Hi Steve,
I worked on the development of something like this a while ago. We chose
pins that could 'float' by about 20 thou (mils) and the ends to be soldered
were rounded. The floating allowed for coplanarity issues and the rounded
ends allowed a deeper solder joint. We didn't make many but they soldered
OK.
By the way, the light in the tunnel is probably some blighter with a torch
bringing you more work!
Regards
Eric Dawson

> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Thursday, March 21, 2002 1:04 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] PGA to SMT sockets...
>
> Hi Kerry,
>
> This isn't a BGA socket, but actually a Pin Grid Array (PGA) socket that
> is mounted to the board to surface mount pads that looks like a BGA
> footprint. This socket must be used due to the pin design that will accept
> a through hole Pin Grid Array device.
>
> I've never seen anything like it before...got some new material for my
> dreams...errr, I mean nightmares...hehehe.
>
> Did one experiment today trying out a few things...placed and soldered
> one, it didn't look too shabby! The real test is tomorrow....
>
> I think I'm seeing some light at the end of the tunnel...or is that the
> headlight from the train heading towards me?
>
> -Steve Gregory-
>
>
>
>       Hi Steve,
>       I would suggest you stay away from that type of socket.  Try
> Advanced Interconnect.  Their socket has balls instead of machined pins.
> Tends to work a lot better for us.
>       We use them when we know a die will be respinning and we want to try
> a few new ones out quickly before we place a whole lot of BGA's directly
> to a PCB.
>       As far as reflow profile.........  we use the same as what the board
> normally has if we are going to place say 10 - 20 of the sockets.
>       As far a pad size.  We use the same dia pad as the ball.
>       We use Circuit Tech (Jeff Ferry's place) to place the socket for us
> in small lots or quick turn.  We also use them to mount the new BGA to the
> adapter that will plug into the socket.
>       Hope this helps,
>       Kerry
>
>
>
>
>

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