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Allegro MicroSystems A31004KLHALX-RP3-0TC
- Part No.:
- A31004KLHALX-RP3-0TC
- Manufacturer:
- Allegro MicroSystems
- Category:
- Angle, Linear Position Measuring
- Package:
- SOT-23W
- Datasheet:
-
A31004KLHALX-RP3-0TC.pdf
- Description:
- UNIDIRECTIONAL LINEAR HALL-EFFEC
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
A31004KLHALX-RP3-0TC from Allegro MicroSystems is a unidirectional linear Hall-effect sensor IC with analog voltage output, designed for north-pole magnetic field detection in compact automotive and industrial position-sensing applications. It operates from 3.3 V supply, delivers 3.3 mV/G sensitivity, maintains 0.5 V quiescent output (QVO), and supports –40°C to +125°C ambient operation in a 3-pin SOT-23W (LH) package.
For engineers reviewing the A31004KLHALX-RP3-0TC datasheet, A31004KLHALX-RP3-0TC pinout, A31004KLHALX-RP3-0TC application, or A31004KLHALX-RP3-0TC equivalent, key selection criteria include its programmed 0%/°C typical sensitivity temperature coefficient at 125°C, ratiometric output behavior, integrated dynamic offset cancellation, and short-circuit diagnostic clamping capability.
Technical Context
The A31004KLHALX-RP3-0TC integrates a Hall element, BiCMOS signal chain, high-gain amplifier, and proprietary dynamic offset cancellation circuitry to suppress thermal and mechanical drift. Its chopping frequency is 400 kHz, enabling low-noise operation with 1.89 mG/√Hz input-referred RMS noise density and 20 kHz internal bandwidth.
This device implements ratiometric scaling of QVO, sensitivity, and output clamps relative to VCC, with ±1.5% ratiometry error across 3.0–3.63 V supply range. Undervoltage lockout (UVLO) activates at 3 V (power-on) and releases at 2.5 V (power-off), ensuring deterministic startup and shutdown behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.63 V: Ensures stable operation across automotive battery transients and industrial 3.3 V rail tolerances. |
| Sensitivity | 3.168–3.432 mV/G (typ. 3.3 mV/G): Enables precise analog magnetic field measurement with <±1.5% linearity error. |
| Quiescent Output (QVO) | 0.48–0.52 V at 25°C: Centered near half-supply for maximum bidirectional magnetic range under 3.3 V bias. |
| Sensitivity Tempco | –0.08 to +0.08 %/°C (at 125°C): Near-zero drift enables high-accuracy sensing without external compensation over full operating range. |
| Output Clamps | VCLPHIGH = 2.87–3.07 V, VCLPLOW = 0.25–0.43 V: Provide short-circuit diagnostics and limit magnetic saturation range. |
| Power-On Time | 50 µs max: Supports fast-response closed-loop control systems requiring sub-100 µs sensor latency. |
| Bandwidth | 20 kHz (–3 dB): Suitable for real-time angular/displacement tracking in motor commutation and valve position feedback. |
Pinout & Package
Package: LH - 3-pin SOT-23W surface-mount package, 2.0 mm × 3.0 mm × 1.0 mm, lead-free with 100% matte-tin plating, branded "AAC" for north-active orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive power supply input | Accepts 3.0–3.63 V; requires 0.1 µF bypass capacitor to GND for noise immunity and UVLO stability. |
| VOUT | Analog output signal terminal | Provides ratiometric voltage proportional to north-pole magnetic flux; clamped between 0.25–3.07 V for fault detection. |
| GND | Reference ground connection | Return path for supply current and output load; must be low-impedance to maintain accuracy and EMC performance. |
Key Features
| Feature | Design Value |
|---|---|
| Programmed Sensitivity Tempco | 0%/°C typical at 125°C: Eliminates need for external temperature compensation in high-stability position sensing. |
| Dynamic Offset Cancellation | 400 kHz chopping scheme: Reduces QVO drift to ±20 mV over –40°C to +125°C and ensures recoverability after thermal cycling. |
| Ratiometric Output | QVO, sensitivity, and clamps scale with VCC: Maintains measurement integrity during supply fluctuations common in automotive environments. |
