CZ3K Coreless Current Sensor Series for EV – AKM CZ3K series

The CZ3K series from AKM (Asahi Kasei Microdevices) is a coreless current sensor series for electric vehicle applications with a current measurement range of up to ±300A.

CZ3K Series Overview

Asahi Kasei Microdevices (AKM) has developed the CZ3K series current sensors for electric vehicle (EV) applications. The CZ3K series contributes to the downsizing of increasingly high-power bidirectional on-board chargers (OBCs) and DC/DC converters by offering a wide current measurement range of up to ±300A and a low primary conductor resistance of 0.27 mΩ.

Configuration & Features

• Current measurement range of up to ±300A
• Typical primary conductor resistance of 0.27 mΩ
• 100 ns response time combined with high accuracy
• Inherits the fast response and noise immunity of the established CZ39 series
• Suited for use with next-generation SiC and GaN power devices, enabling higher switching frequencies
• Lower resistance allows for further reduction in PCB size, contributing to overall system miniaturization

Typical Applications

With a fast response time of 100 ns and high accuracy, the CZ3K series is well suited for fast protection against overcurrent and short-circuit conditions, and its wide current measurement range makes it suitable for electronic fuses (eFuses) with flexibly configurable cutoff timing and current thresholds. Typical target systems are bidirectional on-board chargers and DC/DC converters within E-Mobility & Charging Infrastructure. The series has also been adopted as a key enabling component of Microchip Technology Inc.'s Machine Learning (ML) / AI-based Arc Fault Detection (AFD) reference design featuring a dsPIC33A Digital Signal Controller.

Note for Procurement

AKM has started mass production of the CZ3K series current sensors, which the manufacturer states are highly compatible with single-stage topologies. Detailed datasheets for individual variants are not yet publicly available; technical documentation and samples can be requested through Atlantik Elektronik as a design-in partner. For availability, samples and project pricing, contact our sales team.