SMTA International Conference Proceedings

Pcb Dynamic Coplanarity At Elevated Temperatures

Authors: John Davignon, Ken Chiavone and Jiahui Pan, James Henzi, and David Mendez and Ron Kulterman
Company: Intel Corporation, Akrometrix, Cisco Systems, Inc., and Flextronics International
Date Published: 10/16/2011   Conference: SMTA International

Abstract: With the advent of larger packages and higher densities/pitch the Industry has been concerned with the coplanarity of both the substrate package and the PCB motherboard. The iNEMI PCB Coplanarity WG generated a snapshot in time of the dynamic coplanarity of several PCB designs from four market sectors. This paper address’s the question as to whether room temperature coplanarity measurements can predict the coplanarity at Lead-Free assembly temperatures. This paper investigated the trends in dynamic coplanarity between market sectors, board thickness and global versus local area of concern measurements. It also shares the learning and issues of undertaking dynamic coplanarity measurements of PCB motherboards.

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