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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Infineon Technologies TLE4942

Name: TLE4942
Brand: Infineon Technologies
SKU: TLE4942
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLE4942

Manufacturer:: Infineon Technologies

Category:: Switches (Solid State)

Package:: -

Datasheet:: TLE4942.pdf

Description:: MAGNETIC SWITCH HALL EFFECT SENS

Quantity:: RFQ Add To RFQ list

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Inventory:145

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Product details

Overview

TLE4942 from Infineon Technologies is a differential two-wire Hall effect sensor IC for automotive wheel speed and direction sensing. It delivers PWM-encoded current output with airgap diagnosis, assembly position detection, and dynamic self-calibration. Operates from 4.5 V to 16.5 V over –40 °C to +150 °C, supports up to ±20 mT magnetic offset cancellation, and uses BiCMOS monolithic integration.

For engineers reviewing the TLE4942 datasheet, TLE4942 pinout, TLE4942 application, or TLE4942 equivalent, this device is selected for ABS and vehicle dynamics control where robust zero-crossing detection, integrated piezo compensation, and dual-pole (N/S) magnet compatibility are required.

Technical Context

The TLE4942 implements a three-probe differential architecture: two spaced Hall elements (2.5 mm center-to-center) form a speed-sensing pair, while a third central probe measures relative flux for direction analysis. The arithmetic mean of left/right signals minus center signal (X = (L+R)/2 − C) feeds the direction ADC.

Its digital signal processor performs real-time min/max tracking, offset calculation, and PWM encoding - generating pulse-length-modulated output pulses that encode speed, rotation direction (DR-L/DR-R), airgap warning (∆B_Warning), and limit detection (∆B_Limit) without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 16.5 V - enables direct battery connection in 12 V automotive systems with reverse-polarity protection up to –200 mA.
Operating Temperature	–40 °C to +150 °C - qualified for under-hood placement in ABS wheel speed modules.
Magnetic Offset Compensation	±20 mT - cancels static magnet misalignment and mechanical mounting tolerances during self-calibration.
Probe Spacing	2.5 mm - optimized baseline for detecting gear tooth transitions at typical ABS airgaps (0.4–2.0 mm).
Output Interface	Two-wire PWM current sink - transmits speed, direction, and diagnostic data over single loop without separate ground return wire.
Junction Thermal Resistance	190 K/W (P-SSO-2-1) - defines maximum power dissipation limit under natural convection; overmolding reduces R_thJA.

Pinout & Package

Package: P-SSO-2-1 - surface-mount, 2-pin, plastic small outline package with exposed thermal pad, designed for high-reliability automotive mounting and automated optical inspection.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Supply input	Internal regulator input; accepts 4.5–16.5 V; reverse-polarity protected to –200 mA.
GND	Current return path	Serves as both substrate reference and output current sink return; forms two-wire loop with VCC.

Key Features

Feature	Design Value
Differential three-Hall-probe architecture	Enables simultaneous speed measurement and unambiguous direction detection via phase analysis between speed and direction signals.
Dynamic self-calibration algorithm	Performs full offset correction within seconds using only signal transitions; eliminates need for factory calibration or trim resistors.
Airgap and assembly position diagnosis	Encodes ∆B_Warning and ∆B_EL thresholds into PWM pulse length - provides real-time feedback on mechanical installation integrity.
Piezo effect compensation	Integrated circuit-level compensation minimizes vibration-induced false triggering in chassis-mounted ABS sensors.

Applications

ABS Wheel Speed Sensing

Electronic Stability Control (ESC)

Use Scenario: Mounted adjacent to rotating ferromagnetic tone ring on vehicle wheel hub or CV joint.

IC Role / Device Role / Timing Role: Differential Hall sensor providing zero-crossing-triggered PWM current output encoding rotational speed and direction.

Use Value: Enables closed-loop slip control by delivering jitter-free speed/direction data even at low RPM (<1 rpm) and across wide airgaps (up to 2.0 mm).

Use Scenario: Integrated into ESC hydraulic modulator control unit for yaw rate and wheel slip correlation.

IC Role / Device Role / Timing Role: Primary speed input for lateral dynamics estimation; outputs diagnostic pulse extensions when airgap exceeds specification.

Use Value: Supports fail-safe operation by flagging marginal mechanical installation before functional degradation occurs.

Transmission Input/Output Speed Sensing

Electric Power Steering (EPS) Motor Position

Use Scenario: Monitoring geartrain speed at transmission input and output shafts for torque converter lock-up and shift timing.

