Passives

Sealant excludes need for case on polymer capacitors

8th July 2020
Mick Elliott

Cornell Dubilier Electronics (CDE) Type RA Multilayered Polymer Capacitors for 125°C operationare in stock at New Yorker Electronics.

Type RA capacitors are constructed using stacked metallised polyester protected with an impregnated sealant, which eliminates the need for an external case.

This rugged package style offers the highest energy density technology available for switching power supplies, DC to DC converters and other high ripple current applications. 

These non-inductive multilayer metallised polyester through-hole film capacitors feature a small size, high dV/dt capability, very low ESR at high frequency and a self-healing capability.

They are ideal for use in high frequency switching power supplies, noise suppression, EMI reduction and long-life applications. 

The self-healing capacitors are infused with a microcrystalline polymer sealant and exterior tape wrap that protects the capacitor element from moisture, allowing it meet 85°C / 85% RH requirements for demanding military vehicles and aerospace applications. 

Available in capacitance values ranging from 0.1µF to 10.0µF, voltage ratings of 100, 250, 400 and 500Vdc, Type RA capacitors are terminated with radial leads to cover a broad range of applications in power electronics where high density capacitors are needed for board-level DC filtering.

High frequency response is similar to MLCCs, with better performance and capacitance is unaffected by applied bias voltage.

The capacitor resists damage from pulses and is wave solderable.

Applications are EMI/RFI suppression, ripple current handling capability, pulse generation and any circuit requiring low ESR/ESL, high dV/dt, long life.

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