RA Series Multilayer Film Capacitors

By Cornell Dubilier Electronics (CDE) 262

RA Series Multilayer Film Capacitors

Cornell Dubilier’s RA series 125°C radial multilayer film capacitors offer high capacitance per unit volume, efficient use of PCB space, lower self-inductance compared to conventional wound film capacitors, and high self-resonant frequency (exceeding 10 MHz) allows higher frequency operation. The RA series have welded radial-leads in a slim rectangular package made with durable non-inductive construction. Their sizes vary based on values/ratings, ranging from 8.9 mm x 3.9 mm x 7.1 mm to 16.5 mm x 6.6 mm x 11.7 mm. The RA series is designed to maintain performance over a long life. They outperform MLCC devices and are ideal for high-rel, no-fail applications.

Features
  • Small size/shape allows dense circuitry design
  • Rugged, self-encased construction
  • High-reliability design:
    • Assembled with a high laminating pressure to prevent air gaps between polyester film layers
    • Self-healing with no-short failure mode
    • Impregnated with a microcrystalline polymer sealant under vacuum for resistance to moisture
  • Very low ESR/ESL and high dv/dt
  • Meets MIL Std 202 Method 204D for vibration
  • Voltage rating: 100 VDC, 250 VDC, 400 VDC, and 500 VDC
  • RoHS compliant and wave-solderable
  • Capacitance range 0.1 µF to 10 µF
  • Operating temperature: -55°C to +125°C
  • Moisture resistance: +85°C/85% RH/21 days
  • Dissipation factor: ≤1.0% @ 25°C, 1 kHz
  • Self-inductance is only 2 nh to 6 nh (typical)
  • High-frequency response is similar to MLCCs with better performance
    • Capacitance is unaffected by applied bias voltage
    • Resists damage from pulses
    • No piezoelectric effect
    • No cracking
    • Greater lifespan
Applications
  • In-circuit applications include:
    • EMI/RFI suppression
    • Board-level power conversion
    • Pulse generation
    • Any circuit requiring low ESR/ESL, high dv/dt
  • Input/output filtering in 48 V telecom bus power applications (on-board or DC/DC modules)
  • High-reliability, no-fail applications
  • Automotive fuel pump circuitry
  • Brushless DC motor driver circuits
  • Pulse generation in solid-state ignition circuitry for small engines
  • Provides ultra-reliable filtering and smoothing for applications in:
    • UPS systems
    • High-frequency switching power supplies
    • Inverters and micro-inverters
    • DC output power conditioning

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