IC Role / Device Role / Timing Role: Dual-channel speed monitor using two TLE4942 devices; one per shaft, each reporting independent direction and airgap status.

Use Value: Allows precise slip ratio calculation with built-in diagnostics to distinguish sensor fault from mechanical wear.

Use Scenario: Sensing rotor position in brushless EPS motor via embedded pole wheel.

IC Role / Device Role / Timing Role: Direction-aware speed sensor feeding motor commutation logic; leverages DR-L/DR-R pulse encoding for bidirectional rotation tracking.

Use Value: Eliminates need for separate direction sensor or quadrature decoding, reducing BOM count and PCB space.

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential Hall speed and direction sensing applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLE4942C	Includes 1.8 nF overmolded capacitor for enhanced EMI immunity; identical pinout and functional behavior.	Preferred for high-noise environments (e.g., near inverters or DC-DC converters) where conducted EMI may corrupt PWM pulse timing.	Select TLE4942C when board-level filtering is impractical and system-level EMC testing shows marginal margin.
ATS685LSG-T	Single-chip GMR-based sensor with integrated voltage regulator; outputs analog ratiometric voltage, not current-mode PWM.	Requires external ADC and microcontroller-based decoding; lacks native airgap/assembly diagnostics.	Choose only if existing architecture already processes analog speed signals and diagnostic features are handled elsewhere.

Compared with TLE4942C, the base TLE4942 offers identical core functionality at lower cost where EMI is controlled; versus ATS685LSG-T, it delivers plug-and-play current-loop communication and embedded diagnostics without firmware overhead.

Availability

TLE4942 is available at Aetrix Electronics and suitable for ABS wheel speed modules, electronic stability control units, transmission speed monitoring systems, and electric power steering motor position sensing requiring stable component supply across extended automotive lifecycles.

Supply support for TLE4942 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 is a German semiconductor manufacturer specializing in power management, automotive ICs, and sensor solutions, with global automotive qualification expertise and AEC-Q100 compliance leadership.

The TLE4942 belongs to Infineon's TLE family of Hall-effect sensor ICs engineered specifically for demanding automotive motion sensing - emphasizing diagnostic integrity, thermal resilience, and integration simplicity in safety-critical chassis control systems.

FAQ

What is the minimum number of signal transitions required for TLE4942 self-calibration?

The TLE4942 requires only a few magnetic transitions - typically two full cycles (four zero crossings) - to complete its dynamic self-calibration sequence. During this time, the output remains disabled until offset convergence is confirmed. This enables rapid startup after power-on or wake-from-sleep, supporting fast system initialization in modern vehicle networks.

How does the TLE4942 distinguish between DR-L and DR-R rotation directions?

The TLE4942 analyzes phase relationship between the speed signal (from left/right Hall pair) and the direction signal (from center probe vs. mean of left/right). When target motion progresses from GND-pin side toward VCC-pin side, DR-R pulses are generated; reverse motion yields DR-L pulses. Pulse length modulation encodes this information without requiring external logic or additional sensors.

Can the TLE4942 operate with both north and south pole magnets?

Yes - the TLE4942 supports back-biasing with either north or south pole of a permanent magnet attached to the unmarked rear side of the package. Its differential architecture and self-calibration eliminate polarity dependency, enabling flexible mechanical design and eliminating magnet orientation verification during assembly.

What is the function of the ∆B_Limit threshold in TLE4942 operation?

The ∆B_Limit threshold defines the lower bound of detectable differential magnetic flux density. Signals below this level trigger no output pulses, preventing false switching due to excessive airgap, magnet demagnetization, or shielding interference. It serves as a hard functional cutoff - distinct from ∆B_Warning and ∆B_EL, which provide graded diagnostic feedback via pulse extension.

TLE4942 Specifications

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Product Status:: Active

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TLE4942 FAQ

1.How can I place an order for TLE4942 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLE4942 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TLE4942 reliable?

The price and inventory of TLE4942 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4942 is usually 5 days.

3.What payment methods are accepted for TLE4942?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4942 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLE4942?

TLE4942 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLE4942 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TLE4942?

For technical support, including TLE4942 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4942 requirements.

6.How does Aetrix verify that TLE4942 is sourced from the original manufacturer or authorized distributors?

All TLE4942 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TLE4942 meets industry standards.

7.What is the process for return or replacement of TLE4942?

All TLE4942 units undergo pre-shipment inspection (PSI). If there is an issue with TLE4942, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TLE4942 part is unused and in its original packaging.

Return procedure for TLE4942:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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