Hi Jim,
I've come across similar application and similar lead pitch on surface mount
flex cable. The key is to get the design right the first time. Here is my
two cents on this subject:
* 0.5 mm is pretty tight, I would suggest you to add some tooling
holes on both the board
and the flex, if possible . Your operators will appreciate the ease
for alignment later.
* To ensure ease of inspection and repair, the pads should be slight
longer than your
regular design.
* I did a survey on TechNet several years ago on hot bar (see
attached posting), hope that helps.
Good Luck!!
Mike Yuen
****************************************************************************
****************
Date: Fri, 21 Jun 96 14:12:00 CDT
From [log in to unmask] Fri Jun 21 15:28:58 1996
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Subject: HOT BAR SUMMARY
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X-Status:
Thank you for all your responses on this subject!!
I summarized the responses and created a small list of vendors and reference
material that might be useful to some of you. I am still looking for more
information on this subject and would appreciate your comments and
suggestions. A group reported a 30,000 PPM defect rate with hot bar
soldering. I wonder if someone can comment on this!!
Crtical Factors to consider for Hot bar Application:
- Cycle Time
- Temperature Control
- Loading Mechanism (alignment)
- Pressure Control
- Tip Life
- Programming
Potential Vendor
Teka Interconnection Sys. (401)-781-5730
Unitek Miyachi (818)-303-5676.
Palomar Products (619)-931-3622
Todco General Inc. (619)-549-9229
Pace Miniwave (???)
Literature Reference
"Development in Hot Bar Reflow", by Larry Robert Circuits Assembly, Aug.
1991
"Fine Pitch Hot bar Reflow with low temp solder and thick PWB", by Donald C
Burr, Nepcon West 1992
"Hot Bar Lead Attachment Process Optimization for TAB OLB", by Foo- Ming Fu,
Larry Dodson, IEPS 1991
You may also try the following web sites:
PCMCIA sponsored PC CardLink
http://www.pc-card.com
http://www.pc-card.com:80/
AMP's web
http://www.amp.com/
SanDisk
http://www.sandisk.com/sd/educate/abc_gen.htm
Thanks
Michael Yuen
> -----Original Message-----
> From: West, Jim [SMTP:[log in to unmask]]
> Sent: Tuesday, September 14, 1999 4:10 PM
> To: [log in to unmask]
> Subject: [TN] Soldering .5 mm flat flex to PCB
>
> Hi Techies,
>
> I have an application that will require me to attach a .5 mm pitch, 41
> position flat flex cable to a rigid PCB. Our customer is working with a
> flat flex supplier as well for the application and they told them that
> they
> will apply the cable to the board by some type of heat plate or bar that
> will process the solder and join the cable and PCB pads together or they
> will insert the cable conductors into vias and solder them to the PCB. I
> don't know if anyone can help me on this, but I want to know if any of you
> know anything about this type of process? Is there equipment that I can
> purchase to apply a flat flex cable to a PCB? The cable has such a small
> pitch that I'm not sure how I can insert them into vias or through holes
> without causing a quality issue. Any help would be great, if more
> information is needed, let me know.
>
> Best Regards.
>
> Jim West
> Manufacturing Engineer
>
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