Saturday, February 22, 2014

bityExpress-C PCB inspection

I grabbed a few pictures of the three new bityExpress-C PCBs.  These boards were built with a 4 mil solder mask expansion.  Vias have an 10 mil drill with 5 mil annular rings.  This is more conservative than the 4 mil annular ring vias that I used on bityExpress-B.

The boards look good overall.  Board #3 has the worst solder mask alignment, but it is acceptable.  I'll need to measure it more closely, but based on my initial inspection it looks like I may have to stick with a solder mask expansion of 4 mils.  If I had used a 2 mil expansion this card may have had solder mask on the BGA pads.

The via drills look appropriately sized and well aligned.  On to assembly!


bityExpress-C sn #1 BGA solder mask alignment

bityExpress-C sn #2 BGA solder mask alignment

bityExpress-C sn #3 BGA solder mask alignment

bityExpress-C sn #1 QFN solder mask alignment

bityExpress-C sn #2 QFN solder mask alignment

bityExpress-C sn #3 QFN solder mask alignment

bityExpress-C sn #1 drill/annular ring

bityExpress-C sn #2 drill/annular ring

bityExpress-C sn #3 drill/annular ring

No comments: