How do you do double sided PC boards with SMT on both sides. Will surface tension hold the SMT parts on the upside down side when you reheat?
Bill WB5TCO
Bob Fish K6GGO wrote:
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Hi Guys,
I don't know about the skillet, but the toaster oven reflow technique is
getting to be very popular with home
hobbyists. You can buy solder paste in a syringe for easy application.
Apply a very small amount of solder paste to the pads, then stick the
component
in the paste. After filling the board with parts you put it in a toaster
oven and soak it at about 200F for 3 or 4 minutes (to alieviate thermal
stress) then ramp it up to 410F or so. Then turn off the oven and open
the door. You can get exact temperature profiles (temp vs time) from the
manufacturor. It works great. One of the nice parts is the component
will straighten itself on the pads due to the surface tension of the
solder. Do a google search for "toaster oven reflow". Here is the link
that I learned the method from:
Bob K6GGO
Monty N5ESE wrote:
Just looked at the "skillet" reflow description. Question: How does
this
accommodate the usual component manufacturer's spec of maximum 350 deg C
for 3 seconds? My experience is that surface mount capacitors and
resistors delaminate with extended heat. semiconductors are generally
rated for junction temperatures to 150-200 deg C, and this technique
will
surely exceed even that. I suspect plastic IC's are even more
susceptable. Maybe I'm missing something obvious.
73,
monty N5ESE
At 07:56 AM 1/31/2006, John H. Fisher wrote:
Wow, Bill, thanks very much :-) What an interesting article. I've
always
wondered how you solder those pinless packages. Best Wishes on your
small parts, too. You've given me new hope :-) Take Care and thanks
again for all your work on the Xylo-SDR project :-)
Regards,
John
Bill Tracey wrote:
Chips with pins, what a luxury!
The latest hobbyist challenge I've got is this puppy:
No pins on this sucker! Think I may have to go the 'skillet
reflow'
(
) method to get this chip attached.
Actually - congratulations on getting your 64 LQFP guy down -- they
can be tough -- especially on a board w/o solder mask.
Cheers,
Bill (kd5tfd)
At 10:02 PM 1/30/2006, you wrote:
--
Regards,
John
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