New Industry Products

KEMET Unveils a Line of X2 EMI Suppression Film Capacitors 

October 14, 2020 by Gary Elinoff

The R52 series is optimally designed for the challenging environments typical of automotive, energy, and industrial Applications.

Kemet’s R52 series of compact polypropylene film X2 EMI suppression capacitors were designed specifically to control EMI in AC line filtering applications. The Metallized Polypropylene Film EMI Suppression Capacitors are made for use in harsh conditions. They are aimed at uses that require X2 safety classifications, specifically for uses in which a failed capacitor could result in exposing people to electric shock.

Film capacitors such as members of the R2 series possess a self-healing capability, making them a prime choice for safety applications across power lines. Well-suited for applications that require keeping potentially disruptive or damaging line transients and EMI out of susceptible equipment, they are an answer to the need for smaller, higher-capacitance solutions for suppressing EMI in demanding environments. 


The R52 series of X2 EMI Suppression Capacitors. Image courtesy of Kemet
The R52 series of X2 EMI Suppression Capacitors. Image courtesy of Kemet


Members of the R52 series are available with capacitances of up to 22µF, and they feature 85/85 THB Class IIB classification. Yet their overall volume is 60% smaller than the other X2 class capacitors on the market today.


For the Non-Specialist

What are X2 Capacitors?

X Class capacitors are capacitors that are connected line to line across the electrical power mains and, in the event of failure of the capacitor, a short circuit can happen, but there is no potential for electrical shock. Specifically, X2 capacitors are designed for situations where the peak service voltage is less than or equal to 2500 volts.


What is the 85/85 THB Class IIB classification? 

This standard is largely a measurement of how well an EMI capacitor stands up to humidity. To pass, a device must stand up to 85% humidity at 85℃ at its rated voltage for 500 hours. It is part of IEC 60384-14 


Important Specifications

The units are available over a capacitance range of 0.15 to 22 µF

All units are rated at 310 VAC at 50/60 Hz


Optimal for Many Applications 

Through meeting the tough AEC-Q200 automotive standard, the R52 series are suited for use in the many DC/DC converters that are central parts of EVs and hybrid vehicles. 

Additionally, their small size makes them suitable for use cases involving high energy density. 

Moreover, the exceptionally high reliability of the R52 series makes them excellent choices for deployment within the smart grid and the IoT, where electronic devices are often installed in remote and inaccessible locations.


Applications include

  • The severe ambient conditions typical of automotive applications

  • Applications calling for connection in series with the power mains
  • Capacitive power supplies
  • Energy meters
  • Industrial applications involving challenging environmental conditions. 


Regulatory and Environmental Approvals Include

The especially complex web of regulatory and environmental specifications that apply to the R52 series are spelled out in great detail in Kemet’s comprehensive data sheet. Below is a basic guide.

  • ENEC
  • UL
  • cUL
  • CQC
  • RoHS compliant 
  • THB Grade IIB: 85°C, 85% RH, 500 hours at URAC acc. to IEC 60384-14
  • AEC-Q200
  • Climatic category (IEC 60068-1): 40/110/56 


Physical Characteristics

Operating temperature range of −40°C to +110°C

Sizes ranges from 18 x 5 x 11 (L x W x H in millimeters) for the 0.10µF unit up to 41.5 x 30.9 x 45 for the 22.0 µF.