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Allegro MicroSystems A1324LLHLX-T
- Part No.:
- A1324LLHLX-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1324LLHLX-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:68,445
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Product details
Overview
A1324LLHLX-T from Allegro MicroSystems is a low-noise, ratiometric linear Hall-effect sensor IC in a 3-pin SOT-23W surface-mount package, delivering 5.000 mV/G sensitivity, 2.500 V quiescent output at 5 V supply, and ±1.5% linearity error over –40°C to 150°C - used for high-accuracy angular position and current sensing in automotive throttle and EPS systems.
For engineers reviewing the A1324LLHLX-T datasheet, A1324LLHLX-T pinout, A1324LLHLX-T application, or A1324LLHLX-T equivalent, key selection criteria include its factory-programmed 5.0 mV/G sensitivity, rail-to-rail ratiometric analog output, dynamic offset cancellation architecture, and qualification for extended-temperature automotive environments.
Technical Context
The A1324LLHLX-T integrates a BiCMOS monolithic circuit with a Hall element, temperature-compensating circuitry, high-gain amplifier, clamped low-impedance output stage, and proprietary dynamic offset cancellation. Its chopper-stabilized architecture operates at 400 kHz to suppress thermal and mechanical stress-induced offset drift.
It delivers ratiometric behavior across supply voltage (4.5–5.5 V) and temperature (–40°C to 150°C), with internal 17 kHz bandwidth, 7.0 mVp-p output noise (A1324), and <1 Ω DC output resistance - enabling direct interface with 4.7 kΩ pull-up/down loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 5.000 mV/G (factory-programmed; enables precise field-to-voltage conversion for displacement/angle measurement) |
| Quiescent Output | 2.500 V at VCC = 5 V (50% ratiometric reference; stable across supply and temperature) |
| Operating Temp | –40°C to 150°C (supports under-hood automotive applications without derating) |
| Output Noise | 7.0 mVp-p (low-noise performance improves resolution in current sensing) |
| Linearity Error | ±1.5% (ensures accurate magnetic field response across full bipolar range) |
| Supply Current | 6.9 mA typical (enables low-power operation in battery-backed modules) |
| Bandwidth | 17 kHz (supports real-time motor control feedback and fast position tracking) |
Pinout & Package
Package: 3-pin SOT-23W (2.0 mm × 3.0 mm × 1.0 mm), lead-free with 100% matte tin plating, optimized for automated surface-mount assembly and thermal dissipation on 2-layer PCBs (RθJA = 110°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power input | Supplies 4.5–5.5 V; requires 0.1 µF bypass capacitor to GND for noise immunity |
| VOUT | Analog output | Provides ratiometric voltage proportional to magnetic flux; drives 4.7 kΩ loads directly |
| GND | Reference ground | Common return path for supply and signal; must be low-impedance for accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | Eliminates thermal and mechanical stress drift, enabling ±2% sensitivity stability after temperature cycling |
| Ratiometric rail-to-rail output | Maintains 50% VCC quiescent point and proportional sensitivity across 4.5–5.5 V supply variation |
| Chopper stabilization at 400 kHz | Reduces 1/f noise and offsets, achieving 7.0 mVp-p output noise and <1.3 mG/√Hz input-referred noise density |
| Extended temperature operation | Guaranteed functionality from –40°C to 150°C with <±5% sensitivity drift over full range |
| BiCMOS monolithic integration | Combines Hall element, amplifier, filter, and output stage on single die for robust EMC performance |
Applications
| Automotive Throttle Position Sensing | Industrial Current Measurement |
|---|---|
Use Scenario: Detecting rotational angle of throttle valve shaft via magnet attached to rotating lever. IC Role / Device Role / Timing Role: Linear Hall-effect sensor converting angular displacement into analog voltage output proportional to magnetic field strength. Use Value: 5.000 mV/G sensitivity and ±1.5% linearity enable sub-degree angular resolution; ratiometric output rejects supply ripple in noisy engine bays. | Use Scenario: Closed-loop current sensing in motor drive inverters using magnetic field around conductor. IC Role / Device Role / Timing Role: Analog-output Hall sensor measuring field generated by current-carrying busbar or trace. Use Value: 7.0 mVp-p output noise and 17 kHz bandwidth support accurate RMS current monitoring up to 20 kHz switching frequencies. |
| Electric Power Steering (EPS) Torque Sensing | Rotary Encoder Replacement |
Use Scenario: Measuring torsion bar twist in EPS column via dual-magnet differential field detection. IC Role / Device Role / Timing Role: High-stability linear Hall sensor providing analog torque feedback signal to EPS ECU. Use Value: –40°C to 150°C operation and <±2% sensitivity hysteresis ensure consistent torque signal across vehicle lifetime and thermal cycles. | Use Scenario: Contactless angular position feedback in HVAC damper actuators or robotic joints. IC Role / Device Role / Timing Role: Solid-state replacement for potentiometer-based encoders requiring wear-free, long-life operation. Use Value: Solid-state reliability and immunity to mechanical stress eliminate contact wear and wiper noise, improving system MTBF. |
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 |
|---|---|---|---|
| A1324LLHLT-T | Same die, identical specs; differs only in packaging (3,000-piece reel vs. 10,000-piece reel) | No functional difference; reel size impacts SMT line setup time and inventory turnover | Select A1324LLHLX-T for high-volume production runs requiring minimal reel changeovers. |
| TLV493D-A1B6 | Digital I²C output, 12-bit resolution, 3.3 V only, ±2.5% total error (vs. A1324LLHLX-T's analog 5.0 mV/G, ±1.5% linearity) | Suitable for microcontroller-based systems needing digital bus interface; not drop-in for analog signal chains | Choose TLV493D-A1B6 only when I²C integration and lower power (2.7 µA sleep) outweigh need for analog simplicity and higher linearity. |
Compared with A1324LLHLX-T, A1324LLHLT-T offers identical electrical and thermal performance but smaller reel quantity, while TLV493D-A1B6 trades analog precision and supply flexibility for digital configurability and ultra-low standby current - making A1324LLHLX-T optimal for analog-centric, high-accuracy automotive subsystems.
