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Allegro MicroSystems A1322LLHLT
- Part No.:
- A1322LLHLT
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1322LLHLT.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
A1322LLHLT from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature operation in automotive and industrial position sensing. It delivers 3.125 mV/G sensitivity, rail-to-rail output voltage (0.2 V to 4.7 V), quiescent output at 2.5 V (±75 mV), operates from 4.5–5.5 V, and supports –40°C to +150°C ambient range.
For engineers reviewing the A1322LLHLT datasheet, A1322LLHLT pinout, A1322LLHLT application, or A1322LLHLT equivalent, this page provides verified technical context, package mapping, real-world use scenarios, and validated alternative options for legacy design continuity and obsolescence mitigation.
Technical Context
The A1322LLHLT integrates a Hall element, temperature-compensating circuitry, high-gain amplifier, and rail-to-rail output stage in a single BiCMOS monolithic die. Its dynamic offset cancellation uses a 150 kHz internal clock to suppress thermal stress and molding-induced drift.
It features ratiometric behavior-both quiescent voltage and sensitivity scale linearly with supply voltage-and achieves ±1.5% linearity, ±1.5% symmetry, and ±10 G equivalent accuracy over temperature via intrinsic gain/offset trimming and proprietary offset correction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 3.125 mV/G typical at 25°C - enables precise analog field measurement with minimal external gain |
| Operating Temperature | –40°C to +150°C - qualified for under-hood automotive and industrial motor control environments |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V systems; ratiometric scaling maintains accuracy across supply variation |
| Quiescent Output | 2.5 V ±75 mV at 25°C - stable mid-supply reference simplifies ADC interfacing and fault detection |
| Output Bandwidth | 30 kHz - supports fast-responding position feedback in rotating machinery and throttle actuation |
| Noise (p-p) | 25 mV max with 0.1 μF bypass - low-noise performance enables high-resolution field detection without external filtering |
| Package | SOT-23W (LH) - surface-mount 3-pin thermally enhanced package with 228°C/W junction-to-ambient on 1-layer PCB |
Pinout & Package
Package: SOT-23W (3-pin surface-mount, lead-free, matte tin plated leadframe). Dimensions per Allegro drawing 802840: 2.98 × 1.49 × 1.00 mm, branded face identifies active Hall area depth (0.28 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Accepts 4.5–5.5 V; includes internal Zener clamp (6–8.3 V) for transient protection |
| VOUT (Pin 2) | Analog output | Rail-to-rail voltage output proportional to magnetic flux; drives ≥4.7 kΩ load with ≤10 nF capacitance |
| GND (Pin 3) | Reference ground | Return path for supply and output; must be low-impedance to maintain noise immunity and offset stability |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 150 kHz internal clock eliminates residual offset from thermal stress and overmolding, enabling ±10 G accuracy over temperature |
| Temperature-stable quiescent voltage | ±1.5% ratiometric drift over supply and ±10 G equivalent drift over –40°C to +150°C ensures reliable zero-field reference |
| Rail-to-rail output stage | 0.2 V to 4.7 V swing at ±1 mA load allows full utilization of 5 V ADC range without level-shifting |
| High-temperature qualification | Rated for 150°C ambient with 165°C max junction temperature - suitable for engine compartment and motor housing placement |
| Robust EMC protection | Integrated filtering and BiCMOS design provide inherent immunity to EMI in noisy automotive and industrial environments |
Applications
| Throttle Position Sensing | Brake Pedal Position Sensing |
|---|---|
Use Scenario: Analog measurement of rotational angle in drive-by-wire throttle bodies exposed to under-hood temperatures up to 150°C. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing ratiometric voltage output proportional to magnet displacement. Use Value: Stable 3.125 mV/G sensitivity and ±1.5% linearity enable <1° angular resolution without calibration across temperature extremes. |
Use Scenario: Contactless detection of brake pedal travel in ABS/EBA systems where reliability and long-term drift are critical. IC Role / Device Role / Timing Role: High-temperature analog sensor converting mechanical stroke into proportional voltage for ECU interpretation. Use Value: Immunity to mechanical stress and precise recoverability after thermal cycling ensure consistent pedal feel and safety-critical response. |
| Transmission Gear Selector | Electric Power Steering (EPS) Motor Rotor Position |
Use Scenario: Detection of PRNDL lever position in automatic transmissions operating near hot exhaust manifolds. IC Role / Device Role / Timing Role: Ratiometric Hall sensor delivering fail-safe analog output for gear state validation. Use Value: Quiescent output stability (±75 mV) and ratiometric supply tracking eliminate need for separate voltage references in multi-sensor modules. |
Use Scenario: Low-latency rotor position feedback in brushless EPS motors requiring continuous operation at 130°C+ case temperature. IC Role / Device Role / Timing Role: High-bandwidth (30 kHz) linear sensor feeding closed-loop commutation logic. Use Value: 150°C ambient rating and 25 mV p-p noise floor support accurate field vector estimation without oversampling or filtering overhead. |
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 discontinuation notice; identical SOT-23W package, same 3.125 mV/G sensitivity, improved production status | Same pinout and electrical interface; supports new designs with extended lifecycle and current availability | Select for new designs requiring guaranteed supply and full manufacturer support |
| ACS724LLCTR-3.125B-T | Current sensor (not field sensor); measures current via integrated conductor; 3.125 mV/A output, not mV/G | Replaces A1322LLHLT only in current-sensing roles (e.g., motor phase monitoring), not magnetic position sensing | Use only when measuring conductor current-not magnetic field-within same 3.125 scaling factor |
Compared with A1322LLHLT, the A1325LLHLX-T offers identical functionality with active production status and full Allegro support, while the ACS724LLCTR-3.125B-T serves a fundamentally different sensing modality-current versus magnetic field-requiring redesign of the magnetic coupling path and signal conditioning.
