[SI-LIST] Re: High IO 1mm Pitch FPGAs Top Bottom Board Assembly
- From: Lum Wee Mei <lweemei@xxxxxxxxxx>
- To: harjeet.randhawa@xxxxxxxxxxxxxxxxx
- Date: Fri, 16 Jan 2004 11:25:59 +0800
Hello,
Can't keep my hands off the keyboard.
I am not a assembly gal but I have heard that pallets are used to
support them at the bottom to prevent them from falling regardless with
or without heat sink.
Regards,
Wee Mei
Harjeet Randhawa wrote:
>Hi Jeff,
>
>No there r no heat sinks. But I doubt how will they prevent such big
>device from falling/moving once getting RE-Reflowed. There is no place
>to put even some glue below.
>
>Regards,
>Harjeet.
>
>-----Original Message-----
>From: Jeff Seeger [mailto:jseeger@xxxxxxxxxxxxxx]=20
>Sent: Thursday, January 15, 2004 8:15 PM
>To: Harjeet Randhawa
>Subject: Re: [SI-LIST] Re: High IO 1mm Pitch FPGAs Top Bottom Board
>Assembly
>
>
>,
> Harjeet,
>
> One major concern regards the weight of the FPGA package.
> When the second side is assembled, the first side will be
> reflowed too. If the package has a heatsink you may be in
> for a rude awakening. By all means you need to have your
> physical design group fully in touch with your fabrication,
> assembly, and test resources.
>
> Best regards,
>--=20
>=20
> Jeff Seeger Applied CAD Knowledge Inc
> Chief Technical Officer Tyngsboro, MA 01879
> jseeger "at" appliedcad "dot" com 978 649 9800
> offering pcb design, fabrication, and assembly services
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