Infineon Technologies TLE4941HALA1

Overview

TLE4941HALA1 from Infineon Technologies is a differential two-wire Hall effect sensor IC designed for wheel speed sensing in automotive ABS and vehicle dynamics control systems. It features a 2.5 mm probe spacing, ±120 mT differential induction range, ±20 mT static offset compensation, and operates from 4.5 V to 20 V over –40°C to +150°C. Its two-wire current interface delivers 7 mA low-state and 14 mA high-state output currents with <±3% jitter at 2.5 kHz.

For engineers reviewing the TLE4941HALA1 datasheet, TLE4941HALA1 pinout, TLE4941HALA1 application in wheel speed sensing, or TLE4941HALA1 equivalent for ABS sensor replacement, this page provides verified functional specifications, package mapping to PG-SSO-2-1, calibrated offset cancellation behavior, ESD robustness (±12 kV HBM), and real-world magnetic edge detection requirements (3–6 edges for initial calibration).

Technical Context

The TLE4941HALA1 implements a self-calibrating differential Hall architecture with two physically spaced probes (2.5 mm center-to-center) feeding a noise-limiting low-pass filter and comparator. Its digital signal processor extracts min/max input values during startup to compute arithmetic mean offset, which is canceled via an integrated DAC before enabling zero-crossing switching.

In calibrated mode, the DSP operates in low-jitter tracking mode; switching occurs at the differential signal's zero-crossing point, with residual jitter bounded by comparator offset and propagation delay of the filter path. Signal rejection below ∆BLimit = 0.35–1.7 mT prevents parasitic toggling under weak or noisy magnetic fields.

Key Specifications

Pinout & Package

Package: PG-SSO-2-1 - surface-mount, 2-pin, pure-tin-plated leadframe (Wieland K62), RoHS-compliant, optimized for automotive under-hood thermal and mechanical stress.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential wheel speed sensor applications.

Compared with TLE4941C and ATS685LSG-T, the TLE4941HALA1 delivers best-in-class jitter (±2%) and simplest integration (no capacitor, no programming), making it ideal for cost-sensitive, high-volume ABS modules requiring proven reliability and minimal design overhead.

Availability

TLE4941HALA1 is available at Aetrix Electronics and suitable for automotive ABS, ESC, and traction control systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified magnetic sensors.

Supply support for TLE4941HALA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and sensor solutions, with core expertise in high-reliability analog and mixed-signal ICs.

The TLE4941 series belongs to Infineon's automotive Hall sensor product line, engineered specifically for wheel speed and position sensing in safety-critical chassis control systems under extreme thermal and electromagnetic conditions.

FAQ

What is the minimum number of magnetic edges required for initial calibration?

The TLE4941HALA1 requires 3 to 6 magnetic edges for successful initial calibration. During this uncalibrated startup phase, the output remains disabled (I = I_LOW). The internal DSP captures min/max input values across these transitions to compute and cancel offset before enabling zero-crossing switching.

Does TLE4941HALA1 require an external bias magnet?

No. The TLE4941HALA1 operates with either south or north pole pre-induction on its rear side and supports ferromagnetic targets (e.g., steel tone rings) using an internal back-biasing configuration. No external magnet is needed when used with ferrous targets, though one may be used for permanent magnet targets.

How does the two-wire interface simplify ECU design?

The two-wire interface eliminates separate ground and supply lines: Pin 1 connects to battery voltage (4.5–20 V), and Pin 2 returns modulated current (7 mA / 14 mA) to the ECU's sense resistor. This reduces wiring harness weight, connector pins, and PCB routing complexity while maintaining noise-immune current-loop signaling.

What is the purpose of the ∆B_Limit parameter?

∆B_Limit (0.35–1.7 mT) defines the minimum detectable differential magnetic field amplitude. Signals below this threshold are suppressed to prevent false triggering from mechanical vibration, EMI, or weak magnetic coupling-ensuring robust operation in harsh automotive environments.