Allegro MicroSystems A1304ELHLX-05-T

Overview

A1304ELHLX-05-T from Allegro MicroSystems is a linear Hall-effect sensor IC designed for medium-accuracy position and proximity sensing in space-constrained applications. It delivers 0.5 mV/G sensitivity, ±3000 G magnetic field range, and ratiometric analog output referenced to a 3.3 V supply, with quiescent output voltage of 1.65 V and ±40 mV temperature drift over –40°C to 85°C.

For engineers reviewing the A1304ELHLX-05-T datasheet, A1304ELHLX-05-T pinout, A1304ELHLX-05-T application, or A1304ELHLX-05-T equivalent, this device supports high-bandwidth (20 kHz) analog sensing with low-noise performance (4.6 mG/√Hz input-referred RMS noise), dynamic offset cancellation, and immunity to mechanical stress - critical for automotive throttle position, industrial valve monitoring, and precision current sensing circuits.

Technical Context

The A1304ELHLX-05-T integrates a BiCMOS monolithic circuit featuring a Hall element, on-chip offset and sensitivity trim, high-gain amplifier, and proprietary chopper-stabilized architecture that suppresses thermal and mechanical drift. Its dynamic offset cancellation operates via high-frequency modulation-demodulation, separating magnetic signal from DC offset in the frequency domain.

This architecture enables precise recoverability after temperature cycling, ±1.5% linearity error over ±2250 G, and stable ratiometric behavior - where both quiescent output (±1.5% ratiometry error) and sensitivity (±1.5% ratiometry error) scale linearly with supply voltage across 3.0–3.6 V.

Key Specifications

Pinout & Package

The A1304ELHLX-05-T is housed in a lead-free 3-pin SOT-23W (LH) surface-mount package with 0.95 mm × 1.91 mm footprint, 0.41 mm nominal thickness, and 100% matte tin leadframe plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Hall-effect sensor applications.

Compared with A1304ELHLX-05-T, the A1324LLHLT-T offers higher sensitivity but narrower magnetic range and different supply tolerance, while the MLX90242ESE-GAA-000-RE provides tri-axis capability at the cost of size and complexity - making A1304ELHLX-05-T optimal for single-axis, high-range, space-constrained analog sensing.

Availability

A1304ELHLX-05-T is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial linear actuator feedback, and brushless DC motor commutation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for A1304ELHLX-05-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, industrial, and consumer markets.

The A1304 product line delivers miniature, temperature-stable linear Hall-effect sensors for analog position, speed, and current sensing - engineered for reliability in harsh environments and ease of integration into compact PCB layouts.

FAQ

What is the operating supply voltage range for the A1304ELHLX-05-T?

The A1304ELHLX-05-T operates from 3.0 V to 3.6 V, with undervoltage lockout (UVLO) ensuring output remains disabled below ~2.6 V. This narrow range optimizes performance for 3.3 V systems and minimizes supply-related ratiometric error, which is specified at ±1.5% for both quiescent output and sensitivity across the full operating voltage window.

How does the A1304ELHLX-05-T achieve temperature stability in its output?

The A1304ELHLX-05-T achieves temperature stability through integrated dynamic offset cancellation and factory-trimmed sensitivity, limiting quiescent voltage output drift to ±40 mV over –40°C to 85°C and sensitivity temperature coefficient to 0.04–0.2 %/°C. Its chopper-stabilized BiCMOS architecture actively suppresses thermal and mechanical stress-induced offsets, enabling precise recoverability after temperature cycling.

What is the maximum magnetic field the A1304ELHLX-05-T can measure linearly?

The A1304ELHLX-05-T maintains linearity over a ±3000 G magnetic field range, defined by its 0.5 mV/G sensitivity and saturation limits (VSAT(HIGH) = 2.87 V, VSAT(LOW) = 0.38 V at 25°C). Within this range, linearity error is guaranteed at ±1.5%, supporting high-amplitude sensing applications such as large-stroke linear actuators and high-current busbar monitoring.

Can the A1304ELHLX-05-T be used with supply voltages other than 3.3 V?

Yes - the A1304ELHLX-05-T is ratiometric: its quiescent output and sensitivity scale proportionally with VCC between 3.0 V and 3.6 V. At 3.0 V, QVO drops to ~1.5 V and sensitivity to ~0.45 mV/G; at 3.6 V, QVO rises to ~1.8 V and sensitivity to ~0.54 mV/G. Ratiometry error remains within ±1.5%, preserving measurement accuracy without recalibration.

What decoupling capacitor value is recommended for the A1304ELHLX-05-T VCC pin?

A minimum 0.1 µF ceramic capacitor is required between VCC and GND, placed as close as possible to the A1304ELHLX-05-T pins. This value satisfies the device's internal regulator and dynamic offset cancellation circuitry, ensuring stable operation and minimizing noise coupling. Larger values (e.g., 1 µF) may be added in parallel for enhanced low-frequency supply filtering, but the 0.1 µF capacitor must remain present and localized.