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12101C474KAT2A Datasheet(PDF) 97 Page - AVX Corporation |
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12101C474KAT2A Datasheet(HTML) 97 Page - AVX Corporation |
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97 / 99 page  96 Surface Mounting Guide MLC Chip Capacitors POST SOLDER HANDLING Once SMP components are soldered to the board, any bending or flexure of the PCB applies stresses to the soldered joints of the components. For leaded devices, the stresses are absorbed by the compliancy of the metal leads and generally don’t result in problems unless the stress is large enough to fracture the soldered connection. Ceramic capacitors are more susceptible to such stress because they don’t have compliant leads and are brittle in nature. The most frequent failure mode is low DC resistance or short circuit. The second failure mode is significant loss of capacitance due to severing of contact between sets of the internal electrodes. Cracks caused by mechanical flexure are very easily identified and generally take one of the following two general forms: Mechanical cracks are often hidden underneath the termination and are difficult to see externally. However, if one end termination falls off during the removal process from PCB, this is one indication that the cause of failure was excessive mechanical stress due to board warping. Type A: Angled crack between bottom of device to top of solder joint. Type B: Fracture from top of device to bottom of device. |
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