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Allegro MicroSystems A1323LUA
- Part No.:
- A1323LUA
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1323LUA.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,220
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Product details
Overview
A1323LUA from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC in a 3-pin SIP (Single In-line Package) for high-temperature automotive and industrial position sensing. It delivers 2.5 mV/G sensitivity, 4.5–5.5 V supply operation, rail-to-rail output, and ±10 G equivalent quiescent voltage drift over –40°C to +150°C ambient range - used in throttle pedal and brake pedal position feedback circuits.
For engineers reviewing the A1323LUA datasheet, A1323LUA pinout, A1323LUA application, or A1323LUA equivalent, key selection criteria include its 2.5 mV/G sensitivity grade, UA-package thermal resistance (165°C/W), ratiometric output stability, and discontinuation status requiring legacy design support and obsolescence-aware sourcing.
Technical Context
The A1323LUA integrates a BiCMOS monolithic circuit with Hall element, temperature-compensating circuitry, high-gain amplifier, and rail-to-rail output stage. Its proprietary dynamic offset cancellation uses a 150 kHz internal clock to suppress mechanical stress-induced drift and enable stable quiescent output voltage across temperature cycling.
It operates ratiometrically: quiescent output is 50% of VCC, and sensitivity scales linearly with supply voltage. Output bandwidth is 30 kHz, noise is ≤20 mV peak-to-peak (Cbypass = 0.1 μF), and it supports sink/source currents up to ±1.5 mA with 1.5 Ω typical output resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 2.5 mV/G at TA = 25°C - defines magnetic field resolution for linear position measurement |
| Quiescent Output Voltage | 2.5 V ±75 mV at VCC = 5 V - enables zero-field reference without external biasing |
| Supply Voltage Range | 4.5–5.5 V - compatible with standard 5 V automotive and industrial rails |
| Operating Ambient Range | –40°C to +150°C - qualified for under-hood and transmission-mounted applications |
| Output Bandwidth | 30 kHz - supports real-time response in fast-actuating pedal or valve systems |
| Output Noise (pk-pk) | ≤20 mV with 0.1 μF bypass capacitor - ensures clean analog signal for ADC sampling |
| Thermal Resistance (RθJA) | 165°C/W (1-layer PCB, UA package) - informs heatsinking requirements at max ambient |
Pinout & Package
Package: 3-pin Single In-line Package (SIP), lead-free, matte tin-plated leadframe (suffix UA). Body dimensions: 15.75 mm × 4.09 mm × 3.02 mm (L×W×H); branded face identifies active Hall surface orientation.
| 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 |
| GND (Pin 2) | Ground reference | Return path for supply current and output load; must be low-impedance for noise immunity |
| VOUT (Pin 3) | Analog output terminal | Rail-to-rail voltage proportional to magnetic flux density; drives ≥4.7 kΩ load |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric output | Quiescent voltage and sensitivity scale linearly with VCC - eliminates need for precision voltage references in supply-varying environments |
| Dynamic offset cancellation | 150 kHz internal clock reduces residual offset from molding stress and thermal gradients - ensures <±10 G equivalent drift over temperature |
| High-temperature stability | Specified performance maintained from –40°C to +150°C ambient - validated for automotive powertrain and industrial motor control locations |
| Robust EMC protection | Integrated filtering and layout-optimized die design - meets automotive-level radiated and conducted immunity requirements without external shielding |
| BiCMOS monolithic integration | Hall element, amplifier, and output stage on single die - minimizes parasitic coupling and improves signal integrity vs. discrete solutions |
Applications
| Automotive Throttle Position Sensing | Industrial Linear Actuator Feedback |
|---|---|
Use Scenario: Measures angular displacement of throttle butterfly valve via magnet attached to shaft. IC Role / Device Role / Timing Role: Analog magnetic field transducer providing continuous ratiometric voltage output proportional to pedal angle. Use Value: Enables closed-loop engine control with 2.5 mV/G resolution and stable zero-point across thermal cycles - critical for emissions compliance and drivability. |
Use Scenario: Monitors extension/retraction of hydraulic cylinder rod using side-facing magnet. IC Role / Device Role / Timing Role: High-temperature linear position sensor interfacing directly to PLC analog input module. Use Value: Delivers reliable 0–5 V output over –40°C to +150°C without recalibration - reduces maintenance in harsh factory environments. |
| Brake Pedal Position Monitoring | Motor Commutation Timing Reference |
Use Scenario: Detects driver brake pedal travel for electronic stability control (ESC) and regenerative braking coordination. IC Role / Device Role / Timing Role: Safety-critical analog sensor feeding redundant ECU channels with ratiometric output. Use Value: Maintains ±1.5% ratiometry and ±1.5% linearity over full temperature range - satisfies ASIL-B functional safety requirements. |
