Phil,

We've just did it. A 1"x1" VCO soldered on top of a main board. I don't know
how will your joining technology be, ours was that the VCO is bumped,
therefore turned into a sort of BGA.

Good luck,
Ioan

> -----Original Message-----
> From: Phil Nutting [SMTP:[log in to unmask]]
> Sent: Friday, October 01, 2004 10:56 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] stacking PC boards and reflowing together
>
> So it has been done.  Cool!  Now to "design it in" on our product.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Genny Gibbard
> Sent: Friday, October 01, 2004 10:51 AM
> To: [log in to unmask]
> Subject: Re: [TN] stacking PC boards and reflowing together
>
>
> We tried this with a piece of Rogers4003 on top of FR4.  The surfaces
> being
> soldered together were almost solid ground plane, so we had a checkerboard
> pattern of soldermask/solderpaste, in order to help it line up when the
> solder reflowed.  I think the assemblers also put a piece of buss wire
> through two lined up vias on each board, before running it through the
> oven,
> to keep the boards from sliding around.
> I think it worked OK, but it was several years ago and the product never
> took off so it wasn't a high volume run.
>
> -----Original Message-----
> From: Phil Nutting [mailto:[log in to unmask]]
> Sent: October 1, 2004 7:24 AM
> To: [log in to unmask]
> Subject: [TN] stacking PC boards and reflowing together
>
>
> Good morning,
>
> Has anyone tried reflow soldering one circuit board on top of another as
> if
> the top board were just another SMT part?
>
> We have a design where we currently design this as thru-hole boards and
> attempt to solder them together... sometimes three boards high, which
> never
> works to my satisfaction.
>
> Phil Nutting
> Manufacturing Engineer
> Kaiser Systems, Inc.
> 126 Sohier Road
> Beverly, MA 01915
> voice 978-922-9300, ext. 2315
> fax 978-977-3018
> e-mail [log in to unmask]
> www.kaisersystems.com
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> -----------------------------------------------------
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> -----------------------------------------------------
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> -----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------