Hall-effect sensors for cars, industry, white goods

Hall-effect sensors for cars, industry, white goods

New Products |
By Peter Clarke

The new sensors consume no more than 1.6 mA, about 50 % less than comparable products, claims Infineon. The 5V – which are designed for automotive applications – content themselves with even less – 1.4 mA. According to the vendor, all models of the TLx496x series feature high ESD robustness and precise, stable magnetic switching points which makes them suitable for for systems where energy efficiency, robustness and precision matter. Due to their high integration, the devices make two to four of the previously needed passive components redundant; the TLx496x Hall sensors therefore help reducing system costs as well as the PCB space needed.

All of the TLx496x Hall sensors integrate the Hall element, a voltage regulator, choppers, an oscillator and an output driver. The voltage regulator powers the Hall element and the active circuits. The chopper ensures that the temperature remains stable and minimizes the effects of process fluctuations, which occur for three reasons: First, each single Hall sensor has a slightly different magnetic switching point as a result of the manufacturing process; second, the permanent magnets in the brushless DC (BLDC) motor lose magnetic field strength as the temperature rises and third, the Hall output voltage is affected by stress and temperature. The TLx496x Hall sensors compensate all of these effects.


The variants with an “E” in the type designation (TLE496x-xM) are suitable for automotive applications with an operating voltage of 3.0 V to 5.5 V, which generally are not exposed to overcurrent. Target applications include power windows and sunroofs, trunk locks, windshield wipers, seatbelts, camshafts, shift levers and the many controls used in BLDC motors and, more general, all systems that need a precise Hall-effect sensor for an expanded temperature range of -40 °C to 170 °C.

The TLI496x-xM series is functionally the same as the TLE496x-xM but is specified for a temperature range of -40 °C to 125 °C and is JESD47 qualified. The TLI496x-xM is typically used in BLDC motors in e-bikes and fans in PCs, in electric drives in building automation (such as blinds and garage doors) as well as the detection of open/close states in white goods and building security applications.

The TLV496x-xTA/B series was specifically developed for cost-effective, contactless positioning. Typical applications are BLDC motors in white goods (such as dishwashers and washing machines), compressors in air-conditioners, fans in PCs as well as blinds, garden tools and building (e. g. door and window contacts, gates and roller shutters). Despite the pressure to cut costs, these applications need very precise Hall latches or Hall switches (unipolar/bipolar) for temperatures ranging from -40 °C to 125 °C. The TLV496x-xTA/B versions have a power consumption of 1.6 mA and an ESD protection up to 4 kVH HBM (Human Body Model). The output has overcurrent protection and automatically switches off at high temperatures.

All three series are available in high volume. Development support includes online simulation tools and application manuals.

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