CZ39 Series Automotive Coreless Current Sensor IC – AKM CZ39 Series

The AKM CZ39 Series is a family of coreless automotive current sensor ICs (Currentier) with a 100 ns response time and linear measurement ranges from ±20.9 A to ±154.0 A, designed for use alongside SiC/GaN power devices in on-board chargers, DC/DC converters and eFuse circuits.

CZ39 Series Overview

The series uses a compound Hall element for contactless current sensing and achieves a low primary conductor resistance through its dedicated package, reducing heat generation and easing thermal design under continuous high current loads.

Configuration & Features

• 100 ns response time via compound Hall element
• Typical primary conductor resistance of 0.3 mΩ, rated for up to 40 Arms continuous current at 125 °C ambient temperature
• Supply voltage 5.0 V (4.5 to 5.5 V), ratiometric output with VREF pin
• Isolation voltage 3.0 kVrms, working voltage up to 1100 Vrms (reinforced insulation, pollution degree 1), creepage/clearance distance ≥ 7.2 mm
• Operating temperature range −40 °C to +125 °C, AEC-Q100 qualified
• Certified to IEC/UL62368-1 and UL1577, Pb-free and halogen-free, MSL2a
• Variants CZ3902 to CZ3907 with sensitivities from 100.0 to 13.6 mV/A and linear sensing ranges from ±20.9 A to ±154.0 A, each bipolar

Typical Applications

• On-board chargers (OBC) for electric vehicles
• DC/DC converters in EV powertrains
• Electronic fuses (eFuse) in high-voltage vehicle electrical systems

Related components are available in the Sensor & Converter ICs category and in the E-Mobility & Charging Infrastructure solution area.

Note for Development

The specific variant (CZ3902 to CZ3907) depends on the required measurement range and sensitivity; AKM provides an individual datasheet per variant along with a PCB design kit including Gerber data, footprint and 3D model. The series part status is MP (mass production).

For availability, sample requests and design-in support for the AKM CZ39 Series, contact our team.