High-Q Porcelain P90 Capacitors, Case Size 1111
Ultra-Stable, Low ESR Porcelain, RF Capacitors for Low-Frequency Power Applications.
Made in North America.
Overview
Johanson's EIA 1111, P90 capacitors are high-power porcelain RF capacitors designed for applications requiring higher capacitance values, increased voltage capability, and ultra-low RF losses. Built with a high-fire P90 dielectric, these capacitors provide exceptional Q, low ESR, and stable performance across extreme operating temperatures.
Key Features:
High-fire porcelain dielectric constructionUltra-low ESR and ESLTypical Q > 10,000Excellent RF power handling performance below 100 MHzStable P90 temperature coefficientNon-magnetic constructionOperating temperatures from -55°C to +200°CControlled SRF and PRF characteristicsRoHS-compliant terminationsAvailable in tape-and-reel packaging for automated assembly
Benefits:
- Handle higher power levels with ultra-low ESR construction.
- Improve RF amplifier efficiency by reducing capacitor losses.
- Support capacitance values up to 20,000 pF in a compact RF package
- Available with voltage ratings up to 1,500 VDC.
- Maintain stable electrical performance from -55°C to +200°C.
- Typical Q values greater than 10,000 help minimize insertion loss.
- Non-magnetic construction makes the series well suited for MRI and sensitive RF systems
Electrical Performance
- Dielectric: Ultra-Low Loss High-Q P90
- Dissipation Factor: 0.1% maximum
- Quality Factor: >1,000 minimum, typically >10,000
- Insulation Resistance:
- 100 GΩ at 25°C
- 10 GΩ at 125°C
- Operating Range: -55°C to +200°C P90
- Temperature Coefficient:+90 ppm/°C ±20 ppm (-55°C to +125°C)+90 ppm/°C ±30 ppm (+125°C to +200°C)
Typical Applications
- RF power amplifiers
- MRI transmit and receive coils
- RF matching networks
- High-current resonant circuits
- Plasma generation equipment
- Semiconductor manufacturing equipmen
- tRF and microwave test systems
- Radar transmitters
- Broadcast and industrial RF equipment
- High-voltage DC blocking application
Why choose an 1111 case size over a smaller capacitor?
The 1111 case size supports higher capacitance values and increased voltage capability while maintaining excellent RF performance. This makes it suitable for applications where smaller case sizes may not provide sufficient power handling or capacitance requirements.
Are 1111 P90 capacitors suitable for high-power RF applications?
Yes. The combination of higher capacitance values, low ESR, high Q, and strong voltage capability makes 1111 P90 capacitors well-suited for high-power RF applications where efficiency, reliability, and power handling are critical.
What design challenges do 1111 P90 capacitors help address?
Johanson's case size 1111, P90 capacitors help engineers:
- Reduce RF losses
- Improve amplifier efficiency
- Minimize thermal buildup
- Increase voltage margin
- Maintain electrical stability
- Improve power handling capability
- Support demanding industrial and medical RF systems
Are 1111 P90 capacitors suitable for MRI and medical RF systems?
Yes. Their low-loss performance, excellent stability, and non-magnetic construction make them suitable for MRI systems and other medical RF applications where performance and reliability are critical.
How do porcelain RF capacitors compare to standard MLCC capacitors?
Porcelain RF capacitors are often selected for demanding RF applications because they provide significantly lower losses, higher Q values, superior thermal stability, and improved performance in RF power circuits compared to general-purpose MLCCs.
How can I evaluate 1111 P90 capacitors for my design?
Request samples
For technical question, contact Johanson Applications Engineers