White paper: parameters important for surface-mount applications of MLCs
‘Parameters important for surface-mount applications of multi-layer ceramic capacitors’
With increasing use of multi-layer ceramic capacitors (MLCs) in surface-mount technology (SMT), the understanding of the mechanical properties and thermal stress resistance parameters of MLCs is essential for zero-defect soldering and sub-ppm failure rates. This paper from AVX reviews various aspects of SMT, including zero-defect design, placement considerations, soldering techniques, thermal stress resistance parameters and post-solder handling.
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The leakage current of a solid tantalum capacitor is the sum of several independent factors. From measurements of leakage over a range of test conditions, some degree of separation of these components of the current can be achieved and so the relative importance of factors leading to high leakage can be assessed. There is a background level present directly related to dielectric absorption and it contributes to the loss factor of the capacitor. It is not a true leakage. On top of this ...
Solder pad geometry for surface mounting chip capacitors has been examined visually for three types of defects. Visual defects observed as a function of solder pad geometry were opens, misalignment of chips (rotation) and drawbridges. Geometry of the solder pads was seen to play an important role in the visual defects observed. Of particular importance were the overlap of the pad and the capacitor, the width of solder pads and the extension of the solder pad outside the capacitor (in ...
Reliable, high-yield SMT assemblies are easily realised if time is taken in the beginning to ensure yields and reliability. You cannot slap components down on a PC board with solder and hope for manufacturability; the PC board must be designed to be manufacturable.
Solid tantalum capacitors have been known for their reliability, robustness and stable parameters. The technology, therefore, is highly suitable for further research and development targeting enhancing operating temperatures of up to 200ºC. This white paper from AVX describes a novel 200ºC capacitor concept and technical development and processes of enhancing the operating temperature of solid tantalum capacitor technology. Stability of the main capacitor parameters at high ambient ...
Ceramic resonators provide an attractive alternative to quartz crystals for oscillation frequency stabilisation in many applications. Their low cost, mechanical ruggedness and small size often outweigh the reduced precision to which frequencies can be controlled, when compared with quartz devices. Ceramic resonators are now available in surface-mountable packages suitable for automated production processes.