Hi Steve,
there is something you should consider about CCGAs, and that is $$$!!! You
must read this literally and make sure that everybody in the company, from
the Incoming inspectors, through the kitting persons and to the operators
know it. If you run a small prototype batch, contact the supplier (or worse,
the broker) and make sure the parts come in the original trays and they are
properly strapped. If you end up getting the parts in hand made boxes,
because the broker divided the stuff from one tray between several
customers, there are big chances that you get them with bent leads. And if
the leads are bent more than 10 degrees, they exceed the elastic zone and
there is no point in trying to straighten them up, the reliability is gone.
Of course, they are reworkable, the manufacturer can replace the columns,
but the cost is almost like buying new parts.
Besides that, make sure that the design of the land pattern complies with
the guidelines in the IBM document you have. We once had to assemble on pads
that were a lot smaller and don't ask me how I had them pass the QA.
Assembly concerns:
- if you cannot see the leads during machine inspection, a tough job, since
the body is white, go with the body check, you can't miss
- some packages are pretty high, more than the 10mm that Fuji moves around
with the regular 26mm long nozzles, so, if you have some IP3s, or if this
applies to your machines, you might have to buy the shorter nozzles.
That's pretty much it. No other particular concerns, other than making sure
the side with this part is the last one to assemble, hehehe. Or the good old
DFM.
Have fun,
Ioan
> -----Original Message-----
> From: Stephen R. Gregory [SMTP:[log in to unmask]]
> Sent: Monday, November 19, 2001 7:23 PM
> To: [log in to unmask]
> Subject: [TN] CCGA's, the good, the bad, and the ugly...
>
> Hi all!
>
> May be getting the opportunity to assemble some boards with CCGA's on
> them.
> Don't have any direct experience with these puppies. Downloaded IBM's
> application *.PDF on assembling and reworking them (it's pretty good by
> the
> way), and seems that basically, you would do the same thing assembling
> these
> guys as you do when working with BGA's...am I over-simplifiying things too
> much?
>
> Any advice, or "gotcha's" I should look out for would be appreciated...
>
> As always, thanks a bunch!!!
>
> -Steve Gregory-
>
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