Availability
A1322LLHLT is available at Aetrix Electronics and suitable for automotive throttle sensing, brake pedal position monitoring, transmission gear detection, and electric power steering rotor position feedback requiring stable component supply despite end-of-life status.
Supply support for A1322LLHLT 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 of high-performance magnetic sensing and power ICs, specializing in robust solutions for automotive, industrial, and consumer motion control.
The A132X family was engineered specifically for high-temperature linear and rotary position sensing in harsh environments, emphasizing ratiometric stability, mechanical stress immunity, and precision analog output without external compensation.
FAQ
Is the A1322LLHLT still in production?
No-the A1322LLHLT is a discontinued product as confirmed by Allegro's official documentation dated October 31, 2011. It is no longer manufactured, and samples are unavailable. For new designs, Allegro recommends the A1325LLHLX-T as its designated replacement with identical specifications and active production status.
What is the correct pinout for the A1322LLHLT?
The A1322LLHLT uses the SOT-23W (LH) package with Pin 1 = VCC, Pin 2 = VOUT, and Pin 3 = GND. This pin assignment is explicitly documented in the Allegro A1321–A1323 datasheet Terminal List and Pin-out Drawings, and matches the physical layout shown in drawing 802840.
Can the A1322LLHLT operate at 150°C ambient temperature?
Yes-the A1322LLHLT is rated for –40°C to +150°C ambient operation and has a maximum junction temperature of 165°C. Its thermal resistance (RθJA) is 228°C/W on a 1-layer PCB, so proper board layout and power derating are required to maintain safe junction temperature at maximum ambient.
What does "ratiometric" mean for the A1322LLHLT?
For the A1322LLHLT, ratiometric means both its quiescent output voltage (2.5 V) and sensitivity (3.125 mV/G) scale linearly with supply voltage. If VCC drops from 5.0 V to 4.5 V, VOUT(q) shifts from 2.5 V to ~2.25 V and sensitivity reduces proportionally-preserving measurement accuracy without external voltage references.
How does the A1322LLHLT achieve low offset drift?
The A1322LLHLT uses a proprietary dynamic offset cancellation technique with a 150 kHz internal clock that continuously recalibrates the Hall element and amplifier offsets. This eliminates residual voltage errors caused by thermal stress, overmolding, and temperature cycling-delivering ±10 G equivalent accuracy over its full operating range.
A1322LLHLT 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 FAQ
1.How can I place an order for A1322LLHLT through Aetrix?
Please submit a Request for Quotation (RFQ) for A1322LLHLT 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 reliable?
The price and inventory of A1322LLHLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1322LLHLT is usually 5 days.
3.What payment methods are accepted for A1322LLHLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1322LLHLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1322LLHLT?
A1322LLHLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1322LLHLT 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?
For technical support, including A1322LLHLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1322LLHLT requirements.
6.How does Aetrix verify that A1322LLHLT is sourced from the original manufacturer or authorized distributors?
All A1322LLHLT 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 meets industry standards.
7.What is the process for return or replacement of A1322LLHLT?
All A1322LLHLT units undergo pre-shipment inspection (PSI). If there is an issue with A1322LLHLT, 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 part is unused and in its original packaging.
Return procedure for A1322LLHLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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