Electronics Forum | Thu Sep 12 11:26:11 EDT 2002 | scottefiske
CK, If joints have been validated prior to ICT (under BGA Scope), more often than not repeatable joint fractures are due to undo stress being placed on the component during ICT test. Verify ICT probes and fixture. If after proving out fixture/pin com
Electronics Forum | Sat Jul 05 14:07:33 EDT 2008 | shellydhami
Main diffrences in failure modes for mechanically and thermally induced BGA solder joint fracture
Industry News | 2016-10-09 20:43:23.0
The SMTA Capital Chapter is pleased to announce its final meeting of 2016 will be on November 10th, from 5:00 pm to 7:00 pm at Zentech, 6980 Tudsbury Road, Baltimore, Maryland 21244. The focus of this chapter meeting will be “AXI and MXI; How They Complement Each Other” presented by John Travis, Nordson Dage.
Industry News | 2008-03-05 22:38:31.0
OSAKA, JAPAN � March 5, 2008 � Nihon Superior Co. Ltd., a supplier of advanced lead-free soldering materials to the global electronics industry, announces that it is contributing a paper, titled �High Impact Strength Tin-Copper Based Lead-free Solder Bump Alloys� authored by Tetsuro Nishimura, Shoichi Suenaga and Keith Sweatman, to the Technical Conference that is part of the TMS 2008 Annual Meeting and Exposition scheduled to take place March 9-13, 2008, in New Orleans, Louisiana.
Technical Library | 2020-11-09 16:59:53.0
A customer contacted ACI Technologies regarding a high failure rate of their assemblies. They provided assemblies to be X-rayed and inspected for the purpose of identifying any process related issues such as (but not limited to) solder and assembly workmanship and evidence of damage due to moisture related problems during reflow (a.k.a. "popcorning"). Moisture damage usually appears as physical damage to the component. The first indication of moisture damage would be externally observable changes to the package in the form of bulging or fractures to the outer surface of the component, an example of which is shown in Figure 1. Internally observable indicators of moisture damage typically include fractures to the die inside the package and lifted or fractured wire bonds. These conditions would be apparent during transmissive X-ray inspection. Another symptom of moisture related damage would be inconsistent solder joint sizes that result from package deformation during the liquidus phase of the reflow process. None of these indicators of moisture related damage were present on the customer samples.
Technical Library | 2020-05-08 18:22:31.0
A customer contacted the Helpline to perform analysis on a lead-free assembly which exhibited intermittent functionality. The lead-free assembly exhibiting intermittent functionality when pressure was applied to the ball grid array (BGA) packages. Industrial adaptation of a Restriction of Hazardous Substances (RoHS) compliant solder standard has created a new host of failure modes observed in lead-free assemblies. Pad cratering occurs when fractures propagate along the epoxy resin layer on the underside of the BGA connecting pads. While originating from process, design, and end use conditions, it is the combination of a rigid lead-free solder with inflexible printed circuit board (PCB) laminates that has advanced the prevalence of this condition. Pad cratering is simply the result of mechanical stress exceeding material limitations.
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2018/07/pan_APEX06.pdf
), “Transitioning to Lead-free Assemblies,” Printed Circuit Design and Manufracture, March 2005, pp. 17-23. Newman, K., “BGA Brittle Fracture Alternative Solder Joint Integrity Test Methods,” Proceedings of IEEE/ECTC the 55th Electronic Components and Technology
