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Alternatives to HASL: Users Guide for Surface Finishes

Technical Library | 1999-08-09 11:11:55.0

A great deal of controversy continues to surround the use of Hot Air Solder Leveling (HASL) in the production of printed circuit boards (PCBs). The financial burden, technological limitations and environmental issues surrounding the HASL process continue to grow. This requires an in-depth review by the printed circuit board manufacturing plant, as well as the assembly operation and instrument designers ( OEMs), to determine what alternative surface finishes are appropriate.

Viasystems Group, Inc.

Optimizing Flip Chip Substrate Layout for Assembly

Technical Library | 2007-11-29 17:20:31.0

Programs have been developed to predict the expected yield of flip chip assemblies, based on substrate design and the statistics of actual manufactured boards, as well as placement machine accuracy, variations in bump sizes, and possible substrate warpage. These predictions and the trends they reveal can be used to direct changes in design so that defect levels will fall below the acceptable limits. Shapes of joints are calculated analytically, or when this is not possible, numerically by means of a public domain program called Surface Evolver. The method is illustrated with an example involving the substrate for a flip chip BGA.

Universal Instruments Corporation

Drop Impact Reliability of Edge-bonded Lead-free Chipscale Packages

Technical Library | 2010-03-30 21:51:23.0

This paper presents the drop test reliability results for edge-bonded 0.5mm pitch lead-free chip scale packages (CSPs) on a standard JEDEC drop reliability test board.

Flex (Flextronics International)

An Engineer's Guide to Testing and Evaluating The Performance of Desiccant Bags for the Protection of Critical Moisture Sensitive Devices

Technical Library | 2020-08-16 14:50:25.0

Not all desiccant bags are created or perform equally. Performance measures include: a) How long does desiccant last? b) How much are can be desiccated in a given area? c) How much moisture is retained, and or released back into the atmosphere? This article walks engineers through various test they can perform to determine efficacy. Additionally, the article highlight between adsorption vs adsorption.

Steel Camel

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