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'[EE]: Looking for a connector'
2004\01\15@161529 by Herbert Graf

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       I was wondering if anybody would be able to point me to a connector that
would allow me to play with this goody:

http://sales.goldmine-elec.com/prodinfo.asp?prodid=8258

It says it has a 22 pin flex cable with 0.5mm spacing. I've thought about
soldering directly to the flex cable but would much prefer a less risky
solution. I've tried to search my normal sources but I've having trouble
getting around the search engines, I can't seem to come up with the right
search term. Through whole would be ideal but surface mount would be
acceptable.

Thanks for any help. TTYL

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2004\01\15@162358 by Tom Deutschman

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Check digi-key part number OR690CT-ND, Low profile SMT ZIF 0.5mm-pitch
slide lock.

Tom


{Quote hidden}

http://sales.goldmine-elec.com/prodinfo.asp?prodid=8258

It says it has a 22 pin flex cable with 0.5mm spacing. I've thought
about soldering directly to the flex cable but would much prefer a less
risky solution. I've tried to search my normal sources but I've having
trouble getting around the search engines, I can't seem to come up with
the right search term. Through whole would be ideal but surface mount
would be acceptable.

Thanks for any help. TTYL

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2004\01\15@164550 by M. Adam Davis

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The connectors are available from digikey - search for "flex ribbon" and
make sure you get .5mm pitch.

I will say, however, that hand soldering .5mm pitch connector was the
most difficult soldering job I've ever done.  We did the first connector
with a larger tip and the wet, wipe, and wick method.  There is no
solder mask on this planet, I've detemined, which will keep standard
solder from bridging two adjacent .5mm pins.  I actually removed a trace
on the display to prevent the short that this bridge caused.

After asking around, we found that the MEMs lab might be able to help.
I then mounted the remaining 3 connectors to SMT prototyping boards
using solder paste and an extremely fine pitch soldering iron.  The only
lab here that seemed to have the required stereo magnifier, soldering
iron, and paste was the MEMs lab.  The VLSI lab could have bonded it
with gold wires, I suppose, but their machines weren't set up for it.
It was fun seeing and being able to count the solder balls in the paste
before applying heat.  I believe I used a very fine bladed knife to move
the solder paste around, and wiggle the pins to see if they connected
correctly, after which I used a multimeter to verify the connections.  I
was cross eyed the rest of the day...

Even after all that work I still had two pins  on two different boards
which did not solder sufficiently.  I determined not to fix them (one
for the backlight, one for the touchscreen - we simply didn't use the
backlight).

At any rate, jameco sells prototyping boards from these people:
http://www.beldynsys.com/p504.htm
The board on this page is the one we used.  The connectors were from
digikey.  I'm told that your best hope lies in being able to get a
solder paste template that matches the board, applying the solder paste,
then oven cooking the whole thing.

Good luck!

-Adam

Herbert Graf wrote:

{Quote hidden}

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2004\01\15@171458 by Herbert Graf

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> Check digi-key part number OR690CT-ND, Low profile SMT ZIF 0.5mm-pitch
> slide lock.
>
> Tom

       Excellent, thanks, it's not through whole, but it looks like that isn't a
possibility. I don't know why I couldn't get digikey's search engine to spit
that one out. I guess I was just using the wrong terms. Thanks again. TTYL

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2004\01\15@171859 by Herbert Graf

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> The connectors are available from digikey - search for "flex ribbon" and
> make sure you get .5mm pitch.
>
> I will say, however, that hand soldering .5mm pitch connector was the
> most difficult soldering job I've ever done.  We did the first connector
> with a larger tip and the wet, wipe, and wick method.  There is no
> solder mask on this planet, I've detemined, which will keep standard
> solder from bridging two adjacent .5mm pins.  I actually removed a trace
> on the display to prevent the short that this bridge caused.

       Well I'll give it a go. I've soldered those very small surface mount
resistor packs by hand, not easy but definitely doable. I don't know if they
are 0.5mm pitch, but they must be pretty close to that pitch. FWIW it's this
kind of work where being nearsighted is a definite advantage. TTYL

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2004\01\15@180407 by Josh Koffman

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Herbert,

If you end up needing help, let me know. I've done 100pin flat packs by
hand. I can't promise anything, but I could at least try. I think having
young hands also helps with this!

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
       -Douglas Adams

Herbert Graf wrote:
>         Well I'll give it a go. I've soldered those very small surface mount
> resistor packs by hand, not easy but definitely doable. I don't know if they
> are 0.5mm pitch, but they must be pretty close to that pitch. FWIW it's this
> kind of work where being nearsighted is a definite advantage. TTYL

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2004\01\15@235311 by Jason Harper

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Herbert Graf wrote:
> It says it has a 22 pin flex cable with 0.5mm spacing. I've thought about
> soldering directly to the flex cable but would much prefer a less risky
> solution.

I see that Digi-Key sells matching connectors as "flex connectors" or "FPC
connectors" - see page 50 of the current catalog.

No through-hole versions for 0.5mm cable that I can see, unfortunately.
       Jason Harper

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