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Allegro MicroSystems A1322LLHLT-T
- Part No.:
- A1322LLHLT-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1322LLHLT-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:2,386
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Product details
Overview
A1322LLHLT-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature operation (–40 °C to +150 °C), delivering 3.125 mV/G sensitivity, rail-to-rail output, and quiescent output voltage at 50% of VCC. It integrates dynamic offset cancellation, BiCMOS signal conditioning, and temperature-compensated amplification for automotive throttle position, brake pedal, and industrial rotary sensing.
For engineers reviewing the A1322LLHLT-T datasheet, A1322LLHLT-T pinout, A1322LLHLT-T application, or A1322LLHLT-T equivalent, key selection criteria include its LH package (SOT-23W), ±1.5% linearity, 30 kHz bandwidth, and discontinuation status requiring legacy design support or migration planning.
Technical Context
The A1322LLHLT-T employs a proprietary high-frequency (150 kHz) dynamic offset cancellation technique that eliminates residual offset caused by overmolding, thermal stress, and temperature drift-enabling stable quiescent output voltage across –40 °C to +150 °C. Its monolithic BiCMOS architecture integrates Hall element, gain/offset trim circuitry, and rail-to-rail output stage on a single die.
This device operates ratiometrically: both quiescent output voltage (2.5 V ±75 mV at 5 V supply) and sensitivity (3.125 mV/G ±3.1%) scale linearly with VCC (4.5–5.5 V). Output noise is specified at 25 mVPP, and bandwidth is 30 kHz-supporting fast-response position feedback in engine control units and industrial actuators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 3.125 mV/G typical - enables precise analog magnetic field measurement with ±1.5% linearity over full temperature range |
| Operating Temperature | –40 °C to +150 °C - qualified for under-hood automotive and industrial environments without derating |
| Supply Voltage | 4.5–5.5 V - ratiometric operation ensures output scaling with supply; Zener clamp protects up to 8 V |
| Quiescent Output | 2.5 V ±75 mV at 5 V supply - stable 50% VCC reference simplifies ADC interfacing and fault detection |
| Output Bandwidth | 30 kHz - supports real-time position tracking in fast-moving mechanical systems (e.g., turbocharger vanes) |
| Noise (Peak-to-Peak) | 25 mV - low-noise performance enables high-resolution sensing without external filtering |
| Package | SOT-23W (LH suffix) - surface-mount 3-pin thermally enhanced package with 228 °C/W RθJA on 1-layer PCB |
Pinout & Package
Package: SOT-23W (3-pin surface-mount, lead-free, matte tin plated). Dimensions per Allegro drawing 802840: 2.98 × 1.49 × 1.00 mm, branded face orientation critical for magnetic field polarity alignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Accepts 4.5–5.5 V; internal Zener clamp activates above 6 V to prevent damage |
| VOUT (Pin 2) | Analog output | Rail-to-rail, low-impedance (≤3 Ω), capable of sourcing/sinking ±1 mA into 4.7 kΩ load |
| GND (Pin 3) | Reference ground | Common return for supply and output; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 150 kHz internal clock eliminates thermal/mechanical drift, enabling <±10 G equivalent offset stability over temperature cycling |
| Ratiometric rail-to-rail output | Output scales with VCC; quiescent point remains at 50% VCC and sensitivity maintains ±1.5% ratiometry - simplifies power supply tolerance design |
| High-temperature qualification | Specified and tested from –40 °C to +150 °C ambient - meets AEC-Q100 Grade 0 requirements for under-hood use |
| Integrated gain/offset trim | Laser-trimmed at end-of-line - achieves ±1.5% linearity and ±1.5% symmetry without external calibration |
| Robust EMC protection | Designed to withstand automotive-level ESD (±8 kV HBM) and radiated immunity - reduces need for external transient suppression |
Applications
| Automotive Throttle Position Sensing | Industrial Rotary Valve Control |
|---|---|
|
Use Scenario: Monitoring angular position of electronic throttle bodies in gasoline/diesel engines under hood temperatures up to 150 °C. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet rotation angle, interfaced directly to engine control unit (ECU) ADC. Use Value: Stable 3.125 mV/G sensitivity and ±1.5% linearity ensure accurate air-fuel ratio calculation across full temperature range without recalibration. |
Use Scenario: Closed-loop position feedback for pneumatic/hydraulic rotary actuators in oil & gas pipeline valves operating in ambient –40 °C to +85 °C environments. IC Role / Device Role / Timing Role: Ratiometric analog sensor converting magnet rotation into voltage signal for PLC analog input modules. Use Value: Rail-to-rail output and 30 kHz bandwidth enable real-time valve positioning with <1 ms response time and immunity to supply ripple. |
| Brake Pedal Position Detection | Electric Power Steering (EPS) Motor Commutation |
|
Use Scenario: Redundant pedal travel sensing in brake-by-wire systems where failure modes must be detectable via dual-sensor comparison. IC Role / Device Role / Timing Role: Primary analog position transducer mounted on pedal linkage; outputs voltage scaled to pedal displacement. Use Value: Dynamic offset cancellation ensures <±10 G zero-point stability after thermal cycling - critical for fail-safe redundancy validation. |
Use Scenario: Rotor position feedback for brushless DC motor commutation in EPS assist motors exposed to under-dash temperatures up to 125 °C. IC Role / Device Role / Timing Role: High-bandwidth Hall sensor feeding position data to motor controller for sinusoidal or trapezoidal commutation. Use Value: 30 kHz bandwidth and 25 mVPP noise allow clean commutation timing at motor speeds >8,000 RPM without phase error. |
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 | Direct replacement per Allegro's obsolescence notice; identical pinout, same LH package, same 3.125 mV/G sensitivity and –40 °C to +150 °C rating | Production status: active (not discontinued); supports new designs and long-term supply continuity | Select for all new designs requiring drop-in compatibility and guaranteed availability beyond 2025 |
| APS12605KLA | Higher sensitivity (5.0 mV/G), wider supply (3.0–5.5 V), but narrower temp range (–40 °C to +125 °C); different pinout (SOIC-8) | Requires PCB redesign; suitable only where higher resolution outweighs thermal range loss and layout change cost | Consider only if sensitivity upgrade justifies requalification and board revision |
Compared with A1322LLHLT-T, the A1325LLHLX-T offers identical electrical and mechanical specifications with active production status, while the APS12605KLA trades temperature range and pin compatibility for higher sensitivity and broader supply flexibility-making it a functional alternative only in thermally constrained, non-automotive applications.
