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Infineon outs Hall sensors in small SOT23 package

Posted: 03 May 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Hall sensors? magnetic switching? SOT23?

Infineon Technologies has launched a series of Hall sensors aimed at automotive and industrial applications. The TLE496x sensors are available in the world's smallest package (SOT23) for Hall sensors and are based on the 35?m process technology developed by Infineon, indicated the company.

Based on the technology, Infineon said it can now offer Hall sensors with various magnetic switching thresholds in an ultra small package. These 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, detailed the firm.

Typical applications for the TLE496x family are position measurements, brushless motor commutation and index counting. The unipolar and bipolar switches or latches of the TLE496x family are used e.g. 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 make these systems even more compact and economical, Infineon said. They 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 only 2.9 x 1.3 x 1mm is about 30 per cent smaller than the smallest products available today, added the company.

With a typical current consumption of only 1.6mA, the Hall sensors operate at about 50 per cent of the current levels drawn by comparable products. Thanks to their high ESD robustness (8kV human body model or HBM) and the precise and stable magnetic switching points, they are ideal for high precision applications requiring robust solutions, continued Infineon. These also include applications with long cable paths between the electronic control unit and the sensor, e.g. window lifts, seat belt buckles, boot lids, etc. 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 TLE496x family is made up of three series: TLE4961, TLE4964 and TLE4968. All derivatives operate at the extended temperature range from -40C to 170C. With their switching thresholds of 1mT (bipolar switches), 2mT to 15mT (latches) and 2.5/3.5mT to 22.5/28mT (unipolar switches) they cover a very wide switching threshold range for latches as well as for unipolar switches.

The TLE4961-x series consists of latches. These are ideal for measuring the position of BLDC motors and pole wheels, for index counting and for speed measurements. They are used, for instance, in window lifts and sunroofs of vehicles.

The products in the TLE4964-x series are unipolar switches. They are ideal for applications in gearshift levers, car seats and HVAC.

Finally, the TLE4968-x series exhibits very low magnetic thresholds (high sensitivity of 1mT) and bipolar switching behaviour. The bipolar switches are therefore ideal for precise measurements of rotor positions in BLDC motors and for speed and position measurements in camshafts and transmissions.

All three series TLE4961-x, TLE4964-x and TLE4968-x and various derivative devices are in high volume production. Besides the extremely small SOT23 package the TLE496x product family is also offered in the SC59 (SMD) package and the leaded SSO-3 package.

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