25V 220µF Electrolytic Capacitor – Support Documentation
The 25V 220µF electrolytic capacitor is a widely used component in electronic circuits, offering a balance between size and capacitance. It’s commonly employed for filtering, decoupling, and energy storage applications.
Specifications
| Parameter | Value |
|---|---|
| Capacitance | 220µF |
| Rated Voltage | 25V DC |
| Surge Voltage | 32V DC |
| Tolerance | ±20% |
| Operating Temperature Range | -40°C to +105°C |
| Ripple Current | Up to 319mA @ 120Hz |
| ESR (Equivalent Series Resistance) | Varies by manufacturer |
| Leakage Current | ≤0.03CV or 3µA (whichever is greater) after 1 minute |
| Dimensions | Diameter: 8mm, Height: 11.5mm |
| Lead Spacing | 3.5mm |
| Polarity | Polarised |
Pinout and Polarity
Electrolytic capacitors are polarised components, meaning they have a positive and a negative terminal. Correct orientation is crucial during installation.
| Lead | Polarity | Identification |
|---|---|---|
| Longer Lead | Positive (+) | Often marked with a “+” sign on the casing |
| Shorter Lead | Negative (-) | Usually indicated by a stripe or “-” sign on the casing |
Note: Incorrect polarity can lead to capacitor failure or explosion.
Applications
- Power Supply Filtering: Smooths out voltage fluctuations in power supplies.
- Decoupling: Reduces noise by decoupling AC signals from DC power lines.
- Timing Circuits: Works with resistors to set timing intervals.
- Energy Storage: Stores energy for quick release in circuits requiring bursts of power.
Installation Guidelines
- Identify Polarity: Ensure the positive and negative leads are correctly oriented.
- Insert into PCB: Place the leads through the appropriate holes on the printed circuit board.
- Soldering: Solder the leads, ensuring a solid connection without cold joints.
- Trim Excess Leads: After soldering, trim any excess lead length.
Warning: Always discharge capacitors before handling to prevent electric shock.
Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Capacitor not charging | Incorrect polarity or faulty capacitor | Verify polarity and replace if necessary |
| Bulging or leaking capacitor | Overvoltage or aging | Replace with a capacitor of appropriate voltage rating |
| Excessive heat generation | High ripple current or ambient temperature | Ensure operating conditions are within specified limits |
Frequently Asked Questions (FAQs)
- Q: Can I use a capacitor with a higher voltage rating?
- A: Yes, using a capacitor with a higher voltage rating is acceptable, but ensure the physical size fits your application.
- Q: What happens if I reverse the polarity?
- A: Reversing polarity can damage the capacitor, potentially causing it to leak, bulge, or explode.
- Q: How do I store electrolytic capacitors?
- A: Store in a cool, dry place away from direct sunlight and moisture to prolong shelf life.
Maintenance Tips
- Periodically inspect capacitors for signs of bulging, leakage, or discoloration.
- Replace aged capacitors, especially in high-temperature or high-stress environments.
- Ensure capacitors are operated within their specified voltage and temperature ratings.
Note: Always adhere to safety guidelines when working with electronic components to prevent injury or damage.