Availability
A1322LLHLT-T is available at Aetrix Electronics and suitable for automotive throttle sensing, industrial valve control, and brake pedal position monitoring requiring stable component supply despite end-of-life status.
Supply support for A1322LLHLT-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 semiconductor company specializing in magnetic sensing, power ICs, and precision motion control solutions for automotive and industrial markets.
The A132X family was designed specifically for high-reliability linear and rotary position sensing in harsh thermal environments-targeting engine, transmission, and chassis subsystems where analog accuracy and thermal stability are critical.
FAQ
Is the A1322LLHLT-T still in production?
No, the A1322LLHLT-T is a discontinued product per Allegro's official status update dated October 31, 2011. It is no longer manufactured, and samples are unavailable. Aetrix Electronics provides remaining inventory with full traceability and supports legacy design sustainment through controlled allocation and cross-reference guidance to A1325LLHLX-T.
What is the correct replacement for the A1322LLHLT-T?
The officially designated replacement is the A1325LLHLX-T, as stated in Allegro's obsolescence notice. It shares identical pinout, package (SOT-23W), sensitivity (3.125 mV/G), operating temperature range (–40 °C to +150 °C), and ratiometric behavior-making it a true drop-in solution for existing designs and new projects requiring long-term supply assurance.
Can the A1322LLHLT-T operate at 12 V supply?
No-the A1322LLHLT-T has an absolute maximum supply voltage of 8 V, and its specified operating range is strictly 4.5–5.5 V. Applying 12 V will trigger the internal Zener clamp, causing excessive current draw and potential thermal damage. System designs must regulate to 5 V ±10% or use the A1325LLHLX-T with identical voltage constraints.
What does "LLHLT-T" mean in the A1322LLHLT-T part number?
In A1322LLHLT-T: "LL" denotes high-temperature grade (–40 °C to +150 °C), "H" indicates SOT-23W package (LH suffix), "L" specifies lead-free matte tin plating, and "T" confirms tape-and-reel packaging (3,000 pieces per 7-inch reel). This full suffix confirms the exact variant used in automotive-grade, surface-mount applications.
How does the dynamic offset cancellation work in the A1322LLHLT-T?
The A1322LLHLT-T uses an internal 150 kHz high-frequency clock to periodically reverse the Hall element bias and sample differential offsets. This chopper-stabilized technique cancels low-frequency drift from thermal stress, molding-induced strain, and temperature gradients-resulting in <±10 G equivalent quiescent stability over –40 °C to +150 °C without external compensation components.
A1322LLHLT-T 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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- SOT-23W
- Mounting Type:
- Surface Mount
A1322LLHLT-T FAQ
1.How can I place an order for A1322LLHLT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1322LLHLT-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 A1322LLHLT-T reliable?
The price and inventory of A1322LLHLT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1322LLHLT-T is usually 5 days.
3.What payment methods are accepted for A1322LLHLT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1322LLHLT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1322LLHLT-T?
A1322LLHLT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1322LLHLT-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 A1322LLHLT-T?
For technical support, including A1322LLHLT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1322LLHLT-T requirements.
6.How does Aetrix verify that A1322LLHLT-T is sourced from the original manufacturer or authorized distributors?
All A1322LLHLT-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 A1322LLHLT-T meets industry standards.
7.What is the process for return or replacement of A1322LLHLT-T?
All A1322LLHLT-T units undergo pre-shipment inspection (PSI). If there is an issue with A1322LLHLT-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 A1322LLHLT-T part is unused and in its original packaging.
Return procedure for A1322LLHLT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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