TDK Intros 500 V and 1000 V EMC Filter Series for EV Inverters

TDK has introduced the CarXield B84252 series of EMC filters, which have been designed for use in 500 V and 1000 V electric vehicle inverter systems. The filters are intended to suppress high-frequency noise between inverters and batteries, supporting electromagnetic compatibility and emissions requirements.

Electric vehicle powertrains require careful electromagnetic interference (EMI) management to meet emissions regulations and maintain system stability. The CarXield series offers EMC filters pre-qualified for 500 V and 1000 V DC inverter systems. These standardized modules integrate directly into EV powertrains, helping manufacturers meet EMC requirements.

TDK’s compact EMI filters for 500 V / 1000 V EV inverters handling up to 400 A. Image used courtesy of TDK

High Current Capability in a Compact Footprint

CarXield modules support rated currents up to 400 A with transient peak handling up to 1000 A for 10 seconds, making them suitable for medium- and high-power inverter applications. The modules maintain low insertion loss due to their typical DC resistance of just 0.1 mΩ, which helps preserve powertrain efficiency.

Compact CarXield modules can fit within standard EV inverter housings, while still supporting high current. Image used courtesy of TDK

With a mechanical envelope of 140 x 59 x 50 mm, the filter size is compact enough to fit within most EV inverter housing constraints. This current capacity, thermal tolerance, and size balance allow for more straightforward mechanical integration, especially in tightly packed engine bays or skateboard-style chassis platforms.

Nanocrystalline Cores and Passive Discharge Protection

Each CarXield unit is built using nanocrystalline magnetic cores, which provide high permeability and low core losses at the switching frequencies typical of modern SiC- and IGBT-based inverters. This material choice enhances both conducted and radiated noise suppression. The filters incorporate X2 and Y2 safety-rated capacitors for differential and common-mode noise reduction, which includes an integrated passive discharge circuit to safely bleed off stored charge after system shutdown, and eliminates the need for separate discharge hardware and improves safety during maintenance or fault conditions.

System Integration and Thermal Flexibility

CarXield filters are available with or without integrated copper busbars, allowing system designers to match existing power layouts or thermal management constraints. Units can be ordered with optional passivated finishes to resist corrosion in high-humidity or salt spray environments, such as marine-adjacent or winter road operation.

CarXield EMC filter shown with (right) and without (left) integrated copper busbars for adaptable power and thermal layout configurations. Image used courtesy of TDK

The design’s modularity makes it possible to adapt the filters to a range of spatial constraints or packaging envelopes without significant electrical re-validation. This approach streamlines integration for both production platforms and prototype vehicles.

Standardization for Regulatory Compliance and Shorter Design Cycles

By offering validated, off-the-shelf solutions certified to AEC-Q200 and tested against MBN LV 124 profiles, TDK enables vehicle manufacturers to reduce the time and cost associated with EMC compliance. Standardizing around the CarXield filter platform can help simplify component validation during EMI compliance testing. For example, for mid-sized EV manufacturers, that can mean less back-and-forth with suppliers and a more straightforward qualification process. Instead of engineering a custom filter for every new model, teams can reuse the same pre-qualified design across multiple vehicle platforms. This accelerates time-to-market and simplifies inventory, documentation, and test planning across projects.

The CarXield B84252 series is a compact EMC filter designed for 500 V and 1000 V EV inverter systems. It uses nanocrystalline core materials to support high current handling in a small form factor. The modules have been tested to automotive reliability standards and are intended to simplify EMI mitigation without requiring custom development. For many EV platforms, this can help reduce integration time while maintaining compliance.