LEM-Based Current Sensor

LEM LA 25-NP – High-Precision Hall Effect Current Sensor Evaluation Board

The LEM LA 25-NP is a closed-loop Hall-effect current transducer engineered for instantaneous, high-accuracy current measurement across DC, AC, pulsed, and mixed signal types. Designed with galvanic isolation between primary and secondary circuits, it ensures reliable performance in demanding industrial and power electronics applications without insertion losses. With a nominal primary current of 25 A and a measuring range of ±36 A, the LA 25-NP offers exceptional linearity, low thermal drift, and a rapid 1 µs response time. Its wide frequency bandwidth and strong immunity to external interference make it suitable for dynamic load conditions. The insulated UL 94-V0–rated housing ensures operational safety and durability.

Key Features

• Closed-loop compensated Hall-effect current sensing

• Nominal primary current: 25 A (±36 A range)

• Conversion ratio options: 1:1000 to 5:1000

• Nominal secondary RMS current: 25 mA

• Exceptional accuracy: 0.005

• Response time: 1 µs

• Wide frequency bandwidth with minimal distortion

• UL 94-V0 flame-retardant insulating case

• High overload capability and immunity to interference

Specifications

• Supply Voltage: 14.25 V to 15.75 V (nominal 15 V)

• Operating Temperature: −40 °C to +85 °C

• Current Measuring Range (DC): −36 A to +36 A

Typical Applications

• AC variable-speed drives and servo motor drives

• Static converters for DC motor drives

• Battery-powered systems

• UPS systems

• SMPS and industrial power supplies

• Welding power supply units