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Allegro MicroSystems A1323LLHLT
- Part No.:
- A1323LLHLT
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- SOT-23W
- Datasheet:
-
A1323LLHLT.pdf
- Description:
- SENSOR HALL EFFECT ANALOG SOT23W
- Quantity:
- Payment:
- Shipping:
Inventory:3,701
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Product details
Overview
A1323LLHLT from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature operation (–40 °C to +150 °C), delivering 2.5 mV/G sensitivity, rail-to-rail output, and quiescent output voltage at 50% of VCC. It integrates a Hall element, temperature-compensated amplifier, and dynamic offset cancellation circuitry for stable performance in automotive throttle position and industrial rotary sensing.
For engineers reviewing the A1323LLHLT datasheet, A1323LLHLT pinout, A1323LLHLT application, or A1323LLHLT equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for legacy design continuity and obsolescence mitigation.
Technical Context
The A1323LLHLT implements a BiCMOS monolithic architecture integrating a Hall element, high-gain amplifier, rail-to-rail output stage, and proprietary dynamic offset cancellation using a 150 kHz internal clock to suppress thermal stress and molding-induced drift. Its output voltage is strictly ratiometric-both quiescent voltage and sensitivity scale linearly with supply voltage.
It operates from 4.5 V to 5.5 V, draws ≤8 mA supply current, achieves ±1.5% linearity and symmetry, and maintains ±10 G equivalent accuracy over temperature via on-chip gain/offset trim. The device is qualified for harsh environments with robust EMC protection and solid-state reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G typical - enables precise low-field magnetic detection in position feedback loops |
| Operating Temperature | –40 °C to +150 °C - supports under-hood automotive and industrial motor control applications |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V microcontroller I/O domains |
| Quiescent Output Voltage | 2.5 V ±75 mV at 5 V supply - ratiometric 50% VCC baseline simplifies ADC reference alignment |
| Output Bandwidth | 30 kHz - sufficient for real-time throttle and pedal position tracking up to 300 Hz mechanical input |
| Noise (p-p) | 20 mV max with 0.1 μF bypass capacitor - low-noise output reduces need for external filtering |
| Package | SOT-23W (LH) - surface-mount 3-pin footprint with branded face orientation for consistent Hall axis alignment |
Pinout & Package
Package: SOT-23W (3-pin surface-mount, LH suffix), lead-free with 100% matte tin plating. Branded face identifies Hall sensing direction perpendicular to package top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Connects to regulated 4.5–5.5 V rail; includes internal Zener clamp (6–8.3 V) for transient protection |
| VOUT (Pin 2) | Analog output | Rail-to-rail, low-impedance (≤3 Ω) voltage output proportional to magnetic flux density; requires ≥4.7 kΩ load |
| GND (Pin 3) | Ground reference | Common return path for supply and output; must be low-impedance to maintain ratiometric accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 150 kHz clock-driven technique eliminates residual offset from thermal stress and overmolding, ensuring <±10 G equivalent accuracy over temperature |
| Ratiometric output | Both VOUT(q) and sensitivity track VCC within ±1.5%, removing need for separate voltage references in 5 V systems |
| High-temperature stability | ΔSens(TAmax) ≤ ±5% for LH package - minimal sensitivity drift from hot-to-room cycling enables reliable operation at 150 °C ambient |
| Robust EMC protection | Integrated filtering and layout-optimized die design provide immunity to radiated and conducted noise in automotive ECU environments |
| End-of-line trimming | Factory gain and offset calibration ensures tight initial tolerance (±1.5% linearity, ±1.5% symmetry) without system-level calibration |
Applications
| Automotive Throttle Position Sensing | Industrial Rotary Valve Control |
|---|---|
|
Use Scenario: Monitoring angular position of engine throttle plates in gasoline direct injection systems. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage output proportional to magnet rotation angle. Use Value: Stable 2.5 mV/G sensitivity and ±1.5% linearity over –40 °C to +150 °C ensure accurate air-fuel ratio control without recalibration across thermal cycles. |
Use Scenario: Closed-loop position feedback for pneumatic rotary actuators in chemical process valves. IC Role / Device Role / Timing Role: Ratiometric magnetic field transducer converting magnet displacement into calibrated voltage for PLC analog input. Use Value: Rail-to-rail output and 30 kHz bandwidth support fast valve response times while maintaining signal integrity in electrically noisy plant-floor environments. |
| Electric Power Steering Motor Commutation | Heavy-Duty Brake Pedal Position Sensing |
|
Use Scenario: Detecting rotor position in brushless DC assist motors for EPS systems. IC Role / Device Role / Timing Role: High-temperature-stable Hall sensor feeding commutation logic in motor control ICs. Use Value: Immunity to mechanical stress and precise recoverability after temperature cycling prevent torque ripple or phase misalignment during cold-start and sustained high-load operation. |
Use Scenario: Redundant pedal travel measurement in commercial vehicle braking systems. IC Role / Device Role / Timing Role: Primary analog position sensor in dual-redundant brake-by-wire subsystems. Use Value: Solid-state reliability and ±2% sensitivity drift over time meet ASIL-B functional safety requirements for fail-operational redundancy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ratiometric linear Hall-effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1326LLHLX-T | Same LH package, identical pinout, 2.5 mV/G sensitivity, but rated for –40 °C to +150 °C with improved ΔSens(TAmin) spec (–3.5% to +8.5%) and production status. | Drop-in replacement with extended lifecycle support; designed specifically as the designated successor per Allegro's obsolescence notice. | Select for new designs requiring long-term supply continuity and full production availability. |
| A1323LUA-T | Same sensitivity and electrical specs, but SIP through-hole (UA) package instead of SOT-23W; lower thermal resistance (165 °C/W vs 228 °C/W) but larger footprint. | Preferred where board-level thermal management is constrained and manual assembly or rework is required. | Use only if SMT capability is unavailable and thermal derating margins allow UA package operation at 150 °C ambient. |
Compared with A1323LLHLT, A1326LLHLX-T offers guaranteed production continuity and identical form-fit-function, while A1323LUA-T trades surface-mount compatibility for easier thermal handling and through-hole assembly-neither is pin-compatible with A1323LLHLT due to differing packages, but both serve the same core sensing function in validated automotive and industrial contexts.
