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High-Q Porcelain P90 Capacitors, Case Size 3838

Ultra-Stable, Low ESR Porcelain, RF Capacitors for Low-Frequency Power Applications.

Made in North America.

Overview


Johanson's EIA 3838, P90 capacitors are engineered for high-power and high-voltage RF applications where low losses, thermal stability, and reliable performance are essential. Built with a high-fire porcelain dielectric, these capacitors deliver exceptionally high Q, ultra-low ESR, and superior power handling, making them ideal for demanding RF, industrial, medical, and semiconductor systems.

The 3838 package extends voltage capability up to 7,200 VDC while maintaining the low-loss performance required for RF amplifiers, matching networks, MRI equipment, plasma generators, and industrial RF power systems.

Key Features:

  • High-fire P90 porcelain dielectric construction.
  • Ultra-low ESR and low-loss performance.
  • Typical Q values exceeding 10,000.
  • Excellent RF power handling performance below 100 MHz
  • Stable capacitance over temperature.
  • Non-magnetic construction.
  • Operating temperature range from -55°C to +200°C
  • Controlled resonant characteristics for predictable RF performance
  • RoHS-compliant surface mount termination system

Benefits:

Need Higher Voltage Margin?

RF power systems can be limited by components that lack sufficient voltage capability. P90 capacitors support voltage ratings up to 7,200 VDC, providing the headroom needed for demanding operating conditions and long-term reliability.

Struggling with RF Efficiency and Excess Heat?

High ESR components can increase power loss and heat generation, reducing overall system efficiency. P90 capacitors feature ultra-low ESR and high-Q performance to help minimize RF losses and improve power handling.

Designing for High-Power RF Applications?

Applications such as RF generators, MRI systems, plasma equipment, and industrial RF power systems require components that can withstand high voltage and RF current levels. P90 capacitors combine high capacitance values, high voltage capability, and low-loss performance to support these demanding designs.

Concerned About Performance in Extreme Temperatures?

Temperature variations can affect circuit stability and reliability. P90 dielectric technology supports operation from -55°C to +200°C, helping maintain consistent electrical performance in harsh environments.

Electrical Performance:

  • Dielectric: Ultra-Low Loss High-Q P90 Porcelain
  • Capacitance Values: Up to 20,000 pF
  • Maximum Voltage Rating: Up to 7,200 VDC
  • 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 Temperature Range: -55°C to +200°C

Mechanical Specifications:

3838 Package Size (Metric 9696)

  • Length: 0.380" (+0.015/-0.010) [9.65 mm (+0.38/-0.25)]
  • Width: 0.380" ±0.010 [9.65 mm ±0.25]
  • Maximum Thickness: 0.150" [3.81 mm]
  • End Band: 0.024" to 0.059" [0.61 mm to 1.50 mm]

Typical Applications:

  • MRI RF coils and medical imaging equipment
  • High-power RF amplifiers
  • RF matching and tuning networks.
  • Radar and defense electronics
  • Plasma generation and semiconductor manufacturing equipment
  • RF and microwave test systems
  • Industrial RF generators and heating equipment
  • High-voltage DC blocking and bypass circuits