Greetings dwellers of SED: I was recently going through a datasheet and came across an oddity of a package. It's called a "ceramic dual flatpack" (page 11:
Can anybody tell me what this package type is used for?
Thanks,
-Michael
This is a military-grade package going back to the 60s. You used a special die in a press to form the leads and then you weld, yes, weld, the leads to the PCB. Early digital computers in missiles were built out packages like these.
The last one has a link to a fascinating powerpoint presentation.
Wirewrap?
Martin
When I used these packages back around 1990 we used our own special die to shorten and form the leads for surface mounting, then just soldered the package to our PCB as if it was a regular surface mount package. It worked fine.
-- Bill Sloman, Nijmegen
Yeah, I guess I should have said you *may* weld them if your application needs it. Apparently missiles needed it, or maybe soldering wasn't judged reliable enough at the time. It's a pretty serious heavy-duty package at any rate.
No.
Cheers! Rich
Michael snipped-for-privacy@gmail.com posted to sci.electronics.design:
Presuming that you are talking about the "W" package, that is the old standard "flat-pack" without preformed leads. It is intended for surface mount after lead forming. It is an out of date package style dating back to the early 1970's or so.
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