As new energy vehicles become more intelligent, more integrated, and more power-dense, electromagnetic interference (EMI) is emerging as one of the biggest challenges to system stability.

From powertrain control units and safety systems to ADAS, in-vehicle infotainment, and high-speed communication networks, modern vehicles rely on increasingly complex electronic architectures. In this environment, even small amounts of unwanted electromagnetic noise can affect signal integrity, power stability, and overall system reliability.

That is why EMI filtering is no longer just a supporting function. It is a critical part of vehicle electronics design.

At the center of this protection is the automotive common mode choke. As a core EMI suppression component, its performance directly influences how well a vehicle can resist noise and maintain stable operation under real-world automotive conditions.

With years of experience in magnetic component development, Microgate Technology offers a full range of automotive common mode chokes and customized EMI filtering solutions designed for the demanding needs of new energy vehicles.

Why Common Mode Chokes Matter in New Energy Vehicles

A common mode choke, also known as a common mode filter inductor, is designed to suppress common mode noise without interfering with normal signal or power transmission.

Its operating principle is based on two windings with the same number of turns placed on the same magnetic core. Under normal operating conditions, differential currents generate opposing magnetic fields that cancel each other out, allowing the desired signal to pass through with minimal impact. When common mode noise appears, the magnetic fields reinforce one another, creating high impedance that blocks the unwanted interference.

This makes common mode chokes essential in automotive EMI design, especially in vehicles where both signal lines and power lines are exposed to increasingly complex electromagnetic environments.

In new energy vehicles, common mode chokes are widely used in two major application areas:

Signal line filtering
They are used in high-speed communication interfaces such as USB, HDMI, LVDS, CAN/CAN FD, and automotive Ethernet to reduce radiation noise and crosstalk, helping maintain stable and reliable data transmission.

Power line filtering
They are also applied in the power supply lines of ECUs for powertrain and safety systems, as well as in modules such as ADAS and IVI, where they help prevent common mode noise from spreading through the power network and interfering with sensitive electronics.

Some of Microgate's automotive common mode choke series include:

Built for Demanding Automotive Applications

Automotive-grade design for harsh operating environments

Vehicle electronics operate in environments where heat, vibration, current stress, and long-term reliability all matter. Microgate automotive common mode chokes are developed with these realities in mind, delivering stable electrical performance under demanding automotive conditions.

Wide product coverage for flexible design selection

Microgate's automotive common mode choke portfolio includes series such as AMGRC2012U/M, AMGRC3216H/M, AMGRC3225B/4532B, AMGRC3225/4532E, and AMGRC3225F. Package sizes cover 3225, 5050/6050, 7060, 9070, 1211, and 1513, while current capability extends from approximately 1A to 10A.

This broad range allows engineers to select the right solution based on current level, available PCB space, and target frequency range. Whether the requirement is compact filtering for signal lines in smart cockpit systems or higher-current suppression for power applications in drivetrain electronics, Microgate provides matching options.

Proven reliability under automotive-grade testing

Reliability is one of the most important requirements in automotive electronics, and Microgate addresses this with products developed and manufactured according to AEC-Q200 standards.

Its automotive common mode chokes have passed a series of strict reliability tests, including high-temperature storage, temperature cycling, damp heat, mechanical shock, vibration, ESD, and solvent resistance. Across a wide operating temperature range of -40°C to 155°C, inductance variation remains within 10%, while the products maintain structural integrity and stable performance.

They are also designed to withstand 100G / 6ms mechanical shock and 10–2000Hz vibration, supporting long-term operation in the challenging mechanical environment of new energy vehicles.

High EMI Suppression Without Compromising System Performance

In automotive electronics, effective filtering is not just about blocking noise. It is also about preserving signal quality and power integrity.

Microgate automotive common mode chokes use highly symmetrical dual-winding or multi-winding structures, ensuring strong consistency in winding turns and conductor length. Combined with high-performance core materials such as nanocrystalline and ferrite, the result is high common mode impedance in the target frequency range and low differential mode impedance during normal operation.

This balance is especially important for high-speed automotive communication standards such as CAN FD and automotive Ethernet, where EMI suppression must be achieved without introducing signal reflection, attenuation, or transmission instability.

Compact SMD Design for Space-Constrained Vehicle Electronics

As vehicle electronics continue to move toward higher integration and denser PCB layouts, component size and mounting efficiency are becoming more important than ever.

Microgate automotive common mode chokes adopt a surface-mount design, helping customers save board space and support automated assembly. Their compact structure makes them well suited for modern vehicle platforms where layout flexibility is limited and integration density continues to increase.

At the same time, the products are optimized for low DC resistance (DCR), which helps reduce power loss and temperature rise. Even in higher-current applications, they maintain stable performance and strong resistance to magnetic saturation.

More Than Products: A Complete EMI Solution Capability

End-to-end manufacturing and quality control

Microgate has built an automotive-grade production and quality control system covering the full manufacturing flow, including winding and soldering, assembly and baking, appearance inspection, electrical testing, and packaging. Key processes are automated and intelligently managed to support consistency, reliability, and scalable production.

Custom EMI solution support

In addition to its standard product portfolio, Microgate also works with new energy vehicle OEMs and Tier 1 suppliers on customized EMI filtering solutions. Based on specific platform requirements, the company can support optimization in structural design, electrical performance, and system-level filtering strategies.

Ready for future automotive power architectures

As SiC and GaN devices continue to drive faster switching speeds and higher-frequency noise, automotive EMI challenges are becoming more complex. Microgate is actively developing new magnetic core materials and advanced winding structures to improve common mode impedance and anti-saturation performance in higher-frequency applications, including frequencies above 3 MHz.

At the same time, the company is exploring more integrated filter designs that combine common mode chokes with other EMI suppression components, helping reduce component size while improving system integration for next-generation vehicle electronics.

Powering the Future of Cleaner, Smarter Mobility

From consumer electronics to automotive electronics, Microgate Technology has remained focused on one thing: delivering high-performance magnetic solutions through continuous innovation.

For new energy vehicles facing ever more demanding EMI requirements, Microgate automotive common mode chokes provide the combination that matters most: automotive-grade reliability, broad application coverage, and customization capability.

As vehicle electronics continue to advance, Microgate will keep pushing forward with more efficient, more reliable, and more application-ready solutions to help customers build the next generation of cleaner, smarter, and more stable mobility systems.