Detailed Introduction to the Core Characteristics and Applications of Metallized Thin Film Capacitors

Structure and Principle

1. Basic Structure

-Dielectric: Plastic films such as polyester (PET), polypropylene (PP), or polyphenylene sulfide (PPS) are usually used.

-Metal electrode: A very thin metal layer (such as aluminum or zinc) is formed on the surface of a thin film through vacuum evaporation technology, with a thickness of only nanometers.

-*Winding process *: Wrap the metallized film into a cylindrical or flat shape, solder leads at both ends, and package it.

2.  Self Healing Characteristics

-When local breakdown occurs, the metal layer around the breakdown point will instantly evaporate, forming an insulating zone, restoring capacitive function, and significantly extending the service life.

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Core Advantages

1. *Small size and light weight

-Metalized electrodes are thinner than traditional metal foils and can reduce volume by 30% -50% under the same capacity.

2. Excellent high-frequency performance**

-Polypropylene (PP) film has low dielectric loss and is suitable for high-frequency circuits such as switching power supplies and RF applications.

3. High voltage resistance and reliability

-The rated voltage range is wide (from tens of volts to thousands of volts), and the ability to withstand pulse currents is strong.

4. *Long lifespan and stability

-The self-healing characteristic reduces the failure rate, and the temperature characteristics are stable (such as the consistent performance of PP film capacitors within -40 ℃~+105 ℃).