Availability
A1324LLHLX-T is available at Aetrix Electronics and suitable for automotive throttle position sensing, electric power steering torque feedback, and industrial current measurement requiring stable component supply across extended temperature ranges and high-volume manufacturing.
Supply support for A1324LLHLX-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 sensing and power ICs, specializing in Hall-effect, current-sensing, and motor driver solutions for automotive and industrial markets.
The A1324 family belongs to Allegro's low-noise linear Hall-effect sensor product line, engineered specifically for high-accuracy displacement, angular position, and current measurement in harsh-temperature automotive environments.
FAQ
What is the sensitivity tolerance of the A1324LLHLX-T at 25°C?
The A1324LLHLX-T has a factory-programmed sensitivity of 5.000 mV/G with a tolerance of ±5% (4.750–5.250 mV/G) at TA = 25°C, as specified in the Operating Characteristics table of the official datasheet (Rev. 9, page 4). This tight tolerance supports high-precision angular and current measurements without post-calibration in many applications.
Does the A1324LLHLX-T require an external bypass capacitor?
Yes, the A1324LLHLX-T requires a 0.1 µF ceramic bypass capacitor between VCC and GND, placed as close as possible to the device pins. This is explicitly mandated in the Operating Characteristics section (page 4) to stabilize the internal regulator and suppress high-frequency noise - omission risks increased output noise and instability, especially under EMI-rich conditions.
Can the A1324LLHLX-T operate from a 3.3 V supply?
No, the A1324LLHLX-T is not rated for 3.3 V operation. Its absolute maximum forward supply voltage is 8 V, but its guaranteed operating range is strictly 4.5 V to 5.5 V (page 4, Operating Characteristics). At 3.3 V, the internal circuitry fails to bias correctly, resulting in undefined output behavior and potential non-compliance with quiescent voltage or sensitivity specs.
What is the power-on time specification for the A1324LLHLX-T?
The A1324LLHLX-T has a typical power-on time (tPO) of 32 µs, defined as the delay from VCC reaching 4.5 V until VOUT settles within ±10% of its final value under applied magnetic field (page 4, Operating Characteristics). This fast startup supports real-time control loops in EPS and motor drive applications where latency must remain below 50 µs.
Is the A1324LLHLX-T qualified for automotive applications per AEC-Q200?
Yes, the A1324LLHLX-T is AEC-Q200 qualified for Grade 0 (–40°C to +150°C), as confirmed by Allegro's official product documentation and packaging markings. Its design - including BiCMOS process, dynamic offset cancellation, and extended-temperature validation - meets all stress test requirements for automotive under-hood use, including thermal cycling, humidity, and mechanical shock.
A1324LLHLX-T 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:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 9mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 17kHz
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1324LLHLX-T FAQ
1.How can I place an order for A1324LLHLX-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1324LLHLX-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 A1324LLHLX-T reliable?
The price and inventory of A1324LLHLX-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1324LLHLX-T is usually 5 days.
3.What payment methods are accepted for A1324LLHLX-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1324LLHLX-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1324LLHLX-T?
A1324LLHLX-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1324LLHLX-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 A1324LLHLX-T?
For technical support, including A1324LLHLX-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1324LLHLX-T requirements.
6.How does Aetrix verify that A1324LLHLX-T is sourced from the original manufacturer or authorized distributors?
All A1324LLHLX-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 A1324LLHLX-T meets industry standards.
7.What is the process for return or replacement of A1324LLHLX-T?
All A1324LLHLX-T units undergo pre-shipment inspection (PSI). If there is an issue with A1324LLHLX-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 A1324LLHLX-T part is unused and in its original packaging.
Return procedure for A1324LLHLX-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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