Technical Library | 2023-03-16 18:51:43.0
Conductive anodic filament (CAF) formation was first reported in 1976.1 This electrochemical failure mode of electronic substrates involves the growth of a copper containing filament subsurface along the epoxy-glass interface, from anode to cathode. Despite the projected lifetime reduction due to CAF, field failures were not identified in the 1980s. Recently, however, field failures of critical equipment have been reported.2 A thorough understanding of the nature of CAF is needed in order to prevent this catastrophic failure from affecting electronic assemblies in the future. Such an understanding requires a comprehensive evaluation of the factors that enhance CAF formation. These factors can be grouped into two types: (1) internal variables and (2) external influences. Internal variables include the composition of the circuit board material, and the conductor metallization and configuration (i.e. via to via, via to surface conductor or surface conductors to surface conductors). External influences can be due to (1) production and (2) storage and use. During production, the flux or hot air solder leveling (HASL) fluid choice, number and severity of temperature cycles, and the method of cleaning may influence CAF resistance. During storage and use, the principal concern is moisture uptake resulting from the ambient humidity. This paper will report on the relationship between these various factors and the formation of CAF. Specifically, we will explore the influences of printed wiring board (PWB) substrate choice as well as the influence of the soldering flux and HASL fluid choices. Due to the ever-increasing circuit density of electronic assemblies, CAF field failures are expected to increase unless careful attention is focused on material and processing choices.
Industry News | 2012-07-31 15:57:01.0
Printable, formable conductive inks that can be applied to a flat plastic substrate and then molded into various shapes offer exciting new opportunities to engineers and designers trying to incorporate internal electronic circuitry into molded automotive and aircraft interior parts, as well as a wide variety of industrial and consumer electronic assemblies...
Career Center | Brooklyn, New York USA | Engineering,Production
Mini-Circuits designs, manufactures and distributes integrated circuits, modules, and sub-systems for high performance radio frequency (RF) and microwave applications. With design, sales and manufacturing locations in over 30 countries, Mini-Ci
Technical Library | 2015-12-23 16:57:27.0
The onset of copper barrel cracks is typically induced by the presence of manufacturing defects. In the absence of discernible manufacturing defects, the causes of copper barrel cracks in printed circuit board (PCB) plated through holes is not well understood. Accordingly, there is a need to determine what affects the onset of barrel cracks and then control those causes to mitigate their initiation.The objective of this research is to conduct a design of experiment (DOE) to determine if there is a relationship between PCB fabrication processes and the prevalence of fine barrel cracks. The test vehicle used will be a 16-layer epoxy-based PCB that has two different sized plated through holes as well as buried vias.
Technical Library | 2016-07-07 15:37:18.0
How susceptible are the metals used in modern electronics manufacturing to corrosion by common beverages? This is a question of interest, especially to manufacturers, retailers and to a certain extent end customers. In this study the dissolution of aluminum, copper, gold, iron, lead, nickel, SAC305 solder, silver, tin and zinc was examined. Individual foils of these materials were fully immersed in one of sixteen chosen beverages and heated for 3 days at 40°C. The resulting solutions were analyzed using ICP-OES. The data were examined in light of the known pH, conductivity and ionic contents of the beverages, determined in previous work. Conclusions about the relative susceptibility to corrosion of the various metals and the corrosive power of the different beverages are made.
Industry News | 2022-11-15 12:33:16.0
SHENMAO America, Inc is pleased to introduce its newest offering: PF735-EP307 Joint Enhanced Solder Paste (JEP). The new low melting point epoxy-based solder material has been developed for extremely fine-pitch or fine pad soldering, especially advanced display assembly.
Industry News | 2012-11-02 19:39:20.0
Engineered Conductive Materials, announces that Rich Wells will present “Conductive Adhesives for Back Contact Solar Modules” during the upcoming MWT Workshop, scheduled to take place November 20-21, 2012 at the Nemo Center in Amsterdam, The Netherlands.
Industry News | 2013-04-25 16:35:51.0
Engineered Material Systems will debut its new DB-1588-2 Low-Cost Conductive Adhesive for back contact applications in crystalline silicon solar modules in booth #W3-688 at the 2013 SNEC 7th International Photovoltaic Power Generation Conference & Exhibition, scheduled to take place May 14-16, 2013 at the Shanghai New International Expo Center in China.
Industry News | 2015-05-18 20:52:11.0
Engineered Materials Systems introduced its new EMS 561-147-2 Low-Cost Snap Cure Conductive Adhesive for stringing or shingling applications in crystalline silicon and thin-film solar modules. EMS 561-147-2 is designed to electrically interconnect solar cells using ribbons or direct cell to cell contact.
Industry News | 2016-11-14 19:45:24.0
Engineered Materials Systems is pleased to introduce its new EMS 561-567 Low-Cost Snap Cure Conductive Adhesive for stringing or shingling applications in crystalline silicon and thin-film solar modules. EMS 561-567 is designed to electrically interconnect solar cells using ribbons or direct cell-to-cell contact.
