LT108-S7/SP12 – LEM High-Precision Hall Effect Current Sensor

LT108-S7/SP12 A High-Performance Current Sensing Solution for Industrial & Power Electronics Applications

As the global energy transition and industrial automation accelerate, accurate, stable, and reliable current detection has become critical to system performance. LEM, a world-leading manufacturer of current sensors, brings decades of technical expertise and industry experience to the LT108-S7/SP12 Hall effect current sensor. With exceptional closed-loop measurement accuracy, strong noise immunity, and robust safety design, it is the trusted choice for engineers worldwide.

LT108-S7/SP12 Key Technical Specifications

LT108-S7/SP12 Closed-Loop Hall Technology – Redefining Precision

The LT108-S7/SP12 employs closed-loop (compensated) Hall effect current sensing – a technology that delivers an optimal balance of precision, response speed, and stability. Unlike common open-loop sensors, the closed-loop design continuously corrects magnetic field deviation through an internal compensation coil, delivering output signals with near-zero error.

Real-world testing confirms this advantage: after 48 hours of continuous operation on a production line, the temperature drift of the LT108-S7 resulted in <0.15% gain shift, compared to 0.38% for a conventional competitor. This means that in industrial environments with frequent temperature fluctuations, the LT108-S7/SP12 consistently delivers accurate measurement data, avoiding misjudgments and efficiency losses caused by drift.

LT108-S7/SP12 Blazing Fast Response – Capture Every Current Transient

In applications such as variable frequency drives, inverters, and motor drives, current waveforms often change rapidly and abruptly. The LT108-S7/SP12 features a response time of <1μs and a bandwidth from DC to 100kHz, enabling precise measurement of DC, AC, pulsed, and arbitrary waveforms.

A case study from an elevator control system retrofit showed that after adopting the LT108-S7/SP1 series without changing the existing power architecture, real-time motor current monitoring improved fault diagnosis accuracy to 99.2%. This translates to less downtime, lower maintenance costs, and higher productivity – accurate current data not only delivers precise readings but also enhances overall system reliability.

LT108-S7/SP12 Ultra-Low Insertion Loss – No Compromise on Energy Efficiency

Sensor power consumption and insertion loss are critical design considerations in any current monitoring system. The LT108-S7/SP12 has an insertion loss of just 1mΩ, dissipating negligible power at its rated 100A and virtually no impact on the primary circuit.

For energy-sensitive applications like PV inverters, EV charging stations, and wind turbines, this advantage is particularly significant. In a photovoltaic inverter production line in Jiangsu province, replacing sensors with the LT108-S7/SP1 series resulted in system efficiency fluctuation stably controlled within 0.8% across ambient temperatures from -25℃ to 75℃, with an estimated annual power generation increase of 150,000 kWh.

LT108-S7/SP12 3.52kV Isolation Voltage – Safeguarding System Security

Safety is the highest priority in power electronics. The LT108-S7/SP12 provides 3.52kVrms electrical isolation between the primary (high-current) and secondary (measurement output) circuits, significantly enhancing overall system safety and surge immunity.

Additionally, the sensor is housed in a UL94-V0 compliant insulating case, meeting internationally recognized high standards for flame retardancy and insulation. Whether used in industrial drive cabinets, EV charging piles, or railway traction control systems, the LT108-S7/SP12 builds a solid safety barrier for your equipment.

LT108-S7/SP12 Strong Anti-Interference Design – Peace of Mind in Harsh EMI Environments

Industrial sites are often plagued by high-frequency harmonics from VFDs, pulse interference from high-power switching devices, and complex electromagnetic radiation – all challenges to accurate current measurement.

The LT108-S7/SP12’s anti-interference design is EN 61000-4-8 certified, effectively suppressing external EMI effects on the output signal. Even dense harmonic content from VFDs does not materially impact measurement accuracy. This makes the LT108-S7/SP12 excel in extremely harsh electromagnetic environments such as welding power supplies, electroplating power supplies, and high-frequency induction heating.

LT108-S7/SP12 Wide Temperature & Voltage Range – Ready for Tough Conditions

To do a good job, you need the right tools. Stable sensor operation under harsh conditions is essential. The LT108-S7/SP12 supports a wide input voltage range of ±12V to ±15V and an operating temperature range of -10℃ to +70℃ (storage from -25℃ to +85℃), sufficient for most industrial outdoor applications.

In outdoor charging stations in rainy southern regions, the SP1 version passed IP67 protection certification and was successfully deployed. While the SP12 version differs in protection rating, the core electrical performance and reliability remain the same – no matter your environment, the LT108-S7/SP12 delivers reliable results.