Polyester Film Capacitor

Polyester Film Capacitors

Polyester film capacitors are a common type of film capacitor that utilizes polyester film as the dielectric material between the conductive plates. They are known for their good stability, reliability, and cost-effectiveness, making them widely used in various electronic applications. 

Key Characteristics:

• Dielectric Material: Polyester film (polyethylene terephthalate or PET)  
• Good Stability: Exhibit excellent stability of capacitance over temperature and time.  
• Self-Healing Properties: Inherently possess self-healing properties, where localized dielectric breakdowns are automatically repaired, extending the capacitor’s lifespan.
• Wide Range of Capacitance Values: Available in a wide range of capacitance values to suit different circuit requirements.  
• Cost-Effective: Generally more affordable compared to some other types of film capacitors.  
• Moderate Voltage Rating: Typically have moderate voltage ratings compared to high-voltage film capacitors.

Common Applications:

• Coupling and Decoupling: Used to isolate DC bias and filter AC signals in amplifier circuits and other electronic systems.
• Timing Circuits: Employed in timing circuits, such as oscillators and timers.  
• Power Supplies: Utilized in power supply circuits for filtering and smoothing. 
• General-Purpose Applications: Suitable for a wide range of general-purpose applications where good stability and reliability are required.