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AIM Solder is pleased to announce their participation at the SMTA Wisconsin Expo & Tech Forum, scheduled to take place May 8, 2018 at the Milwaukee Airport Crowne Plaza in Milwaukee, Wisconsin. AIM will highlight their revolutionary REL61 and REL22 lead-free solder alloys, along with their full line of solder assembly materials.
AIM’s new alloys provide the PCB assembly industry with unique solutions to address the limitations of current industry offerings. REL22 is an award-winning, high reliability alloy with durability characteristics that double the reliability of SAC305 in harsh environments. REL61 is a low silver solder alloy that solves the process challenges associated with many other low/no silver solder alloys. With a 10°C lower melting temperature and superior wetting performance, REL61 can lower process temperatures, prevent PCB damage, and reduce costs and waste. AIM’s REL alloys are available in paste, wire and bar formats and are engineered for reliability, usability, and cost effectiveness.
Along with their REL products, AIM will showcase its full line of advanced solder materials, including its solder pastes, liquid fluxes, tin/lead and lead-free alloys. To discover all of AIM’s products and services, visit the company at the SMTA Wisconsin Expo & Tech Forum for more information and to speak with one of AIM’s knowledgeable staff members.
Reza Ghaffarian, Jet Propulsion Laboratory, California Institute of Technology
Electroless nickel/electroless palladium/immersion gold (ENEPIG) surface finish for PCBs has now become a key surface finish that is used for both tin-lead and lead-free solder assemblies. This article presents the reliability of LGA component packages with 1156 pads assembled with tin-lead solder onto PCBs with an ENEPIG finish and then subjected to thermal cycling and then isothermal aging.
Duane Benson, Screaming Circuits
There are two primary types of causes of board warping: process related at the fab or assembly shop, and layout related issues. If it's warped before assembly, it's between fab and layout. If it's flat before assembly and warped after, it's most likely between layout and assembly. That said, sometimes a fab problem won't show up until a pass through the reflow oven at your assembly partner.
Glen Thomas, Ph.D., and Bill Cardoso, Ph.D., Creative Electron Inc.
As aerospace companies consider the shift to lead-free solder alloys and glues, concerns have been raised about whether their current X-ray inspection and quality-control procedures will still be valid. With lead solder, joints are easily interpreted by the operator or the system imaging software because lead provides excellent image contrasts due to relatively high X-ray absorption compared to that of PCB and component materials. Will this hold true as they shift to lead-free solder compounds?