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.
Used SMT Equipment | X-Ray Inspection
Glenbrook RTX-113HV X-Ray Inspection System Vintage: June 2001 Tube Hours: Approx 1000 Calibrated through 2014, used approx 3-5 hours since 2014 High Voltage X-Ray for better results 80kV GTI-5000 Image Processor Motorized X-Y Sony Therma
Industry Directory | Distributor
Above Board Electronics - Distributor for your Global Requirements
TYKMA is a manufacturer and distributor that specializes in industrial laser marking and engraving systems for a wide variety of industries around the world.
Tungsten and Molybdenum Boats Typical application Lighting Technology:lamp electrodes for creating the arc in discharge lamps, filament wire for halogen lamps, tubes for annealing filament wires, Evaporation boats for coating cold-light reflect
AIM is a leading global manufacturer of solder assembly materials for the electronics industry. Our product line includes solder paste, liquid flux, bar, wire, preforms, adhesives, cleaners, chemicals, plating anodes and indium and gold alloys. We al
Rugged input devices designed with a precision ground ball, protected by a formed Teflon seal in an anodized aluminum collar, rolling on ground, hardened stainless steel shafts. These industrial trackballs are ideally suited for use in harsh enviro
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Used SMT Equipment | General Purpose Equipment
Package offers preferred: 1.) Protomat S103 Jetstream Dust Extraction System 4 Replacement Bags 3 new Vacuum table backers 1 used tight tolerance vacuum backer with sinter plate Solder Paste Dispensing attachment Upgraded to new Aluminum work
Used SMT Equipment | General Purpose Equipment
Package offers preferred: 1.) Protomat S103 Jetstream Dust Extraction System 4 Replacement Bags 3 new Vacuum table backers 1 used tight tolerance vacuum backer with sinter plate Solder Paste Dispensing attachment Upgraded to new Aluminum work