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Allegro MicroSystems A1318LLHLX-1-T
- Part No.:
- A1318LLHLX-1-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1318LLHLX-1-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
A1318LLHLX-1-T from Allegro MicroSystems is a linear Hall-effect sensor IC with analog output, designed for high-accuracy displacement and angular position sensing in automotive and industrial systems. It delivers 1.35 mV/G sensitivity, ratiometric 1.65 V quiescent output at 3.3 V supply, and operates across –40°C to 150°C. Its SOT-23W package enables compact surface-mount integration in motor control, throttle position, and brake pedal sensing.
For engineers reviewing the A1318LLHLX-1-T datasheet, A1318LLHLX-1-T pinout, A1318LLHLX-1-T application, or A1318LLHLX-1-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The A1318LLHLX-1-T integrates a BiCMOS monolithic circuit featuring a Hall element, dynamic offset cancellation, temperature-compensated sensitivity and QVO programming, and a high-speed 400 kHz chopping scheme. Its architecture eliminates thermal drift via end-of-line calibration of both sensitivity temperature coefficient (0.12%/°C typ) and QVO drift (±5 mV max over –40°C to 150°C).
It implements ratiometric operation: output voltage, sensitivity, and clamp levels scale linearly with VCC. The device includes undervoltage lockout (UVLO), output voltage clamps (2.97 V high / 0.33 V low at 3.3 V), and short-circuit diagnostic capability enabled by those clamps - all while maintaining 20 kHz bandwidth and 13 mVp-p output noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 1.35 mV/G typ - defines magnetic field resolution; enables ±370 G full-scale linear range with 3.3 V supply and 1.65 V QVO. |
| Quiescent Output (QVO) | 1.65 V typ at 3.3 V supply - centered at 50% of VCC for maximum symmetric swing; drift ≤ ±5 mV over full temperature range. |
| Supply Voltage | 3.3 V nominal (3.0–3.63 V) - optimized for low-power 3.3 V systems; includes UVLO with 2.5 V turn-off and 3.0 V turn-on thresholds. |
| Operating Temperature | –40°C to 150°C - qualified for under-hood automotive and industrial environments; junction limit 165°C. |
| Bandwidth | 20 kHz (–3 dB) - supports fast-response applications like motor commutation feedback and active suspension control. |
| Output Noise | 13 mVp-p - low-noise analog output suitable for precision position measurement without external filtering. |
| Package | SOT-23W (LH suffix) - 2 mm × 3 mm × 1 mm surface-mount footprint; thermally enhanced for PCBs with 2-layer copper. |
Pinout & Package
Package: 3-pin SOT-23W (LH), miniature low-profile surface-mount package, lead-free with 100% matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power input | 3.3 V supply pin; requires 0.1 µF bypass capacitor to GND; includes internal zener clamp (7.3 V max) and UVLO circuitry. |
| VOUT | Analog output | Ratiometric voltage output proportional to magnetic flux; clamped at 2.97 V (high) and 0.33 V (low); drives ≥4.7 kΩ load. |
| GND | Ground reference | Return path for supply and output; must be connected directly to system ground plane to maintain EMC performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| End-of-line QVO & sensitivity optimization | Each unit individually calibrated for 1.65 V QVO and 1.35 mV/G sensitivity, ensuring tight initial accuracy without system-level trimming. |
| Programmed sensitivity temperature coefficient | 0.12%/°C typ - reduces sensitivity drift over temperature, enabling stable gain across –40°C to 150°C without external compensation. |
| Chopping-based dynamic offset cancellation | 400 kHz chopping frequency eliminates thermal and mechanical stress-induced offset drift, delivering precise recoverability after temperature cycling. |
| Output voltage clamps | Clamp at 2.97 V / 0.33 V (at 3.3 V) - provides inherent short-circuit detection and prevents saturation during over-field conditions. |
| Ratiometric architecture | All key parameters (QVO, sensitivity, clamps) scale with VCC - simplifies system design when supply varies, eliminating need for separate voltage references. |
Applications
| Throttle Position Sensing | Brake Pedal Position Sensing |
|---|---|
Use Scenario: Non-contact measurement of accelerator pedal angle in gasoline and hybrid powertrains. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnetic field from rotating magnet on throttle shaft. Use Value: Delivers ±1.5% linearity error and <±5 mV QVO drift over –40°C to 150°C, meeting ASIL-B functional safety requirements for accurate torque demand mapping. |
Use Scenario: Redundant pedal travel monitoring in electronic braking systems (EBS) and brake-by-wire platforms. IC Role / Device Role / Timing Role: Primary analog position sensor detecting magnet displacement along brake pushrod axis. Use Value: Ratiometric output and UVLO ensure valid signal only within safe supply range; output clamps enable diagnostics during open/short faults. |
| Motor Commutation Feedback | Industrial Valve Position Monitoring |
Use Scenario: Six-step commutation timing in BLDC motors for HVAC blowers, power tools, and pumps. IC Role / Device Role / Timing Role: High-bandwidth (20 kHz) analog sensor feeding into MCU ADC for real-time rotor position estimation. Use Value: 50 µs power-on time and 20 kHz bandwidth support rapid motor startup and closed-loop speed control without latency-induced instability. |
Use Scenario: Continuous linear position feedback for pneumatic/hydraulic actuator stems in process automation and factory machinery. IC Role / Device Role / Timing Role: Robust analog sensor mounted near actuator magnet, immune to vibration and EMI in harsh industrial settings. Use Value: Immunity to mechanical stress and enhanced EMC performance ensure stable output in electrically noisy environments with minimal shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall-effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1315LLHLX-1-T | Same 1.35 mV/G sensitivity and SOT-23W package, but lacks programmable QVO temperature coefficient and has higher QVO drift (±15 mV vs. ±5 mV). | Lower accuracy over temperature; suitable for cost-sensitive non-automotive applications where full –40°C to 150°C stability is not required. | Select A1315LLHLX-1-T only if system-level calibration compensates for greater thermal drift and long-term stability is less critical. |
| ACS724LLCTR-10AU-T | Current sensor (not field sensor); measures current via integrated conductor; 10 A range; 1.35 mV/A output; same SOT-23W package. | Measures conductor current instead of magnetic field - incompatible for position/displacement use; applicable only where current sensing replaces field sensing. | Choose ACS724LLCTR-10AU-T only when the target signal is current through a trace or wire, not magnetic flux from a moving magnet. |
Compared with A1318LLHLX-1-T, A1315LLHLX-1-T offers lower cost but sacrifices thermal stability and calibrated QVO; ACS724LLCTR-10AU-T serves a fundamentally different measurement domain (current vs. field), requiring redesign of magnetic coupling and mechanical mounting.
