Allegro MicroSystems A1315LUATN-2-T

Overview

A1315LUATN-2-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 2.5 mV/G sensitivity, ratiometric analog output centered at 50% of 3.3 V supply, and operates across –40°C to 150°C. Its integrated dynamic offset cancellation and factory-programmed temperature coefficients ensure stable quiescent voltage output (QVO) and sensitivity over temperature.

For engineers reviewing the A1315LUATN-2-T datasheet, A1315LUATN-2-T pinout, A1315LUATN-2-T application, or A1315LUATN-2-T equivalent, key selection criteria include its 3-pin SIP through-hole package, ±1.5% linearity error, 20 kHz bandwidth, UVLO protection, and clamped output for short-circuit diagnostics in harsh environments.

Technical Context

The A1315LUATN-2-T integrates a BiCMOS monolithic circuit with Hall element, high-gain amplifier, clamped low-impedance output stage, and proprietary chopping-based dynamic offset cancellation. Its sensitivity and QVO temperature coefficients are programmed at end-of-line test at 150°C relative to 25°C baseline.

This device implements a 400 kHz chopper stabilization scheme to suppress thermal and mechanical stress-induced drift, enabling precise recoverability after temperature cycling and maintaining <±13 mV QVO drift across –40°C to 150°C.

Key Specifications

Pinout & Package

Package: 3-pin ultramini SIP (UA), through-hole, 1.5 mm × 4 mm × 3 mm, lead-free with 100% matte-tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1315LUATN-2-T, the MLX90242 offers digital configurability but adds interface complexity and removes analog fault signaling, while the A1324LLHLT-2-T matches electrical performance but trades UA's through-hole robustness and thermal margin for smaller footprint.

Availability

A1315LUATN-2-T is available at Aetrix Electronics and suitable for automotive steering systems, industrial motor controls, brake-by-wire modules, and HVAC actuator designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for A1315LUATN-2-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 for automotive and industrial markets.

The A1315 product line was developed to deliver high-accuracy, temperature-stable linear Hall sensing in miniature packages for next-generation position feedback in safety-critical motion control systems.

FAQ

What is the operating supply voltage range for the A1315LUATN-2-T?

The A1315LUATN-2-T operates from 3.0 V to 3.63 V, with nominal 3.3 V supply. Its undervoltage lockout activates below 2.5 V (VUVLOLO) and re-enables above 3.0 V (VUVLOHI), ensuring clean startup and shutdown behavior. This range aligns with common automotive and industrial 3.3 V power domains and maintains ratiometric output scaling across the full window.

How does the A1315LUATN-2-T achieve stable quiescent voltage output over temperature?

The A1315LUATN-2-T achieves stable quiescent voltage output (QVO) through two complementary techniques: factory programming of QVO temperature coefficient at Allegro's end-of-line test, and a 400 kHz chopping architecture that dynamically cancels thermal and mechanical offset drift. As confirmed in the datasheet, QVO drift is limited to ±13 mV across –40°C to 150°C, enabling reliable zero-field referencing in demanding environments.

Is the A1315LUATN-2-T pin-compatible with other A1315 variants?

Yes - all A1315 variants in the UA package, including A1315LUA-2-T and A1315LUATN-5-T, share identical 3-pin SIP pinout (VCC–GND–VOUT). The A1315LUATN-2-T differs only in packing (4,000/reel) and marking suffix, not electrical or mechanical interface. This allows direct substitution within the same package family without layout changes.

What is the maximum magnetic field range supported by the A1315LUATN-2-T?

The A1315LUATN-2-T supports a linear magnetic field range determined by its output clamps and sensitivity: |BMAX(+)| ≈ (2.97 V − 1.65 V) / 2.5 mV/G = ±528 G, and |BMAX(–)| ≈ (1.65 V − 0.33 V) / 2.5 mV/G = ±528 G. This ±528 G range is valid at 3.3 V supply and 25°C; it scales ratiometrically with VCC and is constrained by ±1.5% linearity error specification.

Does the A1315LUATN-2-T require an external bypass capacitor?

Yes - the A1315LUATN-2-T requires a 0.1 µF ceramic bypass capacitor between VCC and GND, placed as close as possible to the package pins. This capacitor stabilizes the internal regulator, ensures proper UVLO hysteresis, reduces supply noise coupling into the