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

Allegro MicroSystems A1323ELHLT

Name: A1323ELHLT
Brand: Allegro MicroSystems
SKU: A1323ELHLT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A1323ELHLT

Manufacturer:: Allegro MicroSystems

Category:: Linear, Compass (ICs)

Package:: SOT-23W

Datasheet:: A1323ELHLT.pdf

Description:: SENSOR HALL EFFECT ANALOG SOT23W

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Product details

Overview

A1323ELHLT from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature operation in automotive and industrial position sensing. It delivers 2.5 mV/G sensitivity, 50% V_CC quiescent output voltage, and rail-to-rail analog output across –40°C to +85°C ambient range. Its BiCMOS monolithic design integrates Hall element, dynamic offset cancellation, and temperature-compensated amplifier for stable performance in harsh environments.

For engineers reviewing the A1323ELHLT datasheet, A1323ELHLT pinout, A1323ELHLT application, or A1323ELHLT equivalent, key selection criteria include its 2.5 mV/G sensitivity, SOT-23W (LH) package, 4.5–5.5 V supply range, ±1.5% linearity, and ratiometric output behavior under varying V_CC and temperature.

Technical Context

The A1323ELHLT uses a proprietary high-frequency dynamic offset cancellation clock (150 kHz) to suppress residual offset caused by molding stress and thermal gradients. Its internal gain and offset trim occur at end-of-line, ensuring precise quiescent voltage (2.425–2.575 V at 5 V_CC) and stable sensitivity over temperature.

This device implements a rail-to-rail output stage with <3 Ω output resistance and supports up to 10 nF load capacitance. Its 30 kHz bandwidth and low 20 mV_PP noise (with 0.1 μF bypass) enable accurate analog field measurement without external filtering in compact layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Sensitivity	2.5 mV/G typical - enables precise analog magnetic field measurement with 0.4 G resolution at 1 V output swing
Quiescent Output Voltage	2.5 V ±0.075 V at 5 V_CC, 25°C - ratiometric 50% V_CC baseline simplifies differential signal processing
Supply Voltage Range	4.5–5.5 V - compatible with standard 5 V automotive and industrial rails; Zener clamp activates above 8 V
Operating Temperature	–40°C to +85°C - qualified for under-hood and industrial control cabinet use without derating
Output Bandwidth	30 kHz - supports real-time position tracking up to ~4.8 kHz mechanical rotation (with Nyquist margin)
Noise (Peak-to-Peak)	20 mV - measured with 0.1 μF bypass capacitor; enables sub-milligauss resolution in low-speed applications
Linearity Error	±1.5% - ensures monotonic response across full magnetic range; critical for closed-loop feedback accuracy

Pinout & Package

Package: 3-pin SOT-23W (suffix LH), surface-mount, Pb-free with 100% matte tin leadframe. Dimensions: 2.98 × 1.49 × 1.00 mm (L×W×H), active area depth 0.28 mm.

Pin/Terminal	Circuit Role	Design Meaning
V_CC (Pin 1)	Positive supply input	Accepts 4.5–5.5 V; internal Zener clamps at 6–8.3 V to protect against transients
V_OUT (Pin 2)	Analog output terminal	Rail-to-rail voltage output proportional to B-field; drives ≥4.7 kΩ loads with <3 Ω source impedance
GND (Pin 3)	Reference ground	Return path for supply and output; must be low-impedance to minimize noise coupling into Hall element

Key Features

Feature	Design Value
Dynamic offset cancellation	150 kHz internal clock eliminates thermal drift and mechanical stress-induced offset, enabling ±10 G stability over temperature cycling
Ratiometric output	Both quiescent voltage and sensitivity scale with V_CC; ±1.5% ratiometry ensures immunity to supply ripple in noisy environments
Temperature-compensated BiCMOS	Integrated Hall element + amplifier on single die reduces parasitic coupling; achieves ±2% sensitivity drift after thermal cycling
Robust EMC protection	Designed to meet automotive-level ESD (±8 kV HBM) and radiated immunity requirements without external shielding
High-temperature reliability	Qualified to 150°C junction temperature; 110°C/W thermal resistance on 2-layer PCB enables sustained operation at 85°C ambient

Applications

Throttle Position Sensing	Brake Pedal Position Sensing
Use Scenario: Non-contact measurement of throttle plate angle in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet displacement on rotating shaft. Use Value: 2.5 mV/G sensitivity and ±1.5% linearity ensure <0.5° angular resolution; ratiometric output rejects 5 V rail noise common in engine bays.	Use Scenario: Detection of brake pedal travel in hydraulic or electro-hydraulic braking systems. IC Role / Device Role / Timing Role: Analog magnetic field transducer converting linear magnet motion into calibrated voltage output. Use Value: Stable quiescent voltage (2.5 V ±0.075 V) enables zero-point calibration at system power-up; 30 kHz bandwidth supports fast pedal release detection.
Industrial Valve Position Feedback	Motor Commutation Monitoring
Use Scenario: Closed-loop position control of pneumatic/hydraulic valves in factory automation and process control. IC Role / Device Role / Timing Role: High-reliability linear sensor interfacing with PLC analog inputs for real-time valve stem monitoring. Use Value: –40°C to +85°C operating range and solid-state construction eliminate potentiometer wear; 20 mV_PP noise allows sub-1% full-scale error without averaging.	Use Scenario: Rotor position detection for BLDC motor commutation in HVAC blowers and industrial pumps. IC Role / Device Role / Timing Role: Analog field sensor feeding ADC in motor control MCU to determine rotor angle for sinusoidal drive. Use Value: Rail-to-rail output maximizes ADC utilization; dynamic offset cancellation prevents zero-drift during thermal transients in enclosed motor housings.

