LTS 25-NP Current Transducer – Comprehensive Technical Summary
(Extracted from LTS 25-NP datasheet, Rev. 070129/19)

1. Device Overview• Type: Closed-loop (compensated) Hall-effect current transducer• Primary nominal current (IPN): 25 A rms• Measuring range: 0 … ±80 A• Galvanic isolation: 3 kV rms / 1 min, 8 kV impulse (1.2/50 µs)• Case: UL 94-V0 isolated plastic, PCB-mount, 10 g• Standards: EN 50178:1997, IEC 60950-1:2001, IEC 61000-4-3 (180–220 MHz not guaranteed)
2. Electrical Characteristics (@ TA = 25 °C, VC = 5 V unless noted)Parameter | Symbol | Value | Unit | Conditions---|---|---|---|---Primary nominal current | IPN | 25 | A rms | –Measuring range | IPM | 0 … ±80 | A | –Output voltage @ IPN | VOUT | 2.5 ± 0.625 | V | RL ≥ 2 kΩSensitivity | G | 25 | mV/A | –Load resistance | RL | ≥ 2 | kΩ | –Internal measuring resistor | RIM | 50 | Ω | ±0.5 %Supply voltage | VC | 5 | V | ±5 %Current consumption | IC | 28 + IS + (VOUT/RL) | mA | IS = IP/NS, NS = 25 turnsTemperature coefficient of RIM | TCRIM | < 50 | ppm/K | –Output noise | – | < 100 | mV pp | 0 … 100 kHz BW
3. Accuracy & Dynamic PerformanceParameter | Typ | Max | Unit | Conditions---|---|---|---|---Accuracy @ IPN, 25 °C | ±0.2 | ±0.7 | % | with RIMLinearity error | < 0.1 | – | % | –Temperature coefficient of VOUT (0 … 85 °C) | 50 | 150 | ppm/K | –Temperature coefficient of G | 50 | – | ppm/K | –40 … 85 °CMagnetic offset after 3× IPN | ±0.5 | ±2.0 | mV | –Reaction time (10 % of IPN) | < 100 | – | ns | –Response time (90 % of IPN step) | < 400 | – | ns | –di/dt accurately followed | > 60 | – | A/µs | –Frequency bandwidth (–0.5 dB) | DC … 100 | – | kHz | –Frequency bandwidth (–1 dB) | DC … 200 | – | kHz | –
4. Environmental & Mechanical DataParameter | Value | Unit---|---|---Ambient operating temperature | –40 … +85 | °CStorage temperature | –40 … +100 | °CCreepage distance (dCp) | 15.5 | mmClearance distance (dCl) | 6.35 | mmComparative Tracking Index (CTI) | 175 | –Insulation group | III a | –Mass | 10 | gPrimary pins | 3 × 0.8 × 0.8 mm | Recommended PCB hole Ø1.3 mmSecondary pins | 3 × 0.5 × 0.35 mm | Recommended PCB hole Ø0.8 mmPrimary through-hole | Ø3.2 mm | –General tolerance | ±0.2 | mm
5. Application Domains• AC variable-speed & servo drives• DC motor static converters• Battery-powered systems• Uninterruptible power supplies (UPS)• Switched-mode power supplies (SMPS)• Welding power sources
6. Safety & Installation Notes• Over-voltage category OV 3, pollution degree PD2, non-uniform field• Rated isolation voltage: 600 V (single), 300 V (reinforced) per EN 50178 & IEC 61010-1• Primary jumper temperature must not exceed 100 °C• Device is a built-in component; hazardous voltages may be present—provide protective housing and disconnect means