Infineon Technologies TLE4941-1-HT

Overview

TLE4941-1-HT from Infineon Technologies is a smart differential Hall effect sensor IC designed for active wheel speed sensing in automotive ABS and transmission systems. It operates from 4.5–20 V, delivers 7 mA (low) / 14 mA (high) current output, detects magnetic field changes with <1.5 mT minimum flux density, supports 1–5000 Hz frequency range, and features dynamic self-calibration for offset cancellation.

For engineers reviewing the TLE4941-1-HT datasheet, TLE4941-1-HT pinout, TLE4941-1-HT application, or TLE4941-1-HT equivalent, key selection criteria include two-wire current-loop interface compatibility, ultra-thin PG-SSO-2-1 package fit for tight air-gap assemblies, jitter <2% at high rotational speeds, and -40 °C to +150 °C operation without external components.

Technical Context

The TLE4941-1-HT integrates two Hall probes spaced 2.5 mm apart, feeding a differential amplifier with noise-limiting low-pass filtering and a comparator-driven switched-current output stage. Its digital signal path includes an A/D converter, DSP-based offset tracking, and D/A feedback for real-time magnetic and device offset cancellation.

It implements edge-triggered switching on the first magnetic transition (–1 version), uses internal oscillator-synchronized timing, and requires no external passive components-enabling direct integration into harsh-environment wheel bearing modules with minimal PCB footprint.

Key Specifications

Pinout & Package

Package: PG-SSO-2-1 - ultra-thin, surface-mount, 2-pin single-side leadframe package optimized for direct integration behind ferrous targets in wheel speed sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE4941C-HT, the TLE4941-1-HT trades integrated EMC capacitance for smaller footprint and lower cost; versus ATS6858LSGT, it offers simpler two-wire integration and proven AEC-Q100 Grade 0 qualification without programmability overhead.

Availability

TLE4941-1-HT is available at Aetrix Electronics and suitable for automotive ABS systems, transmission speed sensing, electric power steering motor monitoring, and driveline propshaft speed measurement requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLE4941-1-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, and sensor solutions, with global R&D and manufacturing infrastructure.

The TLE4941 product line was developed specifically for contactless, high-reliability wheel speed and rotational position sensing in safety-critical automotive subsystems under AEC-Q100 qualification.

FAQ

What distinguishes the "-1" suffix in TLE4941-1-HT?

The "-1" denotes edge-triggered output behavior: the IC switches its current output on the first detected magnetic edge (either North or South pole), eliminating ambiguity in direction-insensitive speed measurement. This differs from standard versions that may require full magnetic cycle detection before output stabilization.

Does TLE4941-1-HT require external calibration or trimming during system integration?

No. The device performs dynamic self-calibration automatically during initial magnetic transitions using an integrated DSP and feedback DAC loop. No external resistors, capacitors, or factory programming are needed-calibration occurs in situ within milliseconds after power-on.

Can TLE4941-1-HT operate reliably in environments with strong stray magnetic fields?

Yes. Its differential Hall architecture inherently rejects uniform stray fields, and the 2.5 mm probe spacing provides common-mode rejection of up to 40 dB. Real-world validation confirms stable operation near solenoid actuators and high-current cables when mounted per recommended mechanical layout.

Is the PG-SSO-2-1 package compatible with standard reflow soldering processes?

Yes. The PG-SSO-2-1 package is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. Its ultra-thin profile (0.55 mm max height) and gull-wing leads support automated placement and high-yield soldering in high-volume automotive sensor module assembly.