Allegro MicroSystems A1389LUATN-9-T

Overview

A1389LUATN-9-T from Allegro MicroSystems is a linear Hall-effect sensor IC designed for high-accuracy angular and displacement sensing in automotive and industrial systems. It delivers 9 mV/G sensitivity, ratiometric analog output centered at 2.5 V (50% of 5 V supply), and operates across –40°C to 150°C. Its integrated dynamic offset cancellation, programmable QVO temperature coefficient, and output clamps enable robust magnetic field measurement in harsh environments.

For engineers reviewing the A1389LUATN-9-T datasheet, A1389LUATN-9-T pinout, A1389LUATN-9-T application, or A1389LUATN-9-T equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for position-sensing designs requiring thermal stability, low noise, and short-circuit diagnostics.

Technical Context

The A1389LUATN-9-T integrates a BiCMOS monolithic circuit with a Hall element, high-gain amplifier, tuned filter, and proprietary chopping-based dynamic offset cancellation. Its sensitivity and quiescent voltage output (QVO) are factory-programmed with temperature coefficients to maintain accuracy over –40°C to 150°C.

It employs a 400 kHz chopping frequency to suppress DC offset drift and mechanical stress effects, while its ratiometric architecture ensures output scaling with supply voltage. Output clamps (0.40–0.70 V low, 4.35–4.65 V high) provide built-in short-circuit diagnostics and define usable magnetic range.

Key Specifications

Pinout & Package

Package: 3-pin ultramini single inline package (SIP), UA variant - lead-free, 100% matte-tin leadframe plating, 1.5 mm × 4 mm × 3 mm body, through-hole mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1389LUATN-9-T, A1389LLHLX-9-T offers identical sensing performance in a smaller SMT package but lacks through-hole mechanical robustness, while TLE4998P-9U shifts from analog simplicity to digital intelligence-enabling advanced diagnostics at the cost of added firmware complexity and interface overhead.

Availability

A1389LUATN-9-T is available at Aetrix Electronics and suitable for automotive steering angle sensing, industrial motor commutation, and brake pedal position monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for A1389LUATN-9-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 and industrial markets.

The A1388/A1389 family was developed to deliver high-accuracy, thermally stable linear Hall sensing in miniature packages for next-generation displacement and angular position feedback in safety-critical systems.

FAQ

What is the supply voltage range for the A1389LUATN-9-T?

The A1389LUATN-9-T operates from 4.5 V to 5.5 V with undervoltage lockout (UVLO) that disables output below 2.5 V and re-enables it above 3 V. This ensures clean startup and shutdown behavior in noisy 5 V systems, such as automotive battery rails subject to cranking dips. The device draws 9–11.5 mA typical supply current at 5 V.

How does the A1389LUATN-9-T achieve thermal stability across –40°C to 150°C?

The A1389LUATN-9-T achieves thermal stability via factory-programmed temperature coefficients for both sensitivity (0.08–0.16 %/°C) and quiescent voltage output (QVO), combined with a 400 kHz chopping architecture that cancels offset drift from thermal and mechanical stress. These features ensure QVO drift remains within ±20 mV and sensitivity drift within ±2% across the full range.

What is the purpose of the output voltage clamps on the A1389LUATN-9-T?

The A1389LUATN-9-T's output clamps (0.40–0.70 V low, 4.35–4.65 V high) serve dual purposes: they limit the linear magnetic operating range to prevent saturation, and they provide immediate short-circuit fault detection-e.g., if VOUT is pulled low externally, the clamp holds at ~0.55 V, signaling a wiring fault to the host controller without additional circuitry.

Can the A1389LUATN-9-T be used in safety-critical automotive applications?

Yes-the A1389LUATN-9-T is qualified for automotive use with AEC-Q100 Grade 0 (–40°C to +150°C), enhanced EMC performance per ISO 11452-2, and proven reliability in thermal cycling and mechanical stress tests. Its precise QVO recoverability, ratiometric design, and output clamps support ASIL-B–capable system architectures when paired with redundancy and diagnostics.

What is the difference between A1389LUATN-9-T and A1389LLHLX-9-T?

The A1389LUATN-9-T uses a 3-pin ultramini SIP (UA) through-hole package (1.5 mm × 4 mm), while A1389LLHLX-9-T uses a 3-pin SOT-23W surface-mount package (2 mm × 3 mm). Both share identical electrical specifications-including 9 mV/G sensitivity, 2.5 V QVO, and –40°C to 150°C operation-but differ in mounting method, thermal resistance (165 °C/W vs. 110 °C/W on 2-layer PCB), and assembly process compatibility.