Industry News | 2020-11-06 17:27:12.0
The Assembly Division of MacDermid Alpha Electronics Solutions will be presenting the paper, "Power Package Attach by Silver Sintering – Process, Performance & Reliability" at the PCIM Asia Conference 2020 which will take place from November 16-18 in Shanghai, China.
Albedo Telecom AT.NStorm.rack NetStorm 19' Rack Platform equipped with a Net.Storm in a PCI-e card GUI in a PC Remotely Controlled Size, USB, Ethernet, Serial and other ports depending on the model Carrier features such as doubl
Used SMT Equipment | In-Circuit Testers
Fluke 8846A Precision Multimeter 6.5 DIGIT PRECISION MULTIMETER Precision and versatility to handle your most demanding measurements on the bench or in a system. High performance and feature rich, yet remarkably easy-to-use. Digital Multime
The FINEPLACER® lambda is a flexible sub-micron bonder used for precise placement, die attach and advanced packaging. The system offers outstanding flexibility with a modular design and can be easily reconfigured for different applications. The syst
Technical Library | 2015-11-19 18:15:07.0
The move to lead free (Pb-free) electronics by the commercial industry has resulted in an increasing number of ball grid array components (BGAs) which are only available with Pb-free solder balls. The reliability of these devices is not well established when assembled using a standard tin-lead (SnPb) solder paste and reflow profile, known as a backward compatible process. Previous studies in processing mixed alloy solder joints have demonstrated the importance of using a reflow temperature high enough to achieve complete mixing of the SnPb solder paste with the Pb-free solder ball. Research has indicated that complete mixing can occur below the melting point of the Pb-free alloy and is dependent on a number of factors including solder ball composition, solder ball to solder paste ratio, and peak reflow times and temperatures. Increasing the lead content in the system enables full mixing of the solder joint with a reduced peak reflow temperature, however, previous research is conflicting regarding the effect that lead percentage has on solder joint reliability in this mixed alloy solder joint.
Technical Library | 2011-10-20 22:03:30.0
Results of FEM modelling of thermal stress analysis in printed circuit boards are given in the article. It is shown that thermal stress alone is not solely caused by differences in coefficients of thermal expansion of individual layers. The emergence of thermal stress is subject to both the layered structure of the wall and given boundary conditions, as well as the existence of a temperature gradient in the direction normal to the surface of the wall. A practical application focuses on the issue of recycling of PCB with the effort to achieve separation of layers due to thermal stress. Role modelling of thermal stress in this area lies in predicting the possibility of separation, depending on the type of thermal stress and material parameters.
Technical Library | 2023-02-13 18:56:42.0
This paper describes the results of an intensive whisker formation study on Pb-free assemblies with different levels of cleanliness. Thirteen types of as-received surface-mount and pin-through-hole components were cleaned and intentionally contaminated with solutions containing chloride, sulfate, bromide, and nitrate. Then the parts were assembled on double-sided boards that were also cleaned or intentionally contaminated with three fluxes having different halide contents. The assemblies were subjected to high-temperature/high-humidity testing (85_C/85% RH). Periodic examination found that contamination triggered whisker formation on both exposed tin and solder fillets. Whisker occurrence and parameters depending on the type and level of contamination are discussed. Cross-sections were used to assess the metallurgical aspects of whisker formation and the microstructural changes occurring during corrosion.
Industry News | 2019-12-16 22:47:11.0
The difference between gas phase reflow welding and hot air reflow welding is that gas phase reflow welding USES vapor phase liquid to heat the key.
Product show: SMT6000A is dedicated to research and develop electronic products, it is a small desktop type machine which suits for small and medium-sized enterprise assembly line is developed by our company. This machine has superior function 1.sma
Product show: SMT6000A is dedicated to research and develop electronic products, it is a small desktop type machine which suits for small and medium-sized enterprise assembly line is developed by our company. This machine has superior function 1.sma
