TDK Electronics · TDK Europe

Thermistors

February 5, 2025

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

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TDK Corporation (TSE:6762) announces the L862 (B57862L) NTC thermistors with bendable wires and the L871 (B57871L) lead spacing NTC thermistors that can be used in a wide range of automotive and industrial applications. Both series are Pb-free and can measure temperatures between -40 °C and +155 °C with a tolerance of ±1% and ±3% respectively. At room temperature, their maximum power dissipation is 60 mW. Both series are available with different rated resistances between 1 kΩ and 100 kΩ and different R/T characteristics (see tables below and on the next page). After 10,000 h at +70 °C, 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 2.6 x 6.5 mm (D x H) in size and has insulated leads of silver-plated nickel wire (AWG 30, Ø 0.25 mm). The total length of the sensor including the wires is 50 mm, with 6 mm stripped. While the dissipation factor δth of the sensor is 1.4 mW/K, its thermal cooling time constant τc is 14 s.

Also, the sensor element of the L871 is encapsulated with a black epoxy coating. It is just 2.8 x 6.0 mm (D x H) in size and has Cu-clad steel wires (Ø 0.4 mm) with a spacing of 2.5 mm. While the dissipation factor δth of the sensor is 3 mW/K, its thermal cooling time constant τc is 9 s.

Features & Applications

Main applications

  • Temperature measurement in a wide variety of automotive and industrial applications (e.g., battery packs, power banks, energy storage, drones)

     

Main features and benefits

  • Short response time
  • High measuring accuracy
  • Different tolerances available

     

Key Data

Ordering code

R25 [Ω]

No. of R/T characteristic

B25/100 [K]

B57862L0102+0001 k10233930 ±1%
B57862L0202+0002 k10383560 ±1%
B57862L0502+0005 k80163988 ±1%
B57862L0103+00010 k80163988 ±1%
B57862L0104+000100 k20144540 ±1%
L862 series (B57862L*) (+ = Resistance tolerance, F = ±1%, H = ±3%)

Ordering code

R25 [Ω]

No. of R/T characteristic

B25/100 [K]

B57871L0202+0002 k10383560 ±1%
B57871L0502+0005 k80163988 ±1%
B57871L0103+00110 k80163988 ±1%
B57871L0303+00030 k80183964 ±1%
B57871L0104+000100 k20144540 ±1%
L871 series (B57871L*) (+ = Resistance tolerance, F = ±1%, H = ±3%)

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