Soldered most of an AFE4400 to ground…

[ AFE4400 ] [ SFH-7050 ] [ Design files on GitHub ]

So I finally took up the courage to paint solder balls onto our freshly cut PCB, but I think I placed too much solder on the thermal pad, and bam, about 5 pins are now shorted to ground. By shorted, I mean that they have about an ohm to 1k ohms to ground. That because our vias didn’t plate so the thermal pad itself isn’t really grounded. Not sure if we’ll still be able to use it to dissipate heat.

I can easily use jumper wires to wire the chip’s ground plane out (one tiny trace at pin 40 will get all the load), or we can try cutting again. I am just tempted to give this one a shot, because getting another board would take time and money.

img003

Front

img004

Back

By the way, the SFH-7050 is the coolest LED package I have come across (one notch above the reverse wingulls!) There are three tiny tiny emitters inside (I wish I had a camera to click the microscopic view…some day when my phone is fixed!)

 

 

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