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.
Technical Library | 2021-02-11 03:07:39.0
Motorized transportation has changed the way we live. Autonomous vehicles are about to do so once more. This evolution of our transport - from horses and carriages, to cars, to driverless vehicles, - has been driven by both technical innovation and socioeconomic factors. In this report we focus on the technological aspect.
Technical Library | 2021-02-11 03:07:58.0
Motorized transportation has changed the way we live. Autonomous vehicles are about to do so once more. This evolution of our transport - from horses and carriages, to cars, to driverless vehicles, - has been driven by both technical innovation and socioeconomic factors. In this report we focus on the technological aspect.
ScanINSPECT VPI is a fully integrated, stand-alone process control, measurement and inspection and programming workstation for use in process setup and new product introduction in the PCB or Hybrid Microcircuit assembly industries. ScanINSPECT VPI
Used SMT Equipment | AOI / Automated Optical Inspection
This AOI was purchased for $49,995 from Manncorp. The Sherlock AOI is in excellent condition and has under 200 hours of usage. The Sherlock AOI Systems detect a comprehensive range of defects and errors in PCB assembly using the Sherlock PCB ins
Used SMT Equipment | In-Circuit Testers
The Agilent 5071A primary frequency standard delivers unsurpassed accuracy, stability and reliability for the most demanding laboratory and field applications. It is the first caesium (cesium ) standard to specify its stability for averaging times lo
Industry News | 2019-08-21 16:04:15.0
Seika Machinery plans to exhibit in Booth #410 at SMTA International. Seika will showcase the Tsuchiyama n=1 Checker FAI and Kyowa PCAS Software Series for PCB Measurement.
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