Availability
A1318LLHLX-1-T is available at Aetrix Electronics and suitable for automotive throttle control, industrial valve positioning, and motor commutation feedback requiring stable component supply despite its Not for New Design status.
Supply support for A1318LLHLX-1-T 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 designer and manufacturer of high-performance magnetic sensors and power ICs, founded in 1989 and headquartered in Manchester, NH.
The A1318 family was developed specifically for high-accuracy, miniature linear Hall-effect sensing in automotive and industrial motion control, emphasizing temperature stability, ratiometric precision, and robustness in harsh environments.
FAQ
What is the operating supply voltage range for the A1318LLHLX-1-T?
The A1318LLHLX-1-T operates from 3.0 V to 3.63 V, with a nominal supply of 3.3 V. It features undervoltage lockout (UVLO) that disables output below 2.5 V and re-enables it above 3.0 V. This ensures clean startup and shutdown behavior in automotive and industrial power domains where supply rails may fluctuate.
Is the A1318LLHLX-1-T pin-compatible with other A1318 variants?
Yes, all A1318 variants with the LH (SOT-23W) package - including A1318LLHLX-1-T, A1318LLHLX-2-T, and A1318LLHLT-1-T - share identical pinout (VCC, VOUT, GND) and footprint. However, sensitivity (1.35 mV/G vs. 2.5 mV/G) and packing differ, so electrical behavior and reel quantity must be verified per design.
What does "Not for New Design" mean for the A1318LLHLX-1-T?
"Not for New Design" indicates A1318LLHLX-1-T is restricted to existing customer programs already using the part. Allegro no longer recommends it for new designs due to planned obsolescence; samples are unavailable. A1315LLHLX-1-T is the recommended transition path for new applications requiring similar performance.
How does the A1318LLHLX-1-T achieve stable quiescent output over temperature?
The A1318LLHLX-1-T achieves stable quiescent output (≤ ±5 mV drift from –40°C to 150°C) through end-of-line programming of both QVO and its temperature coefficient, combined with a high-speed chopping architecture that cancels thermal and mechanical offset drift. This eliminates need for external compensation circuits.
Can the A1318LLHLX-1-T be used in safety-critical automotive systems?
The A1318LLHLX-1-T supports ASIL-B functional safety requirements through its ratiometric architecture, output clamps for fault detection, UVLO, and proven thermal stability. However, final safety compliance depends on system-level implementation - designers must perform FMEDA and integrate A1318LLHLX-1-T per ISO 26262 guidelines for their specific architecture.
A1318LLHLX-1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- SOT-23W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 3V ~ 3.63V
- Current - Supply (Max):
- 10mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1318LLHLX-1-T FAQ
1.How can I place an order for A1318LLHLX-1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1318LLHLX-1-T 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 A1318LLHLX-1-T reliable?
The price and inventory of A1318LLHLX-1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1318LLHLX-1-T is usually 5 days.
3.What payment methods are accepted for A1318LLHLX-1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1318LLHLX-1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1318LLHLX-1-T?
A1318LLHLX-1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1318LLHLX-1-T 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 A1318LLHLX-1-T?
For technical support, including A1318LLHLX-1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1318LLHLX-1-T requirements.
6.How does Aetrix verify that A1318LLHLX-1-T is sourced from the original manufacturer or authorized distributors?
All A1318LLHLX-1-T 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 A1318LLHLX-1-T meets industry standards.
7.What is the process for return or replacement of A1318LLHLX-1-T?
All A1318LLHLX-1-T units undergo pre-shipment inspection (PSI). If there is an issue with A1318LLHLX-1-T, 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 A1318LLHLX-1-T part is unused and in its original packaging.
Return procedure for A1318LLHLX-1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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