EMI Filters for Automotive Industry Applications


Automotives ranging from two wheelers, auto rickshaws, cars and heavy vehicles consist of several electro-mechanical components and sub-assemblies. Active electronic components in automotives range from ABS and ECU automotive powertrains/safety equipment, car audio, car navigation system, and other automotive infotainment devices. Those components and assemblies may emit RF noise or be exposed to external sources of energy - resulting in unanticipated changes in system operation.


In the automotive industry, this noise is classified into two categories – Broadband (due to electrical arcing) and Narrowband (due to active electronics). Vehicle Original Equipment Manufacturers (OEM) address these EMC considerations in the component and system design phase to build immunity characteristics.

System and component testing can be conducted by simulating "external" sources to ensure immunity characteristics. Most component testing methods are based upon CISPR, ISO standards.

EMIS offers

Single Phase EMI Filters

High attenuation, compact size. Available also with shock proof terminals.

  • Power line filters
  • Surge Suppressors
  • Filters for dV / dt voltage spikes

3 Phase filters

General purpose, cost effective filters. High performance with shock proof terminals.

  • Conventional type
  • Book shelf design
  • Foot Print Design
  • Bus bar type
  • Panel mount

Harmonic Filters

Passive and active filters for ignition and power systems

AC Line Reactors

Helps to reduce harmonic distortion and increase automotive component lifetime, limit the flow of electrical current in transient, short circuit currents, attenuate line spikes and surge currents.

  • Single phase and three phase Line Reactors with 2-5% impedance for various power quality applications
  • Consisting of steel core electrical grade laminations and copper wound coils.
  • Designed corresponding to EN 61558-2-20, EN 60076-6, UL61800-5-1 specifications.

Other solutions

for EMI noise suppression in automotives include

  • Shielding for circuits and sub-assemblies
  • Output Ferrite Chokes for on-board communication units
  • Comprehensive Grounding and coupling solutions
See our full range of EMI/EMC products
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