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Home > Products > Sensors, Transducers > Magnetic Sensors > Linear, Compass (ICs)

Allegro MicroSystems A1322ELHLT

Name: A1322ELHLT
Brand: Allegro MicroSystems
SKU: A1322ELHLT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A1322ELHLT

Manufacturer:: Allegro MicroSystems

Category:: Linear, Compass (ICs)

Package:: SOT-23W

Datasheet:: A1322ELHLT.pdf

Description:: SENSOR HALL EFFECT ANALOG SOT23W

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Product details

Overview

A1322ELHLT from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature automotive and industrial position sensing. It delivers 3.125 mV/G sensitivity, rail-to-rail output, and stable 2.5 V quiescent voltage at 5 V supply across –40°C to +150°C ambient. Its BiCMOS monolithic design integrates Hall element, dynamic offset cancellation, and temperature-compensated amplifier for precise analog magnetic field measurement in harsh environments.

For engineers reviewing the A1322ELHLT datasheet, A1322ELHLT pinout, A1322ELHLT application, or A1322ELHLT equivalent, key selection criteria include its LH-package SOT-23W footprint, 30 kHz bandwidth, ±1.5% linearity, 25 mV peak-to-peak noise, and compatibility with 4.5–5.5 V supplies in demanding thermal cycling applications.

Technical Context

The A1322ELHLT employs a proprietary high-frequency (150 kHz) dynamic offset cancellation technique that samples the Hall element to suppress residual offset caused by overmolding stress and temperature gradients. This architecture enables precise recoverability after thermal cycling and immunity to mechanical stress without external calibration.

Its BiCMOS monolithic circuit integrates the Hall element, gain/offset trim circuitry, and rail-to-rail low-impedance output stage on a single die. The ratiometric design ensures both quiescent output voltage and sensitivity scale linearly with supply voltage, maintaining accuracy across 4.5–5.5 V operation while delivering 3.125 mV/G typical sensitivity at 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Sensitivity	3.125 mV/G typical - defines output voltage change per gauss of applied magnetic field, enabling precise analog position resolution
Quiescent Output Voltage	2.5 V at 5 V supply - rail-midpoint reference stabilizes zero-field baseline across temperature and supply variation
Operating Temperature	–40°C to +150°C - supports under-hood automotive and industrial motor control environments
Output Bandwidth	30 kHz - enables real-time response to rapidly changing magnetic fields in rotary or linear motion systems
Noise (Peak-to-Peak)	25 mV - limits minimum detectable field change in low-signal applications without external filtering
Supply Voltage Range	4.5–5.5 V - tight regulation requirement ensures ratiometric accuracy and avoids Zener clamp activation
Output Impedance	1.5 Ω typical - low source impedance drives 4.7 kΩ minimum load without signal degradation

Pinout & Package

Package: 3-pin SOT-23W (LH suffix), surface-mount, lead-free with 100% matte tin plating. Dimensions: 2.98 × 1.49 × 1.00 mm (L×W×H), branded face orientation critical for magnetic field polarity alignment.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	Connects to regulated 4.5–5.5 V rail; internal Zener clamp activates above 8 V to prevent damage
VOUT	Analog output	Rail-to-rail voltage output proportional to magnetic flux density; requires ≤10 nF load capacitance
GND	Ground reference	Common return path for supply and output; must be low-impedance to minimize noise coupling

Key Features

Feature	Design Value
Dynamic offset cancellation	150 kHz internal clock eliminates thermal and mechanical drift, enabling ±10 G equivalent accuracy over temperature
Ratiometric output	Both V_OUT(Q) and sensitivity track V_CC within ±1.5%, removing need for precision voltage references
High-temperature stability	ΔSens(T_Amax) limited to ±5% for LH package - maintains calibration integrity at 150°C ambient
Robust EMC protection	Integrated filtering and BiCMOS layout reduce susceptibility to radiated and conducted interference in noisy motor environments
End-of-line trimming	Laser-trimmed gain and offset at final test ensure 3.125 mV/G sensitivity and 2.5 V quiescent voltage without user calibration

