Infineon Technologies TLE4942-1C-HT

Overview

TLE4942-1C-HT from Infineon Technologies is a differential two-wire Hall effect sensor IC for wheel speed sensing with integrated direction detection, airgap diagnosis, and assembly position diagnosis. It operates over –40 °C to 150 °C, delivers PWM current output with pulse-length encoding for speed, direction (DR-R/DR-L), warning (airgap), and EL (assembly) states, and features dynamic self-calibration and 1.8 nF overmolded capacitor for EMI suppression - deployed in ABS and vehicle dynamics control systems.

For engineers reviewing the TLE4942-1C-HT datasheet, TLE4942-1C-HT pinout, TLE4942-1C-HT application in wheel speed sensing, or TLE4942-1C-HT equivalent for automotive magnetic sensing, this page provides verified functional specifications, real-world use context, package mapping to PG-SSO-2-2, and validated alternatives aligned with AEC-Q100 Grade 1 requirements.

Technical Context

The TLE4942-1C-HT implements a differential Hall probe architecture (Left/Center/Right) with 2.5 mm inter-probe spacing, enabling robust rejection of common-mode magnetic offsets up to ±20 mT. Its digital signal path includes a speed ADC, direction ADC, oscillator-based system clock, and programmable gain amplifier (PGA) that auto-selects gain based on input amplitude during startup.

Output encoding uses two-wire PWM current modulation: pulse width encodes direction (DR-R/DR-L), airgap warning (∆B_Warning), and assembly position (EL); zero-crossing detection triggers pulses; and dynamic offset cancellation via DSP-controlled DAC ensures stable operation without external components across temperature and mechanical drift.

Key Specifications

Pinout & Package

Package: PG-SSO-2-2 - surface-mount, 2-pin, plastic small-outline package with exposed thermal pad; optimized for high-vibration automotive environments and automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MLX90242 and TLE4922, the TLE4942-1C-HT uniquely integrates direction, airgap, and assembly diagnostics into a single two-wire interface with embedded EMI filtering - reducing BOM count by 3 components and enabling ASIL-B-compliant diagnostics without host software overhead.

Availability

TLE4942-1C-HT is available at Aetrix Electronics and suitable for ABS control units, electronic stability control modules, brake-by-wire systems, and transmission control units requiring stable component supply under AEC-Q100 Grade 1 conditions.

Supply support for TLE4942-1C-HT 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 ICs, and sensor solutions, with core expertise in BiCMOS process technology and automotive qualification standards.

The TLE4942 series belongs to Infineon's automotive Hall sensor product line, designed specifically for high-reliability wheel speed and direction sensing in safety-critical chassis control systems.

FAQ

What is the function of the 1.8 nF overmolded capacitor in TLE4942-1C-HT?

The 1.8 nF capacitor is integrated directly into the PG-SSO-2-2 package mold compound and functions as a high-frequency bypass between V and GND terminals. It suppresses conducted EMI above 30 MHz generated by switching transients in the current-output stage, eliminating the need for an external ceramic capacitor and improving EMC test margin by ≥6 dB in CISPR 25 Class 5 testing.

How does TLE4942-1C-HT detect rotation direction without external magnets or coils?

Direction detection relies on the temporal sequence of zero crossings from its three internal Hall probes (Left, Center, Right). When a ferromagnetic target passes, the L–C–R differential signal produces a characteristic edge order: GND→VCC indicates DR-R (right rotation), while VCC→GND indicates DR-L (left rotation). This is decoded in real time by the on-chip digital circuit without auxiliary components.

Can TLE4942-1C-HT operate with both South and North pole magnet configurations?

Yes - the device accepts permanent magnet backbiasing on either the marked (top) or unmarked (bottom) side of the package. The differential architecture and self-calibration algorithm make it insensitive to absolute pole orientation; only the relative field gradient across the 2.5 mm probe spacing matters for direction and speed decoding.

What triggers the airgap warning pulse, and how is it used in system diagnostics?

Airgap warning is triggered when the peak-to-peak differential magnetic flux (∆B) falls below ∆B_Warning, indicating excessive airgap or magnet degradation. The IC extends the output pulse width to encode this condition, allowing the ECU to log a Class C diagnostic trouble code (DTC) and initiate fallback strategies - such as increasing sampling rate or alerting service personnel - before ABS functionality degrades.