Film Capacitors - Polyester, Polypropylene and PPS

ADD Components is a professional electronic components distributor supplying film capacitors for power, audio, filtering and snubber applications. We source polyester (PET), polypropylene (PP) and polyphenylene sulfide (PPS) film capacitors in both metallized and foil constructions from leading brands including KEMET, Vishay, WIMA, Panasonic and EPCOS/TDK. From high-volume production requirements to small prototype quantities, we provide competitive wholesale pricing, verified stock and fast global delivery from Hong Kong. Our inventory spans axial, radial and surface-mount packages in a wide range of lead spacings and voltage ratings, so we can match your exact footprint requirements. As an independent distributor, we also source hard-to-find, end-of-life and long lead-time film capacitors to keep your production running without costly redesigns.

Film Capacitor Types and Variants

Polyester Film Capacitors (PET / MKT)

Polyester film capacitors, often designated MKT, offer a good balance of size, cost and performance. They are widely used in coupling, decoupling and general-purpose DC applications where high stability is not critical. Polyester capacitors provide high capacitance density in compact packages, making them a cost-effective choice for consumer and industrial electronics. Typical values range from a few nanofarads to several microfarads across low to mid voltage ratings.

Polypropylene Film Capacitors (PP / MKP)

Polypropylene film capacitors, designated MKP, feature very low dielectric loss, high insulation resistance and excellent stability over temperature and frequency. They are the preferred choice for AC filtering, snubber circuits, power factor correction, motor-run applications and high-end audio where low distortion and long life are essential. In audio circuits, polypropylene capacitors are favored for signal coupling and crossover networks because their very low dielectric absorption preserves signal integrity and minimizes coloration.

Polyphenylene Sulfide Film Capacitors (PPS)

PPS film capacitors combine low loss with excellent high-temperature stability, operating reliably at elevated temperatures where polyester and polypropylene degrade. They are commonly used in high-frequency, timing and automotive applications that demand stable performance in harsh thermal environments, and are increasingly specified in automotive under-hood electronics and high-density surface-mount designs.

Metallized vs. Foil Construction

Metallized film capacitors deposit a thin metal layer directly on the dielectric, providing self-healing properties, compact size and lower cost. Foil (film/foil) capacitors use separate metal foil electrodes for higher current handling, lower ESR and superior pulse capability, making them ideal for high-current snubber and resonant circuits where peak pulse ratings are critical. Metallized construction also allows capacitors to fail open rather than short, an important safety consideration in AC and mains-connected circuits.

Typical Applications

Film capacitors serve a broad range of functions across power and signal circuits. They are widely used in EMI and AC line filtering, DC-link and smoothing circuits, coupling and decoupling stages, snubber networks for power semiconductors, motor-run and power factor correction, and high-end audio signal paths. Their self-healing construction and stable performance make them a reliable choice for applications demanding long service life.

Unlike ceramic capacitors, film capacitors exhibit very stable capacitance with voltage and temperature, which makes them preferable in analog and audio circuits where linearity and low distortion matter. ADD Components maintains strong relationships with authorized and franchised channels, enabling us to supply genuine film capacitors with full traceability and datasheet support on every order.

Key Selection Parameters

• Capacitance value and tolerance

• Rated AC and DC voltage

• Dielectric type (polyester, polypropylene, PPS)

• Construction (metallized or foil)

• Lead spacing and package style

• Temperature rating and stability

• Dissipation factor and insulation resistance

• Self-healing and pulse current capability

Representative Capacitors We Source

Send Us Your Capacitor Requirements

Send us your bill of materials or part numbers and our team will quote competitive wholesale pricing with fast delivery. We supply film capacitors in tape, tray and bulk packaging for production and prototyping.

Info@addcomponents.hk | +852 5334 3091 | WhatsApp: +852 5334 3091

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