Availability
A1323LLHLT is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial rotary valve control, and heavy-duty brake pedal position sensing requiring stable component supply despite end-of-life status.
Supply support for A1323LLHLT 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 and power ICs, with deep expertise in automotive-grade Hall-effect technology and high-reliability analog solutions.
The A132X family was engineered for high-temperature linear position sensing in automotive powertrain and industrial motion control, emphasizing ratiometric stability, mechanical stress immunity, and robust EMC performance.
FAQ
What is the operating temperature range of the A1323LLHLT?
The A1323LLHLT is rated for an ambient operating temperature range of –40 °C to +150 °C. This specification is confirmed in the Selection Guide table and Absolute Maximum Ratings section of the official datasheet. The device achieves this rating via BiCMOS process optimization, on-die temperature compensation, and SOT-23W package thermal design. Operation beyond 150 °C ambient requires derating per the power dissipation curves in the datasheet.
Is the A1323LLHLT still in production?
No, the A1323LLHLT is a discontinued product. Allegro MicroSystems explicitly states "This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available." Its last status update was October 31, 2011, and it is classified as "Discontinued Product" in the official documentation.
What is the sensitivity of the A1323LLHLT and how is it defined?
The A1323LLHLT has a typical sensitivity of 2.5 mV/G, measured at TA = 25 °C with VCC = 5 V and IOUT = –1 mA. Sensitivity is defined as the change in output voltage per unit magnetic flux density applied perpendicular to the branded face. The datasheet specifies min/typ/max bounds of 2.375/2.500/2.625 mV/G, with ratiometric stability (±1.5% ΔSens(ΔV)) across the supply voltage range.
What package type does the A1323LLHLT use and what are its key mechanical features?
The A1323LLHLT uses the SOT-23W (LH) package: a 3-pin surface-mount outline with branded face orientation, 0.28 mm active area depth, and 100% matte tin-plated leadframe. Key mechanical features include 2.98 mm × 1.91 mm body dimensions, 0.95 mm pin pitch, and thermal resistance of 228 °C/W on a 1-layer PCB-values confirmed in the Package Drawing and Thermal Characteristics sections.
How does the ratiometric behavior of the A1323LLHLT affect system design?
The A1323LLHLT exhibits true ratiometric behavior: both its quiescent output voltage (VOUT(q)) and sensitivity scale linearly with VCC, with deviations limited to ±1.5% over 4.5–5.5 V. This allows direct interfacing with 5 V ADCs without external voltage references, simplifies power supply design, and inherently compensates for minor VCC fluctuations-critical for robustness in automotive and industrial 5 V domains where supply regulation may vary.
A1323LLHLT 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
A1323LLHLT FAQ
1.How can I place an order for A1323LLHLT through Aetrix?
Please submit a Request for Quotation (RFQ) for A1323LLHLT 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 A1323LLHLT reliable?
The price and inventory of A1323LLHLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1323LLHLT is usually 5 days.
3.What payment methods are accepted for A1323LLHLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1323LLHLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1323LLHLT?
A1323LLHLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1323LLHLT 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 A1323LLHLT?
For technical support, including A1323LLHLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1323LLHLT requirements.
6.How does Aetrix verify that A1323LLHLT is sourced from the original manufacturer or authorized distributors?
All A1323LLHLT 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 A1323LLHLT meets industry standards.
7.What is the process for return or replacement of A1323LLHLT?
All A1323LLHLT units undergo pre-shipment inspection (PSI). If there is an issue with A1323LLHLT, 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 A1323LLHLT part is unused and in its original packaging.
Return procedure for A1323LLHLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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