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Allegro MicroSystems ALS31000LLHALX
- Part No.:
- ALS31000LLHALX
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
ALS31000LLHALX.pdf
- Description:
- SENSOR HALL EFFECT SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:3,480
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Product details
Overview
ALS31000LLHALX from Allegro MicroSystems is a unidirectional linear Hall-effect sensor IC in a 3-pin SOT-23W package, delivering ratiometric analog voltage output proportional to applied magnetic field strength. It features 2.4 mV/G sensitivity, 0.7 V quiescent output (QVO), ±1.5% linearity error, and operates across –40°C to 150°C for high-accuracy angular/displacement sensing in automotive throttle and industrial valve position systems.
For engineers reviewing the ALS31000LLHALX datasheet, ALS31000LLHALX pinout, ALS31000LLHALX application, or ALS31000LLHALX equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The ALS31000LLHALX integrates a BiCMOS monolithic circuit with dynamic offset cancellation, temperature-compensated sensitivity and QVO programming, and a proprietary high-speed chopping scheme operating at 400 kHz. Its architecture eliminates thermal drift-induced offset while maintaining 20 kHz small-signal bandwidth and <1 Ω DC output resistance.
It implements ratiometric operation: QVO, sensitivity, and output clamps scale linearly with VCC (4.5–5.5 V), enabling stable performance under supply variation. Undervoltage lockout (UVLO) ensures valid output only within 2.5–3.0 V hysteresis window, and output voltage clamps (0.37–0.65 V low, 4.35–4.65 V high) provide short-circuit diagnostics without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.4 mV/G typical - defines output voltage change per gauss of perpendicular south-pole field; enables precise field-to-voltage translation in closed-loop feedback systems. |
| Quiescent Voltage Output (QVO) | 0.7 V typical at 25°C - stable reference point for zero-field condition; programmed end-of-line for application-specific accuracy. |
| Operating Temperature Range | –40°C to 150°C - supports under-hood automotive and industrial motor control environments without derating. |
| Supply Voltage | 4.5–5.5 V - ratiometric behavior ensures output scaling with supply; UVLO prevents invalid output below 2.5 V. |
| Internal Bandwidth | 20 kHz - supports fast magnetic field changes in servo actuation and real-time position tracking. |
| Output Clamp Voltages | VCLPHIGH = 4.5 V, VCLPLOW = 0.51 V - limit linear range and enable fault detection via output saturation during short-circuit events. |
| Linearity Error | ±1.5% - quantifies deviation from ideal linear response over full magnetic range; critical for high-fidelity position reconstruction. |
Pinout & Package
ALS31000LLHALX uses the LH package: miniature 3-pin SOT-23W surface-mount package (2.0 × 3.0 × 1.0 mm), lead-free with 100% matte-tin plating, optimized for space-constrained PCB layouts in automotive and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 4.5–5.5 V; requires 0.1 µF bypass capacitor to GND; powers internal regulator, amplifier, and logic blocks. |
| VOUT | Analog output signal | Low-impedance ratiometric voltage output (0.7 V QVO, 2.4 mV/G); clamped to protect against short circuits; drives up to 10 nF load capacitance. |
| GND | Ground reference | Common return path for supply and output; must be low-impedance to minimize noise coupling into Hall element and amplifier stages. |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line QVO and sensitivity optimization | Enables application-specific calibration at Allegro test; sustains accuracy across –40°C to 150°C by programming TCSENS and TCVOUT(Q) at 150°C. |
| High-speed chopping (400 kHz) | Reduces QVO drift to ±10 mV over temperature; eliminates thermal and mechanical stress-induced offset without external compensation. |
| Ratiometric output architecture | Ensures QVO, sensitivity, and clamp voltages scale linearly with VCC; maintains measurement integrity despite supply ripple or tolerance variations. |
| Integrated output clamps | Provides built-in short-circuit diagnostic: VOUT saturates at 0.51 V (low) or 4.5 V (high) when load faults occur-no external protection needed. |
| Undervoltage lockout (UVLO) | Guarantees clean power-up/power-down sequencing: output held low until VCC ≥ 3.0 V, remains valid down to 2.5 V, preventing metastable states. |
Applications
| Automotive Throttle Position Sensing | Industrial Linear Actuator Feedback |
|---|---|
Use Scenario: Monitoring rotational angle of electronic throttle body in ICE and hybrid powertrains. IC Role / Device Role / Timing Role: Unidirectional linear Hall-effect sensor providing analog voltage proportional to throttle plate angle. Use Value: ±1.5% linearity and –40°C to 150°C operation ensure accurate air-fuel ratio control under extreme under-hood conditions. |
Use Scenario: Closed-loop position feedback for hydraulic or electric linear actuators in factory automation. IC Role / Device Role / Timing Role: Analog-output Hall sensor measuring displacement of piston rod via magnetic target movement. Use Value: 20 kHz bandwidth and 2.4 mV/G sensitivity enable real-time position correction at >100 Hz control loop rates. |
| Electric Power Steering (EPS) Motor Commutation | Rotary Encoder Supplement in Motor Drives |
Use Scenario: Supporting rotor position estimation in brushless DC motors used in EPS systems. IC Role / Device Role / Timing Role: Auxiliary unidirectional Hall sensor augmenting primary encoder for fault-tolerant commutation timing. Use Value: Ratiometric output and UVLO prevent erroneous switching commands during battery voltage sag or cold cranking. |
Use Scenario: Adding analog field-strength feedback to incremental rotary encoders in servo motor feedback loops. IC Role / Device Role / Timing Role: Linear Hall sensor detecting magnet position relative to encoder disk for absolute zero-reference calibration. Use Value: Precise recoverability after temperature cycling ensures consistent zero-point alignment across thermal cycles in CNC machinery. |
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 |
|---|---|---|---|
| Melexis MLX90393ELD-ABA-000-SP | Tri-axis digital I²C output; programmable gain and offset; no analog ratiometric output or integrated clamps. | Requires microcontroller interface and external fault handling; better suited for multi-axis orientation than single-axis position. | Select when digital bus integration and field vector resolution outweigh need for direct analog interfacing and self-diagnostic clamps. |
| Allegro A1308LLHLT-T | Legacy 3-pin SOT-23; fixed 2.5 mV/G sensitivity; no end-of-line QVO/sensitivity optimization or TC programming. | Lacks temperature coefficient tuning; exhibits higher QVO drift (±25 mV) and lower linearity (±2.0%) across temperature. | Choose only for cost-sensitive legacy designs where ±2.0% linearity and wider QVO drift are acceptable. |
Compared with ALS31000LLHALX, MLX90393 offers digital flexibility but adds system complexity and removes analog simplicity and built-in diagnostics; A1308LLHLT-T reduces cost but sacrifices temperature stability, linearity, and programmability required for next-gen automotive and industrial precision sensing.