Applications

Automotive Throttle Position Sensing	Industrial Motor Commutation
Use Scenario: Monitoring angular position of throttle plate in gasoline engine intake manifold under hood temperatures up to 150°C. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet rotation, interfaced directly to ECU ADC. Use Value: Stable 3.125 mV/G sensitivity and ±1.5% linearity ensure <±0.5° position error across full temperature range without recalibration.	Use Scenario: Detecting rotor position in brushless DC motors for closed-loop commutation in factory automation drives. IC Role / Device Role / Timing Role: Analog magnetic field transducer feeding real-time position data to motor controller's timing logic. Use Value: 30 kHz bandwidth and rail-to-rail output enable accurate phase alignment at 10,000 RPM, reducing torque ripple by >15% versus lower-bandwidth sensors.
Heavy-Duty Gear Position Detection	Hydraulic Valve Stroke Monitoring
Use Scenario: Measuring gear engagement state in off-highway vehicle transmissions exposed to vibration and thermal shock. IC Role / Device Role / Timing Role: High-reliability Hall sensor mounted adjacent to ferrous gear tooth, converting proximity into analog voltage. Use Value: Immunity to mechanical stress and ±2% sensitivity drift after temperature cycling ensure consistent detection over 10,000+ shift cycles.	Use Scenario: Tracking linear displacement of hydraulic spool valve in construction equipment control valves operating at 120°C oil temperature. IC Role / Device Role / Timing Role: Contactless linear position sensor replacing potentiometers in sealed hydraulic manifolds. Use Value: Solid-state reliability and 25 mV peak-to-peak noise allow sub-millimeter stroke resolution without external amplification or filtering.

Automotive Throttle Position Sensing

Industrial Motor Commutation

Use Scenario: Monitoring angular position of throttle plate in gasoline engine intake manifold under hood temperatures up to 150°C.

IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet rotation, interfaced directly to ECU ADC.

Use Value: Stable 3.125 mV/G sensitivity and ±1.5% linearity ensure <±0.5° position error across full temperature range without recalibration.

Use Scenario: Detecting rotor position in brushless DC motors for closed-loop commutation in factory automation drives.

IC Role / Device Role / Timing Role: Analog magnetic field transducer feeding real-time position data to motor controller's timing logic.

Use Value: 30 kHz bandwidth and rail-to-rail output enable accurate phase alignment at 10,000 RPM, reducing torque ripple by >15% versus lower-bandwidth sensors.

Heavy-Duty Gear Position Detection

Hydraulic Valve Stroke Monitoring

Use Scenario: Measuring gear engagement state in off-highway vehicle transmissions exposed to vibration and thermal shock.

IC Role / Device Role / Timing Role: High-reliability Hall sensor mounted adjacent to ferrous gear tooth, converting proximity into analog voltage.

Use Value: Immunity to mechanical stress and ±2% sensitivity drift after temperature cycling ensure consistent detection over 10,000+ shift cycles.

Use Scenario: Tracking linear displacement of hydraulic spool valve in construction equipment control valves operating at 120°C oil temperature.

IC Role / Device Role / Timing Role: Contactless linear position sensor replacing potentiometers in sealed hydraulic manifolds.

Use Value: Solid-state reliability and 25 mV peak-to-peak noise allow sub-millimeter stroke resolution without external amplification or filtering.

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
A1325LLHLX-T	Same LH package, 3.125 mV/G sensitivity, but rated for extended life cycle and updated manufacturing process	Designed for new designs requiring long-term supply continuity; replaces A1322LLHLT-T per Allegro's obsolescence notice	Select when sourcing for production programs beyond Q3 2025 due to A1322ELHLT discontinuation status
ACS724LLCTR-30AU-T	Current sensor (not field sensor), 30 A range, integrated conductor, different measurement principle and output scaling	Used where current monitoring is required instead of magnetic field or position sensing	Only consider if application measures conductor current rather than external magnetic flux density

Compared with A1322ELHLT, A1325LLHLX-T offers identical sensitivity and package but improved lifecycle support, while ACS724LLCTR-30AU-T serves fundamentally different current-sensing use cases and cannot substitute for position or field measurement.

Availability

A1322ELHLT is available at Aetrix Electronics and suitable for automotive throttle sensing, industrial motor commutation, and hydraulic valve monitoring requiring stable component supply despite its discontinued status.

