LEM LA 100-P/SP50 Closed-Loop Hall Effect Current Sensor

LA 100-P/SP50 Product Overview

The LA 100-P/SP50 is a high-precision current sensor based on closed-loop Hall effect technology, from LEM (Switzerland), the global leader in electrical measurement. Featuring closed-loop (compensated) Hall effect principle, it is designed for electronic measurement of DC, AC, and pulsed currents, with galvanic isolation between the primary and secondary circuits.

The sensor operates on a ±12V ~ ±15V bipolar supply, with a rated current of 100A, a measuring range of ±150A (1.5x overload capability). It outputs a 50mA current signal. Featuring PCB through-hole mounting, its compact package allows easy integration into various circuit boards.

With ±0.45% high accuracy, <0.15% linearity, <1µs response time, and 200kHz bandwidth, the LA 100-P/SP50 is a classic choice for AC variable frequency drives, servo drives, UPS systems, switch-mode power supplies, and other industrial applications.

LA 100-P/SP50 Key Technical Specifications

LA 100-P/SP50 Key Advantages

Closed-Loop Hall Technology: Active compensation design eliminates core saturation effects — accuracy ±0.45%, linearity <0.15%

<1µs Fast Response + 200kHz High Bandwidth: Response time <1µs, delay time <500ns, bandwidth up to 200kHz — perfectly matched for high-frequency IGBT/PWM switching applications, providing timely and reliable triggering signals for overcurrent protection

±150A Wide Range + 3x Overload Capability: Measuring range ±150A — withstands instantaneous overload up to 3x rated current — handles motor starting and load transient current surges

Superior Noise Immunity + Low Temperature Drift: Closed-loop architecture provides high external magnetic field rejection — offset current temperature drift only ±0.10mA across full -40℃~+85℃ range — stable operation in complex industrial EMI environments such as VFDs and high-power drives

High Cost-Effectiveness with PCB Mount Design: Standard PCB through-hole package — easy integration — 128g compact design saves space

-40℃ ~ +85℃ Ultra-Wide Temperature Range: Covers applications from cold outdoor to high-temperature industrial environments — meets the needs of most industrial equipment

5-Year Factory Warranty: LEM quality commitment — long-term supply assurance

Why Choose the LA 100-P/SP50?

±0.45% High Accuracy + <0.15% Linearity: Closed-loop compensation ensures accurate measurement across the full range — meets industrial precision control requirements

<1µs Fast Response: Accurately captures IGBT switching transients and current spikes during load changes — provides timely and reliable triggering signals for overcurrent protection

200kHz High Bandwidth: Accurately measures current waveforms up to 200kHz — perfectly matches the output characteristics of modern high-frequency switching power supplies and VFDs

Wide Operating Temperature Range + Low Drift: -40℃ ~ +85℃ wide temperature design with extremely low drift — suitable for outdoor enclosures, industrial field environments, and other harsh temperature scenarios

No Insertion Loss + High Noise Immunity: Closed-loop Hall technology adds no energy loss to the primary circuit — closed-loop architecture provides high external magnetic field rejection

PCB Through-Hole Mount: Easy integration — supports automated production through printed circuit board assembly

LA 100-P/SP50 Target Applications

AC Variable Frequency Drives & Servo Drives: Industrial motor drive current feedback control

DC Motor Static Converters: Motor drive current monitoring

Uninterruptible Power Supplies (UPS): Input/output current monitoring

Switch-Mode Power Supplies (SMPS): High-frequency switching current waveform capture

Battery-Powered Equipment: Charge/discharge current monitoring

Welding Equipment: Pulsed current measurement