Throttle Position Sensing

Brake Pedal Position Sensing

Use Scenario: Non-contact measurement of throttle plate angle in gasoline/diesel engine management systems.

IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet displacement on rotating shaft.

Use Value: 2.5 mV/G sensitivity and ±1.5% linearity ensure <0.5° angular resolution; ratiometric output rejects 5 V rail noise common in engine bays.

Use Scenario: Detection of brake pedal travel in hydraulic or electro-hydraulic braking systems.

IC Role / Device Role / Timing Role: Analog magnetic field transducer converting linear magnet motion into calibrated voltage output.

Use Value: Stable quiescent voltage (2.5 V ±0.075 V) enables zero-point calibration at system power-up; 30 kHz bandwidth supports fast pedal release detection.

Industrial Valve Position Feedback

Motor Commutation Monitoring

Use Scenario: Closed-loop position control of pneumatic/hydraulic valves in factory automation and process control.

IC Role / Device Role / Timing Role: High-reliability linear sensor interfacing with PLC analog inputs for real-time valve stem monitoring.

Use Value: –40°C to +85°C operating range and solid-state construction eliminate potentiometer wear; 20 mV_PP noise allows sub-1% full-scale error without averaging.

Use Scenario: Rotor position detection for BLDC motor commutation in HVAC blowers and industrial pumps.

IC Role / Device Role / Timing Role: Analog field sensor feeding ADC in motor control MCU to determine rotor angle for sinusoidal drive.

Use Value: Rail-to-rail output maximizes ADC utilization; dynamic offset cancellation prevents zero-drift during thermal transients in enclosed motor housings.

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
A1326LLHLX-T	Same LH package, higher temp grade (–40°C to +150°C), 2.5 mV/G sensitivity, discontinued replacement per Allegro notice	Required for new designs targeting >85°C ambient; not drop-in due to different temperature qualification and lifecycle status	Select when extended temperature range and current production availability are mandatory; verify PCB layout compatibility with LLHLX marking
A1323LUA-T	Same sensitivity (2.5 mV/G) and electrical specs, but 3-pin SIP through-hole package (UA), –40°C to +85°C rating	Used where manual assembly or prototyping on breadboard/perfboard is needed; lacks surface-mount thermal performance	Choose for legacy board rework or low-volume hand-soldered builds; avoid for high-vibration or automated SMT lines

Compared with A1323ELHLT, A1326LLHLX-T extends ambient range to +150°C and remains in production, while A1323LUA-T offers identical sensitivity in a through-hole form factor-neither is pin-compatible, requiring layout changes, but both maintain the same analog interface behavior and calibration curve.

Availability

A1323ELHLT is available at Aetrix Electronics and suitable for throttle position sensing, brake pedal monitoring, industrial valve feedback, and motor commutation applications requiring stable component supply despite its discontinued status.

Supply support for A1323ELHLT 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 since 1989.

The A132X family was designed for high-temperature, high-reliability linear and rotary position sensing in automotive powertrain and industrial actuation systems.

FAQ

What is the operating temperature range for the A1323ELHLT?

The A1323ELHLT is rated for ambient temperatures from –40°C to +85°C. Its junction temperature can reach up to 165°C, and thermal resistance is 228°C/W on a 1-layer PCB or 110°C/W on a 2-layer PCB with thermal vias-enabling reliable operation within this ambient range when properly heatsinked.

Is the A1323ELHLT still in production?

No-the A1323ELHLT is a discontinued product per Allegro's official documentation dated October 31, 2011. It is not recommended for new designs, and samples are no longer available. Aetrix Electronics provides remaining inventory with full traceability and lifecycle coordination support.

What does "ratiometric" mean for the A1323ELHLT output?

For the A1323ELHLT, ratiometric means both its quiescent output voltage (2.5 V nominal) and sensitivity (2.5 mV/G) scale proportionally with supply voltage (V_CC). This ensures output accuracy remains stable even if V_CC varies between 4.5 V and 5.5 V, eliminating need for separate voltage references in noisy 5 V systems.

Can the A1323ELHLT replace the A1323LUA-T in an existing design?

The A1323ELHLT and A1323LUA-T share identical electrical specifications and sensitivity (2.5 mV/G), but differ in package: SOT-23W (surface mount) vs. SIP (through-hole). Mechanical replacement requires PCB redesign; however, calibration, signal chain, and firmware remain fully compatible due to identical analog behavior.

What is the maximum load capacitance supported by the A1323ELHLT output?

The A1323ELHLT output is specified to drive up to 10 nF of capacitive load (V_OUT to GND) while maintaining stability and bandwidth. Exceeding this value may cause ringing or reduced slew rate; a series resistor is recommended if driving long traces or high-capacitance ADC inputs.

A1323ELHLT 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

A1323ELHLT FAQ

1.How can I place an order for A1323ELHLT through Aetrix?

Please submit a Request for Quotation (RFQ) for A1323ELHLT 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 A1323ELHLT reliable?

The price and inventory of A1323ELHLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1323ELHLT is usually 5 days.

3.What payment methods are accepted for A1323ELHLT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1323ELHLT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1323ELHLT?

A1323ELHLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1323ELHLT 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 A1323ELHLT?

For technical support, including A1323ELHLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1323ELHLT requirements.

6.How does Aetrix verify that A1323ELHLT is sourced from the original manufacturer or authorized distributors?

All A1323ELHLT 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 A1323ELHLT meets industry standards.

7.What is the process for return or replacement of A1323ELHLT?

All A1323ELHLT units undergo pre-shipment inspection (PSI). If there is an issue with A1323ELHLT, 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 A1323ELHLT part is unused and in its original packaging.

Return procedure for A1323ELHLT:

1.Submit a request within 90 days.

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

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