Pb-free NTC thermistors for a wide range of automotive and industrial applications

TDK Corporation has released the L862 (B57862L) NTC thermistors with bendable wires and the L871 (B57871L) lead spacing NTC thermistors that can be employed in a wide range of automotive and industrial applications. Both series are Pb-free and can measure temperatures between -40C and +155C with a tolerance of ±1% and ±3%, respectively. At room temperature, their maximum power dissipation is 60mW. Both series are available with different rated resistances between 1kOhm and 100kOhm and different R/T characteristics. After 10,000h at +70C, the deviation of the resistance at room temperature R25 is less than 3%.

The sensor element of the L862 that is encapsulated with a black epoxy coating is just 2.6mm x 6.5mm (D x H) in size and has insulated leads of silver-plated nickel wire (AWG 30, Ø 0.25mm). The total length of the sensor, including the wires, is 50mm, with 6mm stripped. While the dissipation factor δth of the sensor is 1.4mW/K, its thermal cooling time constant τc is 14s.

Also, the sensor element of the L871 is encapsulated with a black epoxy coating. It is just 2.8mm x 6mm (D x H) in size and has Cu-clad steel wires (Ø 0.4mm) with a spacing of 2.5mm. While the dissipation factor δth of the sensor is 3mW/K, its thermal cooling time constant τc is 9s.

The main features and benefits include a short response time, high measuring accuracy, and different tolerances available.

Main applications include temperature measurement in a wide variety of automotive and industrial applications, e.g., battery packs, power banks, energy storage, and drones.