THE CHALLENGE
I received some samples of NXP NFC ics with I2C and was trying to figure out how to get one working quickly.
Silly me chose to solder wires to it. The package is a XQFN8 1.9mm x 1.9mm, no lead, 0.5mm pitch
After looking at several types of wire laying around the lab, I chose to use 30 AWG (0.255mm) Kynar wire wrapping wire.
Three wires next to each other seemed to be a perfect fit for the pads on the chip.
MAKING WIRE WRAP RIBBON CABLE
After stripping the insulation from three wires, I carefully lined up the three ends of the insulation and applied a drop of cyanoacrylate glue to the insulation
to make a tiny ribbon cable. Then I carefully trimmed the ends at about 2mm from the insulation end. Then I tinned the wires with a tiny amount of solder.
MAKING A SOLDERING IRON TIP
I wrapped a length of bare wire around my soldering iron tip and sliced the edge to a knife point to make a tiny soldering tip.
SOLDERING
Under a small magnifying glass, I laid the wires on the pads and heated them with the tiny iron tip.
NOW FOR THE OTHER 5 WIRES.........
I had some issues with the last try, so this time I glued all the parts in place on a glass slide before trying to solder them
Here's the image from the microscope
It's not pretty, but it should be functional.
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