Infineon Technologies TLE4941CBAMA1

Overview

TLE4941CBAMA1 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, ±500 mT pre-induction capability, and operates from 4.5 V to 20 V supply across –40°C to +150°C ambient temperature.

For engineers reviewing the TLE4941CBAMA1 datasheet, TLE4941CBAMA1 pinout, TLE4941CBAMA1 application, or TLE4941CBAMA1 equivalent, key selection criteria include its self-calibrating zero-crossing detection, 1.8 nF integrated overmolded capacitor (TLE4941C variant), two-wire current-loop interface, and ESD robustness of ±12 kV HBM - all critical for harsh-automotive magnetic sensing deployments.

Technical Context

The TLE4941CBAMA1 implements a monolithic BiCMOS solution with dual Hall probes spaced 2.5 mm apart, feeding a differential amplifier, noise-limiting low-pass filter, and comparator driving a switched current output stage. Its digital signal path includes a speed ADC, DSP-based dynamic offset cancellation, and offset DAC feedback loop.

Startup begins in uncalibrated mode (output disabled, I = I_LOW ≈ 7 mA); after detecting ≥3 magnetic edges, it computes the arithmetic mean of input min/max to cancel offsets up to ±20 mT, then enables zero-crossing switching with <±3% jitter (1σ) at 2500–10,000 Hz under V_CC = 12 V and ∆B ≥ 2 mT.

Key Specifications

Pinout & Package

Package: PG-SSO-2-2 - surface-mount, 2-pin, pure-tin-plated leadframe (Wieland K62), RoHS-compliant, optimized for automotive magnetic field sensing orientation.

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 TLE4941CBAMA1 delivers superior EMI resilience via its integrated 1.8 nF capacitor and higher magnetic noise immunity through differential probe geometry and dynamic offset cancellation - essential for direct wheel-hub deployment in modern ABS/ESC systems.

Availability

TLE4941CBAMA1 is available at Aetrix Electronics and suitable for ABS wheel speed sensing, electronic stability control, traction control systems, and automatic transmission input speed monitoring requiring stable component supply across extended automotive lifecycles.

Supply support for TLE4941CBAMA1 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 core expertise in ruggedized analog/mixed-signal ICs for safety-critical applications.

The TLE4941 series belongs to Infineon's automotive Hall sensor product line, engineered specifically for contactless rotational speed detection in anti-lock braking and vehicle dynamics systems under extreme thermal and electromagnetic conditions.

FAQ

What is the function of the 1.8 nF capacitor in the TLE4941CBAMA1?

The 1.8 nF capacitor is overmolded directly onto the die in the PG-SSO-2-2 package and serves as an integrated EMI filter for the two-wire current interface. It reduces high-frequency noise coupling into the output stage without requiring external components or PCB layout adjustments, improving signal integrity in noisy engine bay environments.

Does the TLE4941CBAMA1 require external calibration or programming?

No. The device performs dynamic self-calibration automatically during power-up using the first three magnetic transitions it detects. This process cancels both static magnet offsets (up to ±20 mT) and internal device offsets without any external tools, firmware, or user intervention - enabling plug-and-play installation.

How does the two-wire interface work electrically?

The TLE4941CBAMA1 uses a single shared conductor for both power supply and signal return. It modulates current draw between 7 mA (LOW state) and 14 mA (HIGH state) to encode rotational information. A series resistor (R_M) on the supply line converts this current modulation into a measurable voltage swing for the ECU.

Can the TLE4941CBAMA1 operate with a north-pole or south-pole magnet?

Yes. The device supports pre-induction with either magnetic pole attached to the unmarked rear side of the package. Its differential architecture and self-calibration algorithm make it insensitive to magnet polarity orientation, simplifying mechanical integration and reducing assembly errors in high-volume automotive production.