LEM CAS6-NP Current Sensor – Compact Solution for Precise Current Measurement

CAS6-NP Product Overview

The LEM CAS6-NP is a multi-range current sensor based on closed-loop fluxgate technology. With a rated current of 6 A RMS and a maximum measurement range up to ±20 A, it is widely used in industrial motor drives, power supplies, and automation control. The sensor is designed for PCB mounting, operates from a single +5 V supply, and provides an output voltage signal. It measures DC, AC, and pulsed currents while providing electrical isolation between the primary and secondary circuits, offering a safe and reliable current monitoring solution for your system.

CAS6NP Key Technical Specifications

CAS6NP Five Key Technical Advantages

1. Closed-loop fluxgate technology – foundation of accuracy and stability

The CAS6-NP uses closed-loop fluxgate sensing technology. Compared to traditional open-loop Hall-effect sensors, it offers lower zero drift, better temperature stability, and higher linearity. Over the entire operating temperature range of -40 ℃ to +85 ℃, the sensor maintains excellent measurement consistency, making it particularly suitable for industrial environments where ambient temperature varies widely, ensuring long-term stable operation.

2. Very low offset temperature coefficient – stable output in all weather

The offset of the sensor changes very little with temperature – a significant advantage in alternating high-low temperature environments. Whether in a freezing workshop in the north or a hot factory floor in the south, the CAS6-NP maintains stable measurement accuracy without frequent recalibration, reducing system maintenance costs.

3. Excellent dv/dt immunity – reliable measurement in high-speed switching circuits

In highspeed power conversion applications such as inverters and switched-mode power supplies, there are many voltage change rate (dv/dt) spikes that can interfere with surrounding circuits. The CAS6-NP offers outstanding dv/dt immunity, maintaining signal integrity in noisy environments and avoiding measurement errors or false triggering – an ideal choice for high-performance power electronic systems.

4. Compact design, PCB through-hole mounting – saves board space

The CAS6-NP is housed in a compact modular package designed for PCB through-hole mounting. Its pinout is compatible with the LTS series, making it easy to upgrade existing designs. The case material meets UL 94-V0 flammability rating, ensuring safety in demanding electrical environments.

5. Wide bandwidth and fast response – capture transient current details

The sensor provides a wide frequency response from DC to 300 kHz with a response time of less than 0.3 µs, accurately capturing transient details in high-frequency currents. From the inrush current at motor start-up to fine details in PWM waveforms, the CAS6-NP responds quickly and delivers accurate output, providing real-time and reliable current feedback for closed-loop control systems.

CAS6-NP Rich Application Scenarios

With its outstanding performance, the CAS6-NP is widely used in the following fields:

Industrial motor drives

AC variable-frequency drives

Servo motor drive systems

Static converters for DC motor drives

Power management and battery-powered equipment

Current monitoring in battery-powered applications

Uninterruptible power supplies (UPS)

Current feedback control in switched-mode power supplies (SMPS)

Welding and special power supplies

Current monitoring in welding equipment power supplies

Realtime current control in industrial special power supplies

Renewable energy and energy-saving applications

Current detection in solar inverters

Current monitoring in electric vehicle charging equipment

Current optimisation control in high-energy-consumption equipment

Automotive electronics

Power management in cars, buses and trucks

Current monitoring in on-board motor drive systems

Why Choose the CAS6-NP?