Can ESR Be Too Low?

摘要

Tantalum and aluminum polymer capacitors with 7343 EIA footprint can now be manufactured with ESR below 5mfl. Their small footprint, low profile, and low ESR make these capacitors popular for microprocessor decoupling and power supply filtering applications in notebook computers. In response to positive customer demand, manufacturers are aggressively pursuing even lower ESR to satisfy high-performance applications. But customers occasionally complain that some capacitors have ESR that is so low that it causes their circuits to become unstable.