New Equipment | Rework & Repair Equipment
Ultimate Performance, BGA Rework Station for small-large PCBs up to 24"/620mm The PDR E6 XL BGA Rework Station is made of only the finest materials and components for optimum precision and rework excellence. PDR's E6 SMD Rework Station is PDR's larg
Industry News | 2009-02-21 17:56:00.0
BANNOCKBURN, Ill. and ARLINGTON, Va., USA, February 19, 2009 � IPC � Meeting the requirements of RoHS (restriction of the use of certain hazardous substances in electrical and electronic equipment) compliance and successfully implementing lead-free electronics assembly processes is an ongoing challenge for the electronic interconnect industry. To help companies work toward their compliance goals, IPC and JEDEC present �Transitioning to Lead Free � Strategies for Implementation,� a three-day conference to be held March 3�5, 2009 in Santa Clara, Calif.
Industry News | 2009-09-17 14:28:17.0
NASHVILLE — September 2009 — Kyzen, a world leading provider of environmentally responsible precision cleaning products for electronics and high-technology manufacturing operations, announces that Mike Bixenman, CTO, along with co-author Mike Konrad, President of Aqueous Technologies, will hold a presentation titled “Cleaning for Reliability Post QFN Rework” at the upcoming SMTA International conference, scheduled to take place October 6-7, 2009 at The Town and Country Resort and Convention Center in San Diego.
Technical Library | 2019-08-07 22:56:45.0
The requirement to reconsider traditional soldering methods is becoming more relevant as the demand for bottom terminated components (QFN/BTC) increases. Thermal pads under said components are designed to enhance the thermal and electrical performance of the component and ultimately allow the component to run more efficiently. Additionally, low voiding is important in decreasing the current path of the circuit to maximize high speed and RF performances. The demand to develop smaller, more reliable, packages has seen voiding requirements decrease below 15 percent and in some instances, below 10 percent.Earlier work has demonstrated the use of micro-fluxed solder preforms as a mechanism to reduce voiding. The current work builds upon these results to focus on developing an engineered approach to void reduction in leadless components (QFN) through increasing understanding of how processing parameters and a use of custom designed micro-fluxed preforms interact. Leveraging the use of a micro-fluxed solder preform in conjunction with low voiding solder paste, stencil design, and application knowhow are critical factors in determining voiding in QFN packages. The study presented seeks to understand the vectors that can contribute to voiding such as PCB pad finish, reflow profile, reflow atmosphere, via configuration, and ultimately solder design.A collaboration between three companies consisting of solder materials supplier, a power semiconductor supplier, and an electronic assembly manufacturer worked together for an in-depth study into the effectiveness of solder preforms at reducing voiding under some of the most prevalent bottom terminated components packages. The effects of factors such as thermal pad size, finish on PCB, preform types, stencil design, reflow profile and atmosphere, have been evaluated using lead-free SAC305 low voiding solder paste and micro-fluxed preforms. Design and manufacturing rules developed from this work will be discussed.
Minimizing Voiding In QFN Packages Using Solder Preforms SMTnet Express July 27, 2012, Subscribers: 25333, Members: Companies: 8933, Users: 33366 Minimizing Voiding In QFN Packages Using Solder Preforms First published in the 2012 IPC APEX EXPO
SMTnet Express, June 11, 2015, Subscribers: 22,861, Members: Companies: 14,392 , Users: 38,338 Solder Paste Stencil Design for Optimal QFN Yield and Reliability B. Gumpert; Lockheed Martin Corporation The use of bottom terminated components (BTC
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/solder-mask-on-0-40-pitch-qfn_topic3127.html
(component MPN is ICM-20948) which has 0.4mm pitch and I'm not sure how to design the solder mask for this footprint. I saw some examples online where for QFNs of 400um pitch it was advised to use solder mask
