The LA 25-P is a high-precision closed-loop Hall effect current sensor manufactured by LEM, 

designed for accurate measurement of AC, DC, 

or pulsed currents with excellent isolation between primary and secondary circuits. 

Key functional characteristics include:

• Measurement Principle: 

• Utilizes closed-loop Hall effect technology for bidirectional current sensing 

• with galvanic isolation between primary and secondary circuits (isolation voltage: 2.5 kV) 

• Current Range: Measures currents from 0 to ±70A (with limitations at different temperatures) 

• Accuracy: Offers ±0.91% accuracy at 25°C with excellent linearity (±0.15%) 

• Frequency Response: Operates from DC to 200kHz, suitable for various dynamic current measurements 

• Electrical Characteristics:

  • Supply voltage: 12V to 15V (±5%) 

  • Power consumption: 10mA maximum 

  • Output: Ratiometric current output 

• Physical Characteristics:

  • Through-hole mounting with single pass-through module design 

  • Operating temperature range: -25°C to +85°C 

  • Compliant with RoHS standards 

Technical Specifications

Primary Applications

The LA 25-P current sensor is widely used in various industrial

and power electronic applications requiring accurate current measurement with isolation:

1. Power Electronics Systems

   • Switch Mode Power Supplies (SMPS) 

   • Uninterruptible Power Supplies (UPS) 

   • Welding equipment power supplies 

   • Battery charging systems 

2. Industrial Automation

   • Motor drives and servo controls 

   • Pump and fan control/monitoring 

   • Industrial robotics 

   • Crane and elevator systems 

3. Energy Systems

   • Solar inverters 

   • Wind power generation systems 

   • Energy conversion equipment 

4. Transportation

   • Electric vehicle systems 

   • Railway traction systems 

   • Forklift electrical systems 

5. Other Applications

   • Medical equipment power supplies 

   • Telecommunications equipment 

   • Household appliances (e.g., induction cooktops) 

Alternative/Similar Models

LEM offers several alternative current sensors with similar functionality or different current ranges:

1. Direct Alternatives in LA Series

   • LA 25-NP: Multi-range version (selectable 5, 6, 8, 12 & 25A RMS) with ±4V or ±5V output 

   • LAH 25-NP: Similar to LA 25-NP with different packaging 

2. Lower Current Options

   • LA 20-P: 20A measurement range 

   • LT 108-S7: For very low current measurements 

3. Higher Current Options

   • LA 55-P: 50A measurement range 

   • LA 100-P: 100A measurement range 

   • LA 125-P: 125A measurement range 

   • LA 200-P: 200A measurement range 

4. Voltage Measurement Alternatives

   • LV 25-P: Closed-loop voltage sensor 

   • LV 20-P: Alternative voltage sensor 

Key Differentiating Features

The LA 25-P offers several advantages that distinguish it from competing current sensors:

1. Closed-Loop Technology: Provides higher accuracy and better linearity compared to open-loop sensors 

2. Galvanic Isolation: 2.5 kV isolation between primary and secondary circuits ensures safety in high-power applications 

3. Wide Frequency Response: DC to 200kHz bandwidth suitable for both steady-state and dynamic current measurements 

4. No Insertion Loss: Measures current without breaking the primary circuit or adding significant impedance 

5. Robust Design: Operates reliably in harsh industrial environments with wide temperature rang

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