Axial Film Capacitors

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Wound with axial film capacitors, lead axial leads, wrapped in heat tape, both ends of the liquid epoxy potting, circular or cylindrical shape is flat, low noise.

Simple structure and ease of usage make this product very user-friendly.
Specifications: 630V voltage, 0.022uF capacity, 5.7mm (0.22 in) diameter, and 15.3mm (0.6 in) body length are the specifications for the capacitor.
High performance polyester film capacitor with steady properties.
Ideal for electronic experts and hobbyists, this is a good pick.
Application: Fit for vintage radios and tube amplifiers.

Features of axial film capacitors

Film capacitors are a type of capacitor that has a cylindrical shape and leads that extend from each end of the cylinder. Some of the key features of film capacitors include:

1. Capacitance: Axial film capacitors are available in a wide range of capacitances, typically from a few picofarads to several microfarads.
2. Tolerance: The tolerance of film capacitors is usually between ±5% and ±10%, which means that the actual capacitance may vary slightly from the stated value.
3. Voltage rating: Axial film capacitors are rated for a maximum voltage that they can safely handle, typically ranging from a few hundred volts to several thousand volts.
4. Dielectric material: Film capacitors use a thin film of a dielectric material, such as polyester, polypropylene, or polycarbonate, to store electric charge.
5. Operating temperature range: Axial film capacitors are designed to operate within a certain temperature range, typically from -40°C to +85°C.
6. Frequency range: Film capacitors are suitable for use in applications that require a relatively low frequency range, typically up to several hundred kilohertz.
7. Size: Axial film capacitors are available in a variety of sizes, ranging from small, surface-mount devices to larger, through-hole components.
8. Low leakage current: Film capacitors have a low leakage current, which means that they can maintain their charge for a longer period of time without losing energy.
9. Self-healing properties: If an axial film capacitor is subjected to a voltage that exceeds its rating, it may fail temporarily. However, due to its self-healing properties, the capacitor can recover and continue to function normally once the voltage is removed.

Overall, axial film capacitors are reliable and cost-effective components that are commonly used in a wide range of electronic applications, including power supplies, filters, and timing circuits.

Polyster film—The axial capacitor is constructed of premium polyester film, which is sturdy, long-lasting, difficult to damage, and has a long useful life.
The axial film capacitors lightweight has a light design and straightforward construction. The numbers are legible, making them simple and comfortable for you to use.
The film capacitors are excellent choices for vintage radios and tube amplifiers. It’s a common addition to mechanical and electrical equipment.
Best choice For electronic experts or hobbyists, this capacitor is a great option. You must not miss it if you genuinely enjoy operating hands-on or building your own electrical devices.

Specifications of axial film capacitors:

Dielectric: Polyester film

Electrodes: Vacuum-evaporated metal

Coating: Out-wrapped with Mylar tape and ends sealed with epoxy resin

Leads: Axial leads of tinned wire

Reference standard: IEC 384-2 grade 1; SJ/T 10873-1996

Climatic catalog: 40/85/21 (From 85 up to 105°C with derating voltage 1.25%/°C)

Capacitance tolerance: M=±20%, K=±10%, J=±5%

Dissipation factor (tangent of loss): C≤1.0uF DF ≤0.8%

C>1.0uF DF ≤1%  (at 20°C, 1kHz)

Voltage-proof: 1.6*UR Unit: VDC (5s at 20°C)

Insulation resistance:

C≤0.33uF IR: ≥15,000MΩ

C>0.33uF IR*C: ≥3,000S (1 minute at 20°C and RH≤65%)

Endurance:

1,000 hours with 150% of rated voltage at 85°C

After the test: ∆C/C ≤8%, ∆DF≤0.30%(C>1 uF);

∆DF≤0.50%(C≤1 uF);

IR ≥0.5% of the specified value (20°C, 1kHz)

Dedicated metallized film capacitor manufacturer, established in 2007. We have established an industry zone which area is nearly more than 10000 square meters and annual production of about 1 billion film capacitors production and supply capacity. We have passed the “ROHS” test of ISO9001 quality management system certification. Our main products include the metallized polyester film capacitor (CL21), metallized polypropylene film capacitor (CBB21), box-type metallized polypropylene film capacitor (CBB21B), box-type subminiature metallized polyester film capacitor (CL23B), axial metallized polyester film capacitor (CL20), axial metallized polypropylene film capacitor (CBB20) and RC components, miniaturization of safety and other series products. Above product series, we can do the 5mm pitch products, which is advantage products in China.

Axial film capacitors are a type of passive electronic component widely used in various circuits due to their efficient energy storage, stability, and versatility. Their distinctive design and characteristics make them valuable components in a wide range of applications. This article delves into the construction, advantages, and applications of film capacitors.

Construction of Film Capacitors:

Axial film capacitors are constructed by winding thin plastic film coated with a metal electrode into a cylindrical shape. The winding process ensures that the electrode layers are evenly spaced and separated by the dielectric film. The capacitor’s value is determined by factors like the dielectric constant of the film, its thickness, and the surface area of the electrode. The leads, attached at opposite ends of the cylinder, are often axially oriented, giving these capacitors their name.

