IN Brief:
- Mouser is now shipping TDK’s AMT45S pulse transformer for EV charging applications.
- The device targets PLC circuits used in CCS and NACS charging control systems.
- A compact 4.7mm × 3.4mm × 3mm footprint supports denser EVSE and onboard charger designs.
Mouser Electronics is now shipping the AMT45S pulse transformer from TDK, a compact component designed for power line communication circuits in electric vehicle charging systems.
The AMT45S targets charging systems using the Combined Charging System in Europe and other international markets, as well as the North American Charging Standard in the US. Both standards use power line communication to allow the vehicle and charger to exchange control data over the charging connection.
Rather than sitting in the main power conversion path, the transformer supports the control electronics around the charging interface. Within the PLC circuit, it provides galvanic isolation against direct current, suppresses noise, and helps preserve signal integrity across the communication channel. That channel forms part of the control chain used to manage charging behaviour between electric vehicle supply equipment and onboard charger electronics.
TDK has built the device using automated winding technology with metal terminals and laser welding. The construction is designed to provide low insertion loss and stable performance across the 2MHz to 30MHz PLC signal band. It also reduces the footprint associated with conventional toroidal transformer approaches, measuring 4.7mm × 3.4mm × 3mm and operating across a temperature range from -40°C to +125°C.
The Mouser product listing identifies AEC-Q200 compliance, an approximate maximum volume of 48mm³, minimum inductance of 15μH, and maximum DC resistance of 1Ω. TDK’s technical data shows the AMT45S reducing volume by around 94% against a conventional market product example, while automated winding is used to improve production efficiency and quality stability.
EV charging design is increasingly defined by the interaction between power conversion, safety, communication, and mechanical packaging. Charging equipment has to manage authentication, billing, charge control, safety supervision, load management, and emerging bidirectional power functions. A stable control link is therefore part of the functional reliability of the overall charging system, even though it operates far below the main power stage.
Power line communication also has to function in a demanding electrical environment. EV chargers combine high currents, switching converters, long conductors, connectors, protection circuits, and embedded control electronics in compact assemblies. Maintaining a clean communication signal while preserving isolation and reducing board area gives small passive and magnetic components a larger role in system performance.
The component-level work around charging control sits alongside higher-voltage development in the wider power electronics chain. Microchip’s 3.3kV SiC modules for medium-voltage power conversion address solid-state transformers, megawatt charging, rail, data centres, and industrial systems. TDK’s AMT45S operates at the other end of the design hierarchy, where isolation and signal behaviour determine whether the control electronics can operate reliably around high-power infrastructure.
The same convergence is visible in data-centre and industrial power systems, where electrical, mechanical, thermal, and communication functions are being designed more tightly together. Molex’s liquid-cooled busbars for AI racks show how power delivery is becoming a dense electromechanical design problem rather than a set of separate components.
For EVSE controllers, charge-port modules, and onboard charger communication boards, a smaller PLC transformer can ease placement and reduce assembly complexity. Qualification, repeatable manufacturing, insertion loss stability, and temperature tolerance are all relevant where charging hardware has to operate in exposed locations and across long service lives.
As charging standards mature and power levels rise, the electronics around the connector will continue to carry more responsibility. Converter ratings and charging speed attract most of the attention, but isolation, noise suppression, stable magnetics, and qualified passives help determine whether high-power charging systems behave predictably outside the lab.