Use Scenario: Provides commutation timing signal for BLDC motor by sensing rotor magnet position near stator end-bell. IC Role / Device Role / Timing Role: Low-latency magnetic field detector enabling precise 30 kHz switching synchronization. Use Value: 30 kHz bandwidth and rail-to-rail output ensure accurate zero-crossing detection - improves motor efficiency and torque ripple suppression. |
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 |
|---|---|---|---|
| A1326LUA-T | Same UA package, 2.5 mV/G sensitivity, but rated for –40°C to +150°C with improved ΔSens(TAmax) spec (–2.5% to +7.5%) | Direct replacement per Allegro's discontinuation notice; supports new designs where A1323LUA is obsolete | Select A1326LUA-T for new designs requiring identical form-factor and sensitivity with extended lifetime availability. |
| ACS724LLCTR-20AU-T | Current sensor (not Hall voltage sensor); 20 A range; SOIC-8 package; digital output option available | Measures conductor current rather than magnetic field - unsuitable for position sensing but viable for motor phase current monitoring | Choose only if application shifts from position feedback to current sensing; requires PCB redesign and signal conditioning changes. |
Compared with A1323LUA, A1326LUA-T offers identical pinout, sensitivity, and package but with updated production status and tighter high-temperature sensitivity drift specs; ACS724LLCTR-20AU-T serves a fundamentally different measurement function and cannot substitute in position-sensing roles.
Availability
A1323LUA is available at Aetrix Electronics and suitable for legacy automotive ECU repair, industrial equipment maintenance, and obsolescence-mitigation programs requiring stable component supply for discontinued high-temperature Hall sensors.
Supply support for A1323LUA 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 motor driver solutions for automotive and industrial markets.
The A132X family was designed specifically for high-reliability linear and rotary position sensing in extreme-temperature environments such as engine compartments and industrial actuators.
FAQ
Is A1323LUA still in production?
No, A1323LUA is a discontinued product. Allegro MicroSystems declared it Not For New Design as of January 31, 2011, and ceased sample availability. Aetrix Electronics maintains limited legacy stock for repair and maintenance use, with full traceability and documentation. For new designs, A1326LUA-T is the recommended replacement.
What is the correct pinout for A1323LUA?
The A1323LUA uses a 3-pin SIP package with Pin 1 = VCC, Pin 2 = GND, Pin 3 = VOUT. This matches the UA package pinout shown in Allegro's A1321-DS Rev. 23 datasheet, Figure "Pin-out Drawings" - confirmed across all A132X-UA variants including A1323LUA-T.
Can A1323LUA operate at 12 V supply?
No, A1323LUA is rated for 4.5–5.5 V operation only. Supplying 12 V exceeds its absolute maximum rating (8 V) and will trigger internal Zener clamping, increasing current draw and risking thermal damage. It must be powered from a regulated 5 V rail - not direct battery or unregulated 12 V sources.
What does "ratiometric" mean for A1323LUA?
For A1323LUA, ratiometric means both quiescent output voltage (2.5 V at 5 V supply) and sensitivity (2.5 mV/G) scale linearly with VCC. If VCC drops to 4.5 V, quiescent output becomes ~2.25 V and sensitivity drops to ~2.25 mV/G - preserving measurement ratio without external calibration.
How does A1323LUA handle temperature-induced offset drift?
A1323LUA uses proprietary dynamic offset cancellation with a 150 kHz internal clock to continuously null residual offset from thermal stress and packaging effects. This achieves ≤±10 G equivalent quiescent voltage drift over –40°C to +150°C - verified in Allegro's Typical Characteristics plots (Fig. A1323, page 8).
A1323LUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 3-SSIP
- Packaging:
- Bulk
- 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:
- 3-SIP
- Mounting Type:
- Through Hole
A1323LUA FAQ
1.How can I place an order for A1323LUA through Aetrix?
Please submit a Request for Quotation (RFQ) for A1323LUA 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 A1323LUA reliable?
The price and inventory of A1323LUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1323LUA is usually 5 days.
3.What payment methods are accepted for A1323LUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1323LUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1323LUA?
A1323LUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1323LUA 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 A1323LUA?
For technical support, including A1323LUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1323LUA requirements.
6.How does Aetrix verify that A1323LUA is sourced from the original manufacturer or authorized distributors?
All A1323LUA 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 A1323LUA meets industry standards.
7.What is the process for return or replacement of A1323LUA?
All A1323LUA units undergo pre-shipment inspection (PSI). If there is an issue with A1323LUA, 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 A1323LUA part is unused and in its original packaging.
Return procedure for A1323LUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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