Allegro MicroSystems A1315LUA-5-T

Overview

A1315LUA-5-T from Allegro MicroSystems is a linear Hall-effect sensor IC with analog output, designed for high-accuracy displacement and angular position sensing in automotive and industrial systems. It delivers 5 mV/G sensitivity, ratiometric 1.65 V quiescent output at 3.3 V supply, and operates across –40°C to 150°C. Its 3-pin ultramini SIP package enables robust through-hole mounting in space-constrained motor control and throttle position applications.

For engineers reviewing the A1315LUA-5-T datasheet, A1315LUA-5-T pinout, A1315LUA-5-T application, or A1315LUA-5-T equivalent, key selection criteria include its programmed QVO temperature coefficient, ±1.5% linearity error, 20 kHz bandwidth, clamped output diagnostics, and compatibility with 3.3 V supply rails in harsh-temperature environments.

Technical Context

The A1315LUA-5-T integrates a BiCMOS monolithic circuit featuring a Hall element, dynamic offset cancellation, and a high-speed 400 kHz chopping scheme that minimizes QVO drift. Its sensitivity and QVO temperature coefficients are individually programmed at end-of-line test to ensure stability across –40°C to 150°C.

It implements ratiometric operation: output voltage, sensitivity, and clamp levels scale proportionally with VCC. The device includes undervoltage lockout (UVLO) with 2.5 V turn-off and 3 V turn-on thresholds, plus output clamps enabling short-circuit diagnostics without external components.

Key Specifications

Pinout & Package

The A1315LUA-5-T uses a 3-pin ultramini single inline package (SIP), 1.5 mm × 4 mm × 3 mm, optimized for through-hole mounting and mechanical stress immunity. Leadframe is 100% matte-tin plated, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1315LUA-5-T, the A1324LLHLT-5-T offers identical sensitivity in a smaller footprint but reduced mechanical ruggedness, while the MLX90242 requires external support circuitry for fault detection and lacks the same level of integrated thermal stability and analog output simplicity.

Availability

A1315LUA-5-T is available at Aetrix Electronics and suitable for automotive throttle sensing, industrial valve position monitoring, BLDC motor commutation, and brake pedal feedback systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for A1315LUA-5-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 and power ICs, with design centers in North America, Europe, and Asia.

The A1315 product line targets high-accuracy linear position sensing in automotive and industrial applications, emphasizing temperature stability, mechanical stress immunity, and integrated diagnostics for functional safety–aware systems.

FAQ

What is the operating supply voltage range for the A1315LUA-5-T?

The A1315LUA-5-T operates from 3.0 V to 3.63 V, with nominal performance specified at 3.3 V. It features undervoltage lockout (UVLO) that disables output below 2.5 V and re-enables it above 3.0 V, ensuring clean startup and shutdown behavior in automotive battery environments where voltage fluctuates during cranking.

How does the A1315LUA-5-T achieve stable quiescent output across temperature?

The A1315LUA-5-T achieves stable quiescent output via end-of-line programming of both QVO and its temperature coefficient. Each A1315LUA-5-T unit has its QVO and QVO TC individually tuned at Allegro's test facility, resulting in a typical QVO drift of only –15 mV to +15 mV across –40°C to 150°C - critical for zero-point repeatability in position feedback loops.

What is the purpose of the output voltage clamps in the A1315LUA-5-T?

The A1315LUA-5-T's output clamps (0.33 V low, 2.97 V high at 3.3 V supply) serve dual purposes: they limit the effective magnetic sensing range to ±400 G for predictable linearity, and they provide immediate electrical fault indication - e.g., a stuck-low output signals a short-to-ground, while a stuck-high output indicates a short-to-VCC, enabling hardware-level diagnostics without MCU intervention.

Can the A1315LUA-5-T be used with a 5 V supply?

No, the A1315LUA-5-T is rated for absolute maximum VCC of 8 V but is characterized and optimized exclusively for 3.3 V operation. Its internal circuitry, including UVLO thresholds, sensitivity calibration, and clamp voltages, is ratiometric to 3.3 V. Using 5 V risks exceeding electrical specifications and invalidates all published performance parameters - Allegro does not guarantee operation outside the 3.0–3.63 V range.

What packaging format does the A1315LUA-5-T use, and why is it significant?

The A1315LUA-5-T uses a 3-pin ultramini SIP (single inline package), 1.5 mm × 4 mm × 3 mm, designed for through-hole mounting. This package provides superior mechanical robustness and vibration resistance compared to surface-mount alternatives, making it ideal for under-hood automotive sensors and industrial actuators where solder joint integrity and stress immunity are critical - confirmed by its "immune to mechanical stress" qualification in the datasheet.