New Industry Products

Common-Mode Chokes for Automotive Noise Suppression

March 06, 2018 by Paul Shepard

TT Electronics has launched the HA19 common mode choke designed specifically for noise suppression applications found in the growth and expansion of new generation vehicles such as electric vehicles (EVs) and plug-in hybrid vehicles (PHVs). The HA19 series offer high efficiency and excellent current handling in a rugged construction.

It is mechanically robust and features low dc resistance and low temperature rise performance. HA19 is especially well suited for high efficiency electric power steering (EPS) EMI applications where size and AEC-Q200 certification is critical.

Every EPS system requires proper EMI (electromagnetic interference) control with a common mode choke (CMC) and/or a differential mode choke (DMC) serving this function. With the growing shift to EVs and PHEVs, and the accelerated incorporation of electronic components in automobiles, noise suppression has become increasingly important in order to ensure EMI compliance.

TT Electronics' HA19 series common mode chokes are designed with the company's extensive expertise and excellence in noise suppression performance in chokes that the company has supplied for EPS applications over the last 15 years.

The HA19 series is comprised of three parts with standard inductance values, ranging from 11μH to 75μH, and has been demonstrated to be ideal for reducing line-conducted inference in the circuitry. The HA19 series devices offer high reliability and superior current handling from 26.5A to 44A (and even higher over-current withstanding) in a rugged construction.

Their wide -40 to 125°C operating temperature range and AEC-Q200 certification make them suited for high stress automotive environments. The HA19 common mode chokes are lead-free and comply with EU Directive 2011/65/EU (RoHS2) requirements.

The HA19 series embraces TT Electronics' holistic approach to specialized component design to create products that are feature rich, safe, highly efficient and reliable. The result is design and manufacturing solutions for magnetics that have a systematic adherence to the safety standards and quality required by the automotive industry.


  • Operating temperature range -40°C to +125°C
  • Rated current up to 44 amps
  • Ambient temperature, maximum +85°C
  • Temperature rise, maximum 40°C
  • Reduces line conducted interference
  • Low loss ferrite core
  • Proven performance in maintaining transmission signal integrity
  • Excellent performance in rugged environments
  • RoHS compliant
  • AEC-Q200 certified

The HA19 series is a proven solution to eliminate noise emission induced by high radiated frequencies and low conducted frequencies in system circuitry enabling EPS system designers to improve EMI (electromagnetic interference) robustness, ensuring safe vehicle operation.

In line with TT Electronics' purpose to solve its customers' toughest electronics challenges by engineering smart solutions together, the company offers its comprehensive design expertise in customizing the HA19 to meet a customers' individual system requirements.

Applications are expected to include various high frequency noise suppression applications:

  • Transportation
    • Electric Power Steering
    • Electronic Control Units
    • Engine Control
    • Transmission Control
  • Industrial
    • Switch Mode Power Supply
    • DC-DC Converters