🚀 go-pugleaf

On Jan 26, 9:34 am, Joerg <notthisjoerg...@removethispacbell.net>
wrote:
> m...@sushi.com wrote:
>
> [...]
>
> > Oh cerdips still exist, but I never worked anywhere where the solder
> > on lid type (side braze) was sold to customers. The cerdips have a
> > ceramic lid that looks like the same material as the body. More like
> > this:
> >http://smithsonianchips.si.edu/ice/images/images/5445.jpg
>
> > Ok, I stand corrected. It took me a while, but I found a product that
> > was sold in side braze:
> > AT28C040-20BC
>
> Just opened a random digital parts drawer here, first chip that popped
> up is a TRW image processor. Gray 40-pin cerdip side-braze. Then lots of
> ADCs and whatnot. They look kind of cute with their golden tops.
>
> I've got several here that have a special gold-plated trace run across
> the top and down into the chip to ground the metal cap.
>
> --
> Regards, Joerg
>
> http://www.analogconsultants.com/
>
> "gmail" domain blocked because of excessive spam.
> Use another domain or send PM.

Of course, the side braze package screams "take off the lid and take a
look at me." You want to make life at least a little bit harder for
the chip copiers. Worse yet, it makes it easy for the competition to
probe your chip. [You pull the probe station wafer chuck and slide in
a card with zif socket. It works quite well. Laser off the vapox.]

There is a website out there of "chip art." That is, the junk people
put in the chip just for looks. Most companies will object to anything
not needed in a chip, especially art, since it doesn't meet design
rules. Now of course, your art doesn't have to work, but there are
issues with funny shaped patterns causing resist to peal and
unfortunately fall in the area of active circuitry.

When I was at IDT, we would do minor rev marking in Chinese. I'm sure
the competition figured it out.