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Date: 27-07-22

ASIL D certification supporting angle sensor from TDK for automotive motors

High reliability sensor specialist TDK has launched a new less space occupying tiny tunnel magnetoresistance ( TMR) angle sensors TAS4240 targeting automotive motor applications such as  Brushless DC (BLDC) and permanent-magnet synchronous motor (PMSM) commutation used in electronic power steering, brake booster of automotive vehicles. The sensor can also be used for industrial servo motors, industrial automation, encoders, robotic applications.

Available in compact TSSOP8 package  with dimensions of    3 mm x 6.4 mm x 1.1 mm, TAS4240 provides two redundant analog single-ended SIN/COS outputs for extra safety. This high reliable sensor measures motor rotation angle precisely by taking very less space. TDK is presently sampling this device and production is expected to start in the month of April 2022.

TAS4240 packs four TMR half bridges and provides two separated SIN/COS outputs. ASIL D certification of the system using this device is possible, where  fail-operational concepts can also be supported by the sensor.

TDK says this sensor also offers stable output even at different temperatures and over the sensor’s lifetime. The deterministic behavior of the TAS4240 in extended magnetic-field ranges opens up new application possibilities, even in demanding environments, as per the release by the company.


Here below are some more key specifications, features, and benefits:

Contactless 360° angle measurement
High angle accuracy of ±1.0° in an ambient temperature range of -40 °C to +150 °C
Redundancy: 2x single-ended output
Low power consumption
Supports radial sensing concepts
Optimized for automotive (AEC-Q100) and industrial applications
Angle accuracy     ±1.0 degrees or less (over temperature)
±0.3 degrees (TA= 25 °C, typical)
Temperature range     –40 °C up to +150 °C (ambient)
Analog output     Single-ended, redundant, 1.5 Vp-p (at Vcc 5.0 V, Ratiometric)
Bridge resistance     5 kΩ
Magnetic-field measuring range     20 to 80 mT (recommended)0

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