Electronics > Projects, Designs, and Technical Stuff

78H05

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Alex Eisenhut:
Yeah I have lots of standard 3 amp TO-3 parts like the LM323K, seems 5 amps was unusual back then.

dannyf:

--- Quote ---I'm curious what that means.[/quite]

"Hybrid" for a while meant thick film parts - kind of like smd parts in a small package.

Most 78Hxx implementations are the regulator chip + a discrete (in die format) pass element.
--- End quote ---

SeanB:
I still have **somewhere** a few 78ASC regulators in a 4 lead TO3 package. Next time I see them I must undo one from the heatsink they are on and introduce it to the grinding wheel and some coolant. Then pop it under the microscope and get some images of what is inside. They came from a coin counter I bough a decade or so ago as part of an auction lot. Came with an IBM minicomputer I used as parts. Still have the SMPS panel from that somewhere, massive casting with assorted converters on it.

Andrew Morton:
Make sure to check the data sheet before opening a 78-series voltage regulator in a TO-3 package. Some of them used beryllium oxide inside, which you want to avoid. (The 78HGKC definitely did.)

Yansi:
So what? You are not going to grind that beryllium ceramics, are you?  :)

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