Compact Analog TMR Angle Sensor for Precise Measurements

TDK has introduced a new compact and cost-effective tunnel-magnetoresistance (TMR) angle sensor, the TAS8240, featuring four Wheatstone bridges for precise angle detection in a surface mount package. This sensor offers high angle accuracy of ±1.0° within an ambient temperature range of -40 °C to +150 °C, ensuring stability over varying conditions.

The TAS8240 is designed with four redundant analog single-ended SIN/COS outputs, making it ideal for safety-critical applications in ASIL-D automotive and industrial settings. It is available in two package options: the compact QFN16 (3 x 3 mm²) and TSSOP16 (5 x 6.4 mm²), catering to different space requirements.

Specifically tailored for 360° angle sensing, the TAS8240 is well-suited for accurately determining the rotor position of BLDC motors commonly used in critical systems like power steering, brake boosters, and traction motors. Its deterministic behavior in extended magnetic-field ranges opens up new possibilities for applications in challenging environments.

The sensor incorporates four pairs of TMR half bridges, delivering four separate SIN/COS outputs based on the applied magnetic field in the x-y plane. Building on the success of the TMS4240, a four-bridge TMR angle sensor launched in 2022, the TAS8240 enhances system safety levels up to ASIL D while ensuring continuous availability of position information.

In terms of packaging, the surface mount QFN16 package offers a significantly smaller footprint compared to the TSSOP16, making it ideal for space-constrained applications. The wettable flank feature enhances soldering quality, meeting automotive-grade standards. Moreover, depending on system architectures, the sensor can support fail-operational concepts, further enhancing reliability.