Hi Steve,

my company is using a supplier called NAS or NASTEKA, located in USA. I
just don't have the adress with me because of answering from home. If
the company name is not sufficient, please contact me offline.

They are selling gullwings with different pitches, standoffs, with or
without included solder in the clamp, different fluxtypes and so on.
Pins are solder coated and come from a reel. You have to cut off the
number of pins required and put them onto the lands on the pcb where
they get stuck due to mechanical clamping. Soldering can be done by
reflow or with a hot bar. We use the hot bar and soldering is quite
straight forward.

A big issue with making a pcb a smd-part is coplanarity of the pins. One
point is bowing of the pcb. Another is handling: gullwings are sensitive
to handling due to the feet of them which easy can be bend by touching
with your hand. If you preferably use some kind of machine for cutting
and pushing the pins on to the pcb, be sure to do some testing on this
machine regarding wether this machine is able to transport the pins from
their reel to the cutting knife without bending the feet of the pins and
being able to push them on to the pcb in a centered way. Also outer
dimensions of the pcb are critical if you plan to hold the pcb during
pushing the pins on to it by its outer sides. The edge form of the pcb
is important. Prefer milling, not scribing. Also be sure that the pins
are always perpendicular to the surface. Little angles with higher
standoffs will give you significant deviations of the "deepest points"
of the feet of the pins.

By the way, why do you want to use gullwings? For coplanarity, j-leads
are more suitable. Reliability, as recently read in this forum, is
equal. Inspectability of solder joints should be no issue regarding the
usually high standoffs of the pins (about 3 mm or greater).

Hopefully this helped a little.

U. Korndörfer
ALCATEL SEL AG
Germany

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