Transcription of Multi-Layer Ceramic Capacitors: Why and How They Fail
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Multi-Layer Ceramic Capacitors: Why and How They Fail Property of Passive Plus, Inc. 1 PPI MLCC materials and processes Lifetime limitations of materials Manufacturing shortcomings and defects When Bad Things Happen to Good Customers: Mishandling and design inadequacies reliability models and testing PPI 2 Property of Passive Plus, Inc. Multi-Layer Ceramic Capacitor (MLCC) PPI 3 Property of Passive Plus, Inc. MLCC Mounted on Microstrip PPI 4 Fig. 2. Vertically mounted multilayer chip capacitor on microstrip (top view "through" dielectric cover layer)microstrip substratetracecapacitorSection R-RRRterminationFeatures: (1) A Ceramic brick with interleaved metallic electrodes (2) Soldered across a gap in microstrip center conductor (shown) or extending from center conductor to ground plane (not shown) (2) Shown oriented with electrodes vertical to substrate Property of Passive Plus, Inc.
Basic Reliability Concepts and Definitions PPI Property of Passive Plus, Inc 30 Probability of failure occurring before a certain time = = Unreliability function ≡ Q(t) Reliability function = R(t) Failure (“hazard”) rate function = instantaneous failure frequency based on accumulated age
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