| Integrated UVLO & Clamp Diagnostics | UVLO thresholds at 2.5 V / 3.0 V; output clamps at 0.34 V / 2.97 V: Enable robust system-level fault detection without external circuitry. |
| Low-Noise Analog Output | 6.6 mV(p-p) output noise, 1.89 mG/√Hz input noise density: Supports high-resolution displacement measurement down to sub-milligauss levels. |
Applications
| Throttle Position Sensing | Brake Pedal Angle Monitoring |
|---|---|
Use Scenario: Measures rotational angle of throttle body shaft via magnet mounted on rotating lever arm. IC Role / Device Role / Timing Role: Unidirectional linear Hall-effect sensor providing analog voltage output proportional to north-pole field strength. Use Value: Delivers ±1.5% linearity and 0%/°C sensitivity tempco to ensure consistent pedal-to-throttle mapping across –40°C to +125°C engine bay temperatures. |
Use Scenario: Detects linear displacement of brake pedal pushrod using magnet attached to moving rod and stationary sensor. IC Role / Device Role / Timing Role: North-active analog Hall sensor converting mechanical travel into calibrated voltage signal for ECU input. Use Value: Ratiometric output and integrated clamps enable direct ADC interfacing with built-in short-circuit diagnostics for functional safety compliance. |
| Electric Power Steering Torque Sensing | Industrial Linear Actuator Feedback |
Use Scenario: Mounted on torsion bar assembly to sense differential twist between input/output shafts in EPS column. IC Role / Device Role / Timing Role: High-bandwidth (20 kHz) linear Hall sensor capturing dynamic torque-induced magnetic field changes. Use Value: 50 µs power-on time and 400 kHz chopping support real-time torque estimation with minimal phase lag in closed-loop assist control. |
Use Scenario: Integrated into hydraulic or electromechanical actuator housing to monitor piston rod extension via embedded magnet. IC Role / Device Role / Timing Role: Compact SOT-23W Hall sensor delivering analog position feedback in space-constrained industrial enclosures. Use Value: 2 mm × 3 mm footprint and –40°C to +125°C rating allow direct PCB mounting in harsh factory environments without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional linear Hall-effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A31004LLHALX | South-active polarity; rated for –40°C to +150°C; 0.12%/°C sensitivity tempco (typ.) | Designed for higher-temperature engine compartment use (e.g., exhaust gas recirculation valves) | Select A31004LLHALX when south-pole detection or extended 150°C operation is required; not interchangeable due to polarity and tempco mismatch. |
| Melexis MLX90242ESE-GAA-000-RE | 3.3 V operation; 2.5 mV/G sensitivity; 0.05%/°C tempco; 4-pin SOIC package | Requires external bypass cap and lacks integrated UVLO; higher pin count increases PCB area | Choose MLX90242 for cost-sensitive industrial designs where 4-pin layout and slightly lower sensitivity are acceptable trade-offs. |
Compared with A31004LLHALX and MLX90242, the A31004KLHALX-RP3-0TC uniquely combines north-active polarity, 0%/°C tempco at 125°C, and 3-pin SOT-23W packaging-enabling drop-in replacement in existing north-pole throttle or brake pedal designs without layout change or calibration rework.
Availability
A31004KLHALX-RP3-0TC is available at Aetrix Electronics and suitable for automotive throttle position sensing, brake pedal monitoring, and industrial linear actuator feedback requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for A31004KLHALX-RP3-0TC 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
Allegro MicroSystems is a U.S.-based semiconductor company specializing in high-performance magnetic sensing and power ICs, with design centers in North America and manufacturing partnerships worldwide.
The A31004 product line targets high-accuracy, miniature-position feedback in automotive and industrial systems-specifically engineered to replace potentiometers and resolver-based solutions with solid-state reliability and extended temperature capability.
FAQ
What is the magnetic polarity sensitivity of the A31004KLHALX-RP3-0TC?
The A31004KLHALX-RP3-0TC is a north-active unidirectional linear Hall-effect sensor IC: it responds to magnetic fields oriented perpendicular to the branded face with north polarity, increasing VOUT from its quiescent value toward VCC. This polarity is confirmed by the "AAC" branding on the LH package and distinguishes it from the south-active A31004LLHALX variant.
Does the A31004KLHALX-RP3-0TC require an external bypass capacitor?
Yes, the A31004KLHALX-RP3-0TC requires a 0.1 µF ceramic bypass capacitor between VCC and GND, placed as close as possible to the device pins. This capacitor stabilizes the internal regulator, ensures proper UVLO operation, and minimizes noise coupling into the analog signal path per the manufacturer's validated operating conditions.
What is the significance of the "0TC" suffix in A31004KLHALX-RP3-0TC?
The "0TC" suffix denotes that the A31004KLHALX-RP3-0TC has been factory-programmed with a near-zero sensitivity temperature coefficient-specifically –0.08 to +0.08 %/°C (typ. 0%/°C) when tested at 125°C relative to 25°C. This programming occurs during Allegro's end-of-line test and is stored in non-volatile memory to sustain accuracy across the full –40°C to +125°C operating range.
Can the A31004KLHALX-RP3-0TC be used in AEC-Q100 qualified automotive systems?
While the A31004KLHALX-RP3-0TC is designed for automotive-grade operation (–40°C to +125°C, UVLO, EMC-hardened), its qualification status must be verified against the latest Allegro MicroSystems AEC-Q100 documentation. The device shares architecture and process with AEC-Q100-qualified variants like A31004LLHALX, but formal qualification for this specific part number requires checking Allegro's official compliance reports.
How does the dynamic offset cancellation in the A31004KLHALX-RP3-0TC improve measurement stability?
The A31004KLHALX-RP3-0TC uses a 400 kHz chopping scheme to modulate the Hall signal and separate DC offset from magnetic-field-induced voltage in the frequency domain. This technique reduces QVO drift to ±20 mV over temperature and ensures precise recoverability after thermal cycling-critical for applications like brake pedal sensing where zero-point repeatability directly impacts functional safety.
A31004KLHALX-RP3-0TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- SOT-23W
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- For Measuring:
- Linear Position
- Technology:
- Hall Effect
- Rotation Angle - Electrical, Mechanical:
- -
- Linear Range:
- -
- Output:
- Analog Voltage
- Output Signal:
- Clockwise Increase
- Actuator Type:
- External Magnet, Not Included
- Linearity:
- ±1.5%
- Resistance:
- -
- Resistance Tolerance:
- -
- Voltage - Supply:
- 3V ~ 3.63V
- Mounting Type:
- Surface Mount
- Termination Style:
- SMD (SMT) Tab
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23W
A31004KLHALX-RP3-0TC FAQ
1.How can I place an order for A31004KLHALX-RP3-0TC through Aetrix?
Please submit a Request for Quotation (RFQ) for A31004KLHALX-RP3-0TC 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 A31004KLHALX-RP3-0TC reliable?
The price and inventory of A31004KLHALX-RP3-0TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A31004KLHALX-RP3-0TC is usually 5 days.
3.What payment methods are accepted for A31004KLHALX-RP3-0TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A31004KLHALX-RP3-0TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A31004KLHALX-RP3-0TC?
A31004KLHALX-RP3-0TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A31004KLHALX-RP3-0TC 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 A31004KLHALX-RP3-0TC?
For technical support, including A31004KLHALX-RP3-0TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A31004KLHALX-RP3-0TC requirements.
6.How does Aetrix verify that A31004KLHALX-RP3-0TC is sourced from the original manufacturer or authorized distributors?
All A31004KLHALX-RP3-0TC 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 A31004KLHALX-RP3-0TC meets industry standards.
7.What is the process for return or replacement of A31004KLHALX-RP3-0TC?
All A31004KLHALX-RP3-0TC units undergo pre-shipment inspection (PSI). If there is an issue with A31004KLHALX-RP3-0TC, 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 A31004KLHALX-RP3-0TC part is unused and in its original packaging.
Return procedure for A31004KLHALX-RP3-0TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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