Hall effect sensors offer precise measurement in small packages

April 30, 2013 // By Christoph Hammerschmidt
Automotive and industrial applications demanding the highest precision, the lowest energy consumption and the smallest space requirements is what Infineon aims at with its new Hall sensor product family TLE496x. They are available in the world’s smallest package for Hall Sensors, the SOT23. Typical applications are position measurements, brushless motor commutation, and index counting.

Based on Infineon's new 0.35-µm process, the new Hall sensors offer various magnetic switching thresholds in an ultra small package. They not only provide an extremely low current consumption of less than 1.6mA, they can also withstand a high operating voltage up to 32V. Additional features provided by the TLE496x product family are enhanced turn-on, reset, and turn-off characteristics compared with the previous generation as well as extensive protective functions for improved system quality, reliability, and control. 

The unipolar and bipolar switches or latches of the TLE496x family are used situation such as in window lifts, sunroofs, boot locks, windscreen wipers, safety belts, camshafts, gearshift levers, and a wide range of industrial BLDC motors. 
The Hall Sensors of the TLE496x family eliminate the need for any external resistors. Depending on the application – they also do not require a pre-resistor or a TVS protection diode, thereby further cutting system costs and PCB space. The SOT23 package of 2.9 x 1.3 x 1.0 mm³ is about 30% smaller than the smallest products available today.

With a typical current consumption of 1.6mA, the new Hall Sensors operate at about 50% of the current levels drawn by comparable products. Thanks to their high ESD robustness of 8kV human body model or HBM and the precise and stable magnetic switching points, they are suitable for high precision applications requiring robust solutions. These also include applications with long cable paths between the electronic control unit and the sensor, for example window lifts, seat belt buckles, and boot lids.

TLE496x products feature integrated error compensation that counteracts the effects of mechanical and thermal stress. The outputs are protected against over currents and over temperatures. The Hall Sensor TLE496x family is currently made up of three series: TLE4961, TLE4964, and TLE4968. All derivatives operate at the extended temperature range from -40 °C to 170 °C. With their switching thresholds of +/-1mT (bipolar switches), +/-2mT to +/-15mT