In SX Microcontrollers, SX/B Compiler and SX-Key Tool, c-isaac wrote:

I don't want to go the wrong way with this thread but your mention of a flakey 20 MHz crystal struck a chord with me.  I make a product that uses the 20 MHz SMT resonator (Parallax P/N 250-12055) and I have had a large number (approximately 35%) of failures lately with this part recently.  I called tech support and they said it was probably my soldering temperature being too high.  I'm not convinced that this is the problem, but I haven't ruled it out either.  Since it is a RoHs compliant part, it should be able to withstand the higher soldering temperatures.  When I rework the boards with the failed resonators, I use a 600 degree tip for about 1 second on each pad.  So far I haven't had to rework a board twice.

Is this the part you are using on the SX Key?  Have you tested large numbers of these?  Do you test every SX Key that you ship?  

My quantities are fairly small (a couple dozen per month) so I don't have really good data.  The failures started showing up around the time Parallax switched over from the 250-12060 units.

 

Chris I.

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