We are experiencing problems with soldering of PLCC's.

 

We find that a significant number of these devices are received from the vendor with non-coplanar leads.  The lack of co-planarity causes open solder joints.

 

Investigation has resulted in the knowledge that approximately 5% of the PLCC device we receive are not within the 0.004" co-planarity requirement.  We find some to be out as far as 0.012".  I cannot currently define the point at which the lack of co-planarity becomes an issue. 

 

The supplier is a major manufacturer of these devices.  The parts are on tape and reel.  We have inspected them prior to any processing at our facility, so we know that it is not a question of in-house handling, placement, etc.

 

1) Does anyone else see co-planarity problems with PLCC's?

2) What steps have you successfully taken to correct this problem, and what was the result?

 

3) Are there pieces of equipment I can put inline to screen <*gasp*> out these devices?

 

4) Any assembly or processing tricks you have used successfully to compensate?

 

 

 

Thanks,

 

Lang
x5046