The first in a new line of immersion temperature sensors, the B58101A0851A000 from TDK is designed specifically for EV powertrain cooling. Compact and lightweight (<11 g), this fully sealed NTC thermistor provides fast, precise temperature measurement in oil-cooled systems.
Oil cooling is emerging as the preferred method for EV drivetrain thermal management, offering superior performance over conventional water-glycol systems. By directly cooling motors and inverters, it enhances efficiency, extends component lifespan, and supports higher power densities—key for next-gen EVs.
The B58101A0851A000 sensor has a thermal time constant of <4 s (τ63%) in water and maintains accuracy within ±1 K from -40°C to ≤125°C. It operates up to +150°C and withstands system pressures up to 10 bar. With a nominal resistance of 5 kΩ at 25°C and a tolerance of ±1%, the device ensures reliable performance across a wide range of conditions.
Designed for durability, the immersion temperature sensor resists ZF EcoFluid E gear oil used in electric drive systems. Its resistance-temperature curve is customizable, and it adapts to various installation positions, cooling fluids, and mounting configurations.
The B58101A0851A000 sensor is available now from DigiKey and Mouser Electronics.
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