PCIM: Polypropylene caps for power

AVX is aiming at power supplies and pulse applications with a series of metallised polypropylene film capacitors.

Called the FM series, they span 0.01-0.47µF and 2kV-250V.

Non-inductively wound and encapsulated in a flame retardant plastic case sealed with self-extinguishing, epoxy, they featuring RoHS-compliant double metallised polyester film electrodes in series construction.

The firm is claiming high reliability at high current stress, high dv/dt capability, high moisture resistance, high capacitance stability, low losses, self-healing properties, and long useful lifetimes. Take a look at the FM Series data sheet to see what it means by this. For example, dV/dt capability varies from 45 to 9,000V/µs.

AVX is advocating these parts as electroitic alternatives: “Unlike aluminium electrolytics, film capacitors do not have a catastrophic failure mode,” it said. “Film capacitors simply experience a parametric loss of capacitance of about 2% from initial value, with no risk of short circuit. The capacitor continues to be functional even after this 2% decrease.”

Operating temperature is -40 to 105°C, and applications are expected in fast rise time pulse circuits, high voltage supplies, power converters, snubbers, and electronic lighting ballasts for compact florescent lamps and LEDs.

There are 17 case sizes (A-S), 14 voltages, three capacitance tolerances (±5, 10, and 20%), and two lead lengths (3.5 and 22mm).

Lead time is approximately eight weeks.

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via Yuichun