Asahi Kasei Microdevices has introduced the CZ3K series of current sensors for electric vehicle systems, designed for use in high-power onboard chargers, DC/DC converters, and electronic fuse applications. The sensors support current measurement up to ±300A while maintaining very low conductor resistance, helping improve efficiency and reduce system size.
The new series is engineered to support compact and more powerful bidirectional EV power systems by lowering heat generation during continuous operation. AKM noted that the CZ3K sensors build on the fast response performance and noise resistance of its existing CZ39 series already used in automotive applications.
With expanded current sensing capability and reduced resistance, the CZ3K series is aimed at next-generation EV architectures using silicon carbide (SiC) and gallium nitride (GaN) semiconductors. These technologies enable higher switching frequencies and more compact power electronics designs. AKM added that the sensors can also help reduce PCB footprint and overall system dimensions.
The devices deliver a 100 ns response time for accurate current detection and rapid protection against overcurrent and short-circuit events. Their broad measurement range also makes them suitable for automotive eFuse systems, improving safety and reliability through configurable protection settings.
Target applications for the CZ3K series include EV onboard chargers, automotive DC/DC converters, and electronic fuse protection systems.
AKM plans to showcase the CZ3K series at PCIM Europe 2026, taking place in Nuremberg from June 9 to 11, 2026.
