a reference to it being designed by, or at least the idea for the Fairchild 723 originating from a "P.Wyndham Little". No date though, just a reference to the 1960's.

Dave.

Fairchild, 1968, I gather.

Jon

I also gather it was the first integrated circuit made generally available.

Jon

Look no further than the venerable Art of Electronics:

Dave.

Acording to Wikipedia it was the famous Bob Widler:

Dave.

"Jon Kirwan"

The first *op-amp* made generally available was the Fairchild " uA702 " released in 1963, followed by the famous " uA709" in 1965.

(source: IC Op-Amp Cookbook, 2nd Ed )

Other, simpler ICs were available even earlier.

..... Phil

According to this oral history the 723 was designed by a Darryl Lieux: http://74.125.95.132/search?q=cache:8VNPMT7E9-gJ:archive.computerhistory.org/resources/text/Oral_History/Fairchild_at_50/102658281.05.01.acc.pdf+bob+widlar+723&cd=4&hl=en&ct=clnk&gl=au

So perhaps that's now the trivia question, who actually designed the 723?

Dave.

Thanks. That's interesting.

Jon

"hrh1818"

That's bit of IC trivia for ya !!

.... Phil

Fairchild Semiconductor published the first application notes in 1968 which included a fairly comprehensive analysis of voltage references and their temperature coefficients. First datasheet i have has the same date.

I remember those having a high failure rate and go into full output.

At one time, I had a series of units employing that component that seem to die into a full output state with strong EMF near by.

May have been all from a single manufacture.

Thanks Pros for all of the interesting answers to my question

Howard

"hrh1818"

Thanks Pros for all of the interesting answers to my question

Howard

.... Phil

There are some errors in the article. The uA709 and uA741 were the parental generation. Not the LM101. Guessing that Fairchild was numbering parts nearly sequentially the uA723 would be from about