EMI noise is a common issue in AC-powered electronic devices. Whether you're designing a switching power supply, a motor driver, or a smart plug, electromagnetic interference can cause instability, reduce performance, or even lead to failure in sensitive circuits.
So, how can engineers effectively suppress EMI in AC circuits without compromising on space or safety?
Use a Certified X1 Film Capacitor – Like jb’s JFT Series
X1 capacitors are safety-certified components designed for EMI suppression between the AC line and neutral. They are tested to withstand impulse voltages up to 4kV, making them ideal for industrial and commercial applications where reliability matters.
The jb JFT series is a compact, high-performance solution designed to meet these exact needs. Built with metallized polypropylene film, the JFT capacitor offers self-healing properties, low dissipation factor, and compliance with IEC 60384-14 (Class X1).
Key Benefits of Using the JFT X1 Capacitor
✔ Compact size — starting at just 13 × 11 × 5 mm, ideal for space-constrained designs
✔ Rated for 300VAC and 440VAC
✔ Capacitance range from 0.0022μF to 4.7μF
✔ Operating temperature from -55°C to +105°C
✔ Insulation resistance ≥ 15,000 MΩ (for C ≤ 0.33μF)
✔ Self-healing construction for long-term reliability
Where to Use It?
The JFT series is commonly used in:
- AC EMI input filters
- Switched-mode power supplies (SMPS)
- LED drivers and ballasts
- HVAC controllers
- Industrial automation equipment
- Chargers, adapters, and smart home devices
Why Not Just Use a Ceramic Capacitor?
While ceramic capacitors are compact, they usually lack safety certification and cannot withstand high surge voltages. The JFT X1 capacitor, in contrast, offers:
| Feature | JFT X1 Capacitor | Ceramic Capacitor |
|---|---|---|
| EMI Suppression | Excellent | Moderate |
| Surge Handling | Up to 4kV | Limited |
| Safety Certification | Yes (Class X1) | No |
| Fail-Safe Design | Self-healing | Risk of short circuit |
| Long-Term Reliability | High | Medium |
Learn More
Want to see this capacitor in action? Check out our video demonstration above or download the official datasheet below:
Final Thoughts
If you're looking for a space-saving, safety-certified solution to suppress EMI in your AC applications, the jb JFT X1 film capacitor is an excellent choice. Its proven performance and compact size make it ideal for both new designs and replacements in existing systems.
Contact Us
Email: info@jbcapacitors.com
Website: www.jbcapacitors.com
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