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Infineon Technologies TLE4943CXAMA1
- Part No.:
- TLE4943CXAMA1
- Manufacturer:
- Infineon Technologies
- Category:
- Switches (Solid State)
- Package:
- -
- Datasheet:
-
TLE4943CXAMA1.pdf
- Description:
- MAG SWITCH SPECIAL PURP SPEED
- Quantity:
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Product details
Overview
TLE4943CXAMA1 from Infineon Technologies is a Hall-based differential wheel speed sensor IC with integrated three-Hall-element architecture, AK protocol two-wire current interface (IL/IM/IH levels), ±30 mT magnetic offset cancellation, and operation from 6.5 V to 20 V supply. It delivers speed, rotation direction, and air gap diagnostics for ferromagnetic toothed wheels in automotive ABS and ESC systems.
For engineers reviewing the TLE4943CXAMA1 datasheet, TLE4943CXAMA1 pinout, TLE4943CXAMA1 application, or TLE4943CXAMA1 equivalent, key selection criteria include differential Hall sensing accuracy at wide air gaps, AK protocol timing compliance, self-calibration behavior during cold start, and EMC robustness with integrated 1.8 nF overmolded capacitor.
Technical Context
The TLE4943CXAMA1 implements a three-Hall-element topology with 2.5 mm spacing between outer elements and center element, enabling true differential field measurement and deterministic direction detection via phase-shift analysis. Its analog front-end includes chopper-stabilized amplifiers and adaptive thresholding for signal integrity across temperature and air gap variation.
AK protocol operation defines three output current levels (IL ≈ 7 mA, IM ≈ 14 mA, IH ≈ 21 mA) encoding speed pulses, direction bits, and air gap status within Manchester-coded frames. The device transitions from uncalibrated to calibrated mode after detecting ≥3 magnetic edges, suppressing offset drift without external calibration components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6.5 V to 20 V - supports direct battery connection in 12 V automotive systems with load dump tolerance. |
| Operating Temperature | −40 °C to +150 °C (junction) - qualified for under-hood placement near wheel hubs and transmission housings. |
| Magnetic Offset Cancellation | ±30 mT - enables reliable operation despite mechanical stress-induced magnet shifts or aging effects. |
| Air Gap Range | Up to 4.5 mm with ferromagnetic target - accommodates suspension travel and manufacturing tolerances in production vehicles. |
| Output Interface | Three-level current sink (IL/IM/IH) per AK protocol - eliminates need for external current-sense resistor or voltage conversion circuitry. |
| Self-Calibration Time | < 100 ms after power-up - ensures valid direction and speed data within first wheel revolution post-ignition. |
| Integrated Capacitor | 1.8 nF overmolded - reduces PCB footprint and improves conducted EMI immunity without discrete decoupling. |
Pinout & Package
Package: PG-SSO-2-53 (leadless, surface-mount, 2-pin, exposed thermal pad). Pin configuration is symmetrical dual-terminal: both pins are electrically identical and function as bidirectional current path for AK protocol signaling and power return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 / Pin 2 | Two-Wire Current Interface Terminal | Shared supply input and signal output node; carries modulated current (IL/IM/IH) per AK protocol; requires external pull-up to battery rail. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Hall Sensing | Three-element array with 2.5 mm outer spacing enables robust direction detection independent of target asymmetry or eccentricity. |
| AK Protocol Compliance | Manchester-encoded frame structure with embedded direction bit and air gap quality flag - enables single-wire diagnostics without additional bus lines. |
| Offset Self-Calibration | Automatic cancellation of up to ±30 mT DC offset within first 3 magnetic edges - eliminates factory calibration and reduces test time. |
| Wide Air Gap Operation | Valid speed/direction output at 4.5 mm air gap with standard ferromagnetic gear - simplifies mechanical mounting and reduces assembly cost. |
| EMC-Optimized Packaging | Overmolded 1.8 nF capacitor integrated into package mold compound - suppresses high-frequency noise at source without layout-sensitive external components. |
Applications
| ABS Wheel Speed Monitoring | ESC Vehicle Dynamics Control |
|---|---|
Use Scenario: Real-time monitoring of individual wheel rotational speed during braking events on wet or icy surfaces. IC Role / Device Role / Timing Role: Primary speed and direction sensor feeding closed-loop slip control algorithm in ABS ECU. Use Value: Enables precise wheel lock detection and pressure modulation within ≤5 ms response window due to sub-100 ms calibration and deterministic pulse timing. |
Use Scenario: Detecting yaw rate discrepancies between driven and non-driven axles during aggressive cornering or split-μ maneuvers. IC Role / Device Role / Timing Role: Direction-resolved speed input for lateral acceleration estimation and torque vectoring coordination. Use Value: Provides validated rotation direction data critical for distinguishing oversteer vs. understeer conditions without reliance on inertial sensors. |
| Transmission Input Speed Sensing | Electric Power Steering Motor Commutation |
Use Scenario: Measuring input shaft speed in automatic transmissions to synchronize clutch engagement and gear shift timing. IC Role / Device Role / Timing Role: High-accuracy speed feedback source for transmission control unit (TCU) closed-loop timing logic. Use Value: Delivers stable frequency output up to 20 kHz with <±0.5% linearity error across −40°C to +150°C, ensuring shift consistency. |
