Why Infineon’s XENSIV TLE4999I3 linear Hall sensor is built for fail-safe steering

Reviewed: ad hoc news B2B & Pro desk. Edited and checked on 2026-06-20, 16:57. Details in the imprint.

With the XENSIV TLE4999I3, Infineon puts a linear Hall sensor on the steering rack that quietly carries ASIL D responsibility in just a few square millimetres of silicon. It measures, cross-checks itself, and still has to survive years of salt, heat, and vibration.

What this tiny sensor does

The XENSIV TLE4999I3 is a dual-channel linear Hall sensor designed to measure magnetic fields and output precise position data, mainly for electric power steering and pedal applications in cars.

Placed near a simple magnet on a steering rack or shaft, it converts movement into two independent signals that ECUs can compare and plausibility-check in real time.

Redundancy for ASIL D systems

Infineon built the TLE4999I3 with two separate sensing elements and signal paths in one package, so one chip can support ASIL D architectures without needing a second discrete sensor next to it.

Both channels constantly monitor each other, and integrated diagnostics can flag wiring faults, out-of-range conditions, or internal errors before they turn into steering surprises for the driver.

Accuracy under heat and vibration

In a steering rack, the sensor sits close to hot engines, wet roads, and mechanical shocks, so Infineon specifies the TLE4999I3 for typical automotive temperature ranges and long-term stability across years of operation.

Digital trimming and internal temperature compensation aim to keep output drift low enough that the control unit still trusts the value after hundreds of thousands of kilometers.

Interface options and integration

The TLE4999I3 offers ratiometric analog outputs and digital SENT interfaces, giving automakers flexibility to match existing ECU platforms as well as newer digital sensor networks.

The small package size also helps designers tuck the sensor into tight steering housings where every millimeter counts, especially in compact cars and e-axle platforms.

Where trade-offs remain

The TLE4999I3 is optimized for linear position measurement, so applications needing full 360-degree angle sensing on shafts may still require different magnetic concepts or companion chips.

Integrating dual-channel sensors can simplify wiring, but diagnostics and functional safety concepts still need careful system-level design and software validation on the automaker side.

Infineon’s broader positioning

With the XENSIV TLE4999I3, Infineon sharpens its profile as a safety-focused supplier for steering, braking, and chassis electronics, sitting alongside its power MOSFETs and microcontrollers in many vehicle platforms.

Shares of Infineon Technologies (DE0006231004) trade on Xetra; the company is part of Germany’s DAX index and closely watched by investors in automotive semiconductors.

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