On 3/12/15 8:55 AM, Joshua Noble wrote: > I don't want to ruin the board and one of my NRF905s without a > seeking some wisdom first. Has anyone successfully done this without > a stencil? Any tips or tricks or words of warning?
I've had pretty good luck with solder paste in a syringe, smear across the pads (and center), then hot-plate. I usually get bridged pins, which I fix with solder braid. I've done CP2102, AT90USB82 and nRF51822, which are 28, 32, and 48 pins, I think. But if time and materials are important, I'd probably look into hiring somebody who does rework all the time. A lot of them are MAGICIANS with solder. One other thing, I design my own board footprints, and I usually extend the traces out a couple mm more than the docs call for. That allows me to get an iron on a trace, heat it up and even add a bit of solder to make a "foot" up against the side of the QFN package. Oh, and a flux pen is your friend. -- Mersenne Law LLP · www.mersenne.com · +1-503-679-1671 - Small Business, Startup and Intellectual Property Law - 9600 S.W. Oak Street · Suite 500 · Tigard, Oregon 97223
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