Use Scenario: Rotor position feedback for brushless DC motor commutation in column-assist EPS systems. IC Role / Device Role / Timing Role: Direction-aware speed sensor replacing resolvers in cost-sensitive EPS designs. Use Value: Eliminates need for separate direction sensor by embedding rotation sense in same current loop, reducing BOM count and harness complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential wheel speed sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATS612LSGTN-T | Single-Hall architecture with digital PWM output; no direction or air gap reporting; requires external bias magnet. | Lacks AK protocol diagnostics; suitable only for basic speed-only ABS variants without yaw or traction control. | Select when system architecture uses dedicated direction sensors or relies on wheel speed differentials rather than per-wheel direction. |
| TLE4964-2C | Two-wire current interface with SENT-compatible protocol; higher resolution air gap reporting but no built-in 1.8 nF capacitor. | Requires external EMC filtering; supports more granular air gap quantization (16 levels vs. AK's 3-state flag). | Prefer when diagnostic depth exceeds AK protocol capabilities and board-level decoupling is already optimized. |
Compared with ATS612LSGTN-T and TLE4964-2C, the TLE4943CXAMA1 uniquely integrates direction, air gap, and speed in one AK-compliant current signal while delivering superior EMC performance via monolithic 1.8 nF capacitance - reducing system-level validation effort for full-featured ABS/ESC platforms.
Availability
TLE4943CXAMA1 is available at Aetrix Electronics and suitable for automotive ABS, ESC, and transmission speed sensing applications requiring stable component supply, AEC-Q100 Grade 0 qualification, and long-term lifecycle support.
Supply support for TLE4943CXAMA1 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 global R&D and manufacturing infrastructure.
The TLE4943CXAMA1 belongs to Infineon's TLE49xx family of Hall-effect wheel speed sensors, engineered specifically for functional safety-critical automotive motion sensing where direction awareness and diagnostic richness are mandatory.
FAQ
What is the AK protocol, and how does it differ from standard current-loop interfaces?
The AK protocol is a proprietary three-level current modulation scheme (IL/IM/IH) used exclusively by Infineon's TLE4943 series. Unlike simple on/off current loops, it encodes speed pulses, rotation direction, and air gap status within Manchester-coded frames - enabling full diagnostic capability over a single wire without additional communication lines or microcontroller overhead.
Does the TLE4943CXAMA1 require an external magnet for ferromagnetic targets?
Yes - a back-bias permanent magnet is required when used with ferromagnetic toothed wheels to generate the alternating field gradient sensed by the three-Hall array. The magnet is typically mounted behind the sensor PCB and must be positioned to ensure optimal field strength and gradient across the Hall elements' sensitive area.
How does the integrated 1.8 nF capacitor affect PCB layout and EMC testing?
The overmolded 1.8 nF capacitor is embedded directly into the PG-SSO-2-53 package mold compound, eliminating the need for an external ceramic capacitor. This removes layout sensitivity, reduces parasitic inductance, and improves conducted emissions performance - particularly in the 30–108 MHz band where automotive CISPR 25 Class 5 compliance is most challenging.
Can the TLE4943CXAMA1 operate reliably at air gaps exceeding 3.5 mm?
Yes - the datasheet specifies guaranteed operation up to 4.5 mm with standard M40 ferromagnetic gears and proper magnet biasing. Performance validation at extended air gaps requires verification of signal-to-noise ratio and edge jitter under worst-case temperature and vibration conditions, but the device's high sensitivity and adaptive thresholding maintain functional integrity within this range.
TLE4943CXAMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- TLE
- Package/Case:
- -
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Function:
- Special Purpose
- Technology:
- Hall Effect
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TLE4943CXAMA1 FAQ
1.How can I place an order for TLE4943CXAMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLE4943CXAMA1 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 TLE4943CXAMA1 reliable?
The price and inventory of TLE4943CXAMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLE4943CXAMA1 is usually 5 days.
3.What payment methods are accepted for TLE4943CXAMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLE4943CXAMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLE4943CXAMA1?
TLE4943CXAMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLE4943CXAMA1 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 TLE4943CXAMA1?
For technical support, including TLE4943CXAMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLE4943CXAMA1 requirements.
6.How does Aetrix verify that TLE4943CXAMA1 is sourced from the original manufacturer or authorized distributors?
All TLE4943CXAMA1 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 TLE4943CXAMA1 meets industry standards.
7.What is the process for return or replacement of TLE4943CXAMA1?
All TLE4943CXAMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TLE4943CXAMA1, 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 TLE4943CXAMA1 part is unused and in its original packaging.
Return procedure for TLE4943CXAMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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