Advantages of Axial Film Capacitors:

• High Capacitance and Voltage Ratings: Film capacitors offer a wide range of capacitance values and voltage ratings, making them suitable for both low-power and high-power applications.

• Stability and Reliability: These capacitors exhibit stable performance over a wide range of temperatures and frequencies, making them reliable components in various circuit designs.

• Low Dissipation Factor: Axial film capacitors have low losses, which means they efficiently store and discharge energy without significant energy loss as heat.

• Compact Design: The cylindrical shape and compact size of film capacitors allow for easy integration into circuit boards, even in tight spaces.

• Long Lifespan: Properly manufactured film capacitors can have a long operational life, contributing to the longevity of electronic systems.

Applications of Axial Film Capacitors:

• Power Supply Filtering: Film capacitors are commonly used in power supply circuits to filter out noise and voltage fluctuations, ensuring a stable DC voltage output.

• Coupling and Decoupling: They are employed in coupling and decoupling applications, allowing AC signals to pass while blocking DC components or noise.

• Timing and Oscillation Circuits: In timing and oscillation circuits, axial film capacitors play a role in determining the frequency and stability of oscillations.

• Signal Processing: These capacitors are used in signal processing circuits, including audio filters, tone control circuits, and equalizers.

• Pulse Power Systems: Film capacitors are valuable in pulse power systems where rapid energy discharge is required, as seen in pulsed lasers, radar systems, and electromagnetic pulse generators.

Considerations for Axial Film Capacitors:

• Voltage and Current Ratings: Choose film capacitors with appropriate voltage and current ratings to avoid overloading and potential failures.

• Temperature and Environment: Consider the operating temperature range and environmental conditions of your application to ensure the capacitor’s performance remains stable.

• Dielectric Material: Different dielectric materials have varying temperature stability and dielectric constants. Select the appropriate type for your application’s requirements.

• Lead Orientation: Be mindful of the axial lead orientation when soldering and mounting the capacitors onto circuit boards.

Maintenance Guidelines for Film Capacitors

Axial film capacitors are crucial components in electronic circuits, contributing to various applications due to their reliability and stable performance. While they generally require minimal maintenance, following proper guidelines can help ensure their longevity and consistent functionality. Here’s a maintenance guide for film capacitors:

Storage:

• Store film capacitors in a clean, dry environment, away from moisture, dust, and extreme temperatures.
• Ensure they are stored in an organized manner to prevent physical damage to the leads or terminals.

Handling:

• Handle axial film capacitors with care to prevent bending or stressing their leads.
• Avoid bending the leads at sharp angles, as this can weaken the connections and lead to failures.

Cleaning:

• If cleaning is necessary, use a soft, lint-free cloth or a gentle air spray to remove dust or debris.
• Avoid using abrasive materials or solvents that could damage the capacitor’s casing or leads.

Voltage and Current Ratings:

• Always operate axial film capacitors within their specified voltage and current ratings to prevent overheating or breakdown.
• Ensure that the capacitor’s voltage rating is higher than the maximum voltage it will encounter in your circuit.

Temperature Considerations:

• Be aware of the temperature range in which the circuit operates and select capacitors with appropriate temperature stability.
• Extreme temperatures can affect the performance and lifespan of axial film capacitors.

Dielectric Material:

• Understand the dielectric material used in the capacitor and its temperature characteristics to ensure it’s suitable for your application.

Circuit Design:

• Properly design and implement the circuit to avoid voltage spikes or excessive current that could damage the capacitor.

Soldering:

• When soldering or desoldering axial film capacitors, use appropriate soldering techniques to prevent excessive heat that might damage the capacitor.
• Avoid overheating the leads, as it can affect their integrity.

Insulation and Encapsulation:

• Ensure that the encapsulation or insulation of the capacitor remains intact. Any damage to the casing could expose the internal components to environmental factors.

Aging and Replacement:

• Over time, capacitors can experience aging or degradation. Periodically inspect your circuit for signs of reduced performance, such as increased leakage or reduced capacitance.
• If you notice significant changes in performance, consider replacing the capacitor with a new one that matches the original specifications.

Electrostatic Discharge (ESD):

• Use anti-static precautions when handling axial film capacitors, especially in sensitive electronic environments, to prevent damage from electrostatic discharge.

Conclusion:

Axial film capacitors stand as reliable and versatile components in modern electronics, offering a combination of stable performance, efficiency, and compact design. Their use in power supply filtering, signal processing, and timing circuits underscores their importance in diverse applications. As technology advances, film capacitors continue to play a pivotal role in enabling efficient energy storage, signal manipulation, and circuit stability. By selecting the right axial film capacitors for specific applications and adhering to best practices in design and installation, engineers can ensure the optimal performance and longevity of their electronic systems.