Electronics Forum | Fri Apr 09 08:58:28 EDT 1999 | Justin Medernach
| I'm not sure about limits but perhaps underfilling the BGA might easy your mind. Treat the BGA as something similar to a flip chip and dispense underfill around the part. The rigidity gained by the cured underfill may be enough to alleviate some
Electronics Forum | Bob |
Wed Apr 07 19:40:07 EDT 1999
Industry News | 2012-05-07 14:16:13.0
SMTA China held its annual awards presentation in conjunction with the SMTA China Annual Breakfast Reception and Recognition Ceremony, which took place on April 26, 2012 at the Shanghai Expo Intercontinental Hotel during NEPCON China in Shanghai.
Industry News | 2012-05-23 14:18:26.0
Joint Industry Guideline Provides Best Practices for Measuring the Strain on Boards and Components During Manufacturing
Technical Library | 2024-08-29 18:30:46.0
The mechanical experience of consumption (i.e., feel, softness, and texture) of many foods is intrinsic to their enjoyable consumption, one example being the habit of twisting a sandwich cookie to reveal the cream. Scientifically, sandwich cookies present a paradigmatic model of parallel plate rheometry in which a fluid sample, the cream, is held between two parallel plates, the wafers. When the wafers are counterrotated, the cream deforms, flows, and ultimately fractures, leading to separation of the cookie into two pieces. We introduce Oreology (/Oriːˈɒl@dʒi/), from the Nabisco Oreo for "cookie" and the Greek rheo logia for "flow study," as the study of the flow and fracture of sandwich cookies. Using a laboratory rheometer, we measure failure mechanics of the eponymous Oreo's "creme" and probe the influence of rotation rate, amount of creme, and flavor on the stress–strain curve and postmortem creme distribution. The results typically show adhesive failure, in which nearly all (95%) creme remains on one wafer after failure, and we ascribe this to the production process, as we confirm that the creme-heavy side is uniformly oriented within most of the boxes of Oreos. However, cookies in boxes stored under potentially adverse conditions (higher temperature and humidity) show cohesive failure resulting in the creme dividing between wafer halves after failure. Failure mechanics further classify the creme texture as "mushy." Finally, we introduce and validate the design of an open-source, three-dimensionally printed Oreometer powered by rubber bands and coins for encouraging higher precision home studies to contribute new discoveries to this incipient field of study
Technical Library | 2013-08-29 19:52:43.0
Au over Ni on Cu is a widely used printed circuit board (PCB) surface finish, under bump metallization (UBM), and component lead metallization. It is generally accepted that less than 3 wt.% Au in Sn-Pb solder joints inhibits formation of detrimental intermetallic compounds (IMC). However, the critical limit for Au content in Pb-free solder joints is not well established. Three surface-mount package platforms, one with a matte Sn surface finish and the others with Ni/Au finish, were soldered to Ni/Au-finished PCB using Sn-3.0Ag 0.5Cu (SAC305) solder, in a realistic manufacturing setting. The assembled boards were divided into three groups: one without any thermal treatment, one subjected to isothermal aging at 125°C for 30 days, and the third group aged at 125°C for 56 days...
The industrial chain of laser processing has formed a complete ecological chain of laser processing from enterprises producing core lasers upstream to enterprises producing various kinds of laser processing equipment and then to enterprises providing
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Spartronics is more than just a company. We have great facilities, a dedicated and talented team, tremendous capacity and capabilities, and longstanding customers who need us. Now, it’s all about driving forward with a winning strategy that bui
SMTnet Express, July 8, 2021, Subscribers: 26,934, Companies: 11,398, Users: 26,743 Effects Of Surface Finish On High Frequency Signal Loss Using Various Substrate Materials The amount of information transferred on wireless networks
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2018/07/supplier-partnership-benefits.pdf
. Initially, the profiling software helps oven users save a significant amount of time in the process development stage, by optimizing reflow profiles quickly
Imagineering, Inc. | https://www.pcbnet.com/blog/the-cost-of-pcb-fabrication-pricing-factors/
. Some of the most common materials used to make PCBs include: Solder Polymer inks Fiberglass Gold Silver Copper Each material plays a different role
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