Supply support for A1322ELHLT 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 A132X family was designed specifically for high-temperature linear and rotary position sensing in harsh environments, emphasizing thermal stability, mechanical robustness, and ratiometric accuracy without external compensation.

FAQ

What is the operating temperature range for the A1322ELHLT?

The A1322ELHLT operates from –40°C to +150°C ambient temperature. This wide range is enabled by its BiCMOS monolithic construction, internal temperature-compensating circuitry, and dynamic offset cancellation architecture. The device maintains specified sensitivity and quiescent output voltage across this full range, making it suitable for under-hood automotive and industrial motor applications where thermal cycling is severe. A1322ELHLT's performance is validated per the Absolute Maximum Ratings table and DEVICE CHARACTERISTICS section of its datasheet.

Is the A1322ELHLT still in production?

No, the A1322ELHLT is a discontinued product and should not be purchased for new design applications. Allegro MicroSystems declared it Pre-End of Life as of January 31, 2011, with final order availability subject to Last Time Buy terms. While Aetrix Electronics maintains legacy inventory for existing programs, no new production runs are scheduled. For new designs, Allegro recommends A1325LLHLX-T as the designated replacement. A1322ELHLT remains supported for repair and maintenance of deployed systems.

What is the pin configuration and package type of the A1322ELHLT?

The A1322ELHLT uses a 3-pin SOT-23W (LH) surface-mount package with pin 1 = VCC, pin 2 = VOUT, and pin 3 = GND. The branded face must face the magnetic source for correct polarity response. Package dimensions are 2.98 mm × 1.49 mm × 1.00 mm, with 100% matte tin plating and RoHS compliance. This LH footprint differs from the SIP (UA) variant and is not interchangeable without PCB redesign. A1322ELHLT's pinout is confirmed in the Terminal List and Pin-out Drawings sections of the official datasheet.

How does the ratiometric feature benefit A1322ELHLT system design?

The A1322ELHLT's ratiometric output means both its quiescent voltage and sensitivity scale linearly with supply voltage, with ±1.5% ratiometry error over 4.5–5.5 V. This eliminates the need for a precision voltage reference in the signal chain, simplifies ADC interface design, and improves overall system accuracy when the same supply powers both A1322ELHLT and the microcontroller's ADC reference. It also reduces sensitivity to power rail noise and regulation tolerance, making A1322ELHLT robust in electrically noisy automotive and industrial environments.

What is the output noise specification for the A1322ELHLT?

The A1322ELHLT has a peak-to-peak output noise of 25 mV when measured with a 0.1 μF bypass capacitor and no load, per the DEVICE CHARACTERISTICS table. This noise level includes contributions from both analog and digital circuitry and sets the practical limit for minimum detectable magnetic field change. For high-resolution applications, designers may add external RC filtering at the output, but must respect the 10 nF maximum load capacitance limit to avoid instability. A1322ELHLT's noise performance is verified across temperature and supply voltage variations in the Typical Characteristics section.

A1322ELHLT Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: SOT-23W

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Hall Effect

Axis:: Single

Output Type:: Analog Voltage

Sensing Range:: -

Voltage - Supply:: 4.5V ~ 5.5V

Current - Supply (Max):: 8mA

Current - Output (Max):: 10mA

Resolution:: -

Bandwidth:: 30kHz

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Features:: Temperature Compensated

Supplier Device Package:: SOT-23W

Mounting Type:: Surface Mount

A1322ELHLT FAQ

1.How can I place an order for A1322ELHLT through Aetrix?

Please submit a Request for Quotation (RFQ) for A1322ELHLT 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 A1322ELHLT reliable?

The price and inventory of A1322ELHLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1322ELHLT is usually 5 days.

3.What payment methods are accepted for A1322ELHLT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1322ELHLT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1322ELHLT?

A1322ELHLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1322ELHLT 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 A1322ELHLT?

For technical support, including A1322ELHLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1322ELHLT requirements.

6.How does Aetrix verify that A1322ELHLT is sourced from the original manufacturer or authorized distributors?

All A1322ELHLT 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 A1322ELHLT meets industry standards.

7.What is the process for return or replacement of A1322ELHLT?

All A1322ELHLT units undergo pre-shipment inspection (PSI). If there is an issue with A1322ELHLT, 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 A1322ELHLT part is unused and in its original packaging.

Return procedure for A1322ELHLT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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