Let's take a look at stacked-film capacitors

What is a film capacitor? A film capacitor is a type of capacitor that uses metal foil as electrodes and incorporates plastic films—such as polyester, polypropylene, polystyrene, or polycarbonate—as the dielectric material.

Thanks to advantages such as non-polarity, high voltage resistance, excellent temperature stability, high insulation resistance, and superior frequency characteristics, these capacitors are widely used in sectors including telecommunications, home appliances, and medical equipment, holding a significant place in the electronics market. However, while many people are familiar with film capacitors, they may not realize that these components come in two distinct types: wound-style and stacked-style.

Wound-type and stacked-type film capacitors are distinguished by their internal structural differences.

Stacked-type film capacitors are constructed by layering multiple sheets of polymer film and metal foil. This structure resembles a stack of pages in a book, with each layer playing a vital role. The manufacturing process is relatively complex, requiring precise control over the thickness, uniformity, and flatness of each film and foil layer.

Additionally, insulating material must be inserted between the layers to prevent internal short circuits. The assembled capacitor cores are then encased in a metal housing, and the terminals are secured via welding or crimping.

Stacked-layer film capacitors offer the following advantages:

1. Higher capacitance density

Thanks to their multi-layer structure, stacked-layer film capacitors achieve higher capacitance density, allowing for significant capacitance within a compact volume.

This makes them highly promising for use in miniaturized and lightweight electronic devices.

2. Superior high-frequency characteristics

Secondly, stacked-layer film capacitors excel in high-frequency performance. Due to their structural design and the insulating materials between layers, they exhibit relatively low ESL (Equivalent Series Inductance) and ESR (Equivalent Series Resistance), making them suitable for applications such as filtering, coupling, and energy storage in high-frequency circuits.

3. Excellent voltage and current handling capabilities

Furthermore, stacked-layer film capacitors demonstrate robust voltage and current handling capabilities, maintaining stable performance even in demanding operating environments.

Stacked-type film capacitors offer the aforementioned advantages and are widely used in fields such as electronic equipment, industrial control, and new energy.

Whether dealing with stacked-type or wound-type film capacitors, ensuring high quality is essential; only high-quality film capacitors can guarantee the stable operation of electronic equipment.