ASSEMBLY CHALLENGES OF PACKAGE-ON-PACKAGE (PoP)Author: Richard Boulanger
Company: Universal Instruments Corporation
Date Published: 9/24/2006 Conference: SMTA International
Several articles [1,2,3] describe in detail the requirements as well as examples of this new package. This article will demonstrate how to stack and assemble these modules by using automated placement machines and options used for flip chip assembly. Some modifications are required to accommodate the larger ball size of the bottom CSP as well as the use of solder paste in addition to flux. Stacking requires more accuracy than standard SMT placement Some existing SMT assembly machines can be modified to accurately place stacked CSP’s at high speeds with the appropriate modifications. This approach can be very cost competitive.
We will also review the design of some test vehicles that were built to further examine process and assembly issues. Key words: Package-on-Package, PoP, Fluxing, High-speed assembly.
Members download articles for free:
Not a member yet?
What else do you get when you join SMTA? Read about all of the benefits that go along with membership.
Notice: Sharing of articles is restricted to just your immediate work group. Downloaded papers should not be stored on an external network or shared on the internet.