Availability
ALS31000LLHALX is available at Aetrix Electronics and suitable for automotive throttle control, industrial linear actuator feedback, electric power steering motor commutation, and rotary encoder supplement applications requiring stable component supply, extended temperature reliability, and production-ready traceability.
Supply support for ALS31000LLHALX 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 for automotive and industrial markets.
The ALS31000LLHALX belongs to Allegro's high-accuracy linear Hall-effect sensor product line, designed specifically for displacement and angular position sensing in harsh environments demanding precision, stability, and compact packaging.
FAQ
What is the operating supply voltage range for ALS31000LLHALX?
The ALS31000LLHALX operates from 4.5 V to 5.5 V nominal supply voltage. Its ratiometric architecture ensures that QVO, sensitivity, and output clamps scale linearly with VCC. Undervoltage lockout (UVLO) holds the output low until VCC exceeds 3.0 V and maintains validity down to 2.5 V, preventing erratic behavior during brown-out conditions. This makes ALS31000LLHALX robust in automotive battery environments subject to cranking transients.
How does ALS31000LLHALX achieve high temperature stability?
The ALS31000LLHALX achieves high temperature stability through end-of-line programming of both sensitivity temperature coefficient (TCSens) and QVO temperature coefficient at Allegro's test facility. These coefficients are tuned at 150°C relative to 25°C baseline, enabling compensation across –40°C to 150°C. Combined with dynamic offset cancellation and 400 kHz chopping, this reduces QVO drift to ±10 mV and maintains ±1.5% linearity-critical for ALS31000LLHALX deployment in engine control units and industrial motor drives.
What is the function of the output voltage clamps in ALS31000LLHALX?
The ALS31000LLHALX features integrated output voltage clamps: VCLPHIGH ≈ 4.5 V and VCLPLOW ≈ 0.51 V (at VCC = 5 V). These clamps limit the linear output range and serve as self-diagnostic indicators-when VOUT saturates at either clamp due to excessive load current or short-to-rail faults, the system detects failure without external circuitry. Because clamps scale ratiometrically with VCC, ALS31000LLHALX retains diagnostic capability across its full 4.5–5.5 V supply range.
Can ALS31000LLHALX be used in bidirectional magnetic field sensing applications?
No, ALS31000LLHALX is explicitly a unidirectional linear Hall-effect sensor IC. Its analog output increases from QVO (0.7 V) toward VCC in response to a south-pole magnetic field perpendicular to the branded surface; it does not produce negative-going output for north-pole fields. For bidirectional sensing, Allegro offers alternatives like the ALS31300 series. Using ALS31000LLHALX in bidirectional configurations would result in clipped or non-linear response outside its specified unidirectional range.
What PCB layout considerations are critical for ALS31000LLHALX performance?
For optimal ALS31000LLHALX performance, place a 0.1 µF ceramic bypass capacitor between VCC and GND as close as possible to the device pins. Maintain low-impedance GND routing to minimize noise coupling into the Hall element and amplifier. Avoid routing noisy signals (e.g., switching regulators) near the sensor area or under the branded face. The active Hall region is centered beneath the marking "A30" on the top surface, at 0.28 ±0.04 mm depth-mechanical mounting must avoid stress on this zone to preserve ALS31000LLHALX's hysteresis-free accuracy.
ALS31000LLHALX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- SOT-23W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- -
- Sensing Range:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Resolution:
- -
- Bandwidth:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
ALS31000LLHALX FAQ
1.How can I place an order for ALS31000LLHALX through Aetrix?
Please submit a Request for Quotation (RFQ) for ALS31000LLHALX 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 ALS31000LLHALX reliable?
The price and inventory of ALS31000LLHALX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ALS31000LLHALX is usually 5 days.
3.What payment methods are accepted for ALS31000LLHALX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ALS31000LLHALX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ALS31000LLHALX?
ALS31000LLHALX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ALS31000LLHALX 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 ALS31000LLHALX?
For technical support, including ALS31000LLHALX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ALS31000LLHALX requirements.
6.How does Aetrix verify that ALS31000LLHALX is sourced from the original manufacturer or authorized distributors?
All ALS31000LLHALX 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 ALS31000LLHALX meets industry standards.
7.What is the process for return or replacement of ALS31000LLHALX?
All ALS31000LLHALX units undergo pre-shipment inspection (PSI). If there is an issue with ALS31000LLHALX, 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 ALS31000LLHALX part is unused and in its original packaging.
Return procedure for ALS31000LLHALX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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