Common mode Chokes Tackle EPS Noise Suppression


TT Electronics has launched new common mode chokes for use in noise suppression applications found with the expansion of new generation vehicles such as electric vehicles (EVs) and plug-in hybrid vehicles (PHVs).

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.

According to its maker, the HA19 series eliminate noise emission induced by high radiated frequencies and low conducted frequencies in system circuitry, enabling EPS system designers to improve EMI robustness, ensuring safe vehicle operation.


The components comprise three parts with standard inductance values, ranging from 11 µH to 75 µH, which the company says are ideal to reduce line-conducted inference in the circuitry.

The devices offer high reliability and superior current handling from 26.5 A to 44 A (and even higher over-current withstanding) in a rugged construction.

They are suited for high-stress automotive environments due to a wide -40 to 125 °C operating temperature range and AEC-Q200 certification.

The HA19 common mode chokes are lead-free and comply with EU Directive 2011/65/EU (RoHS2) requirements.

The chokes are also suited for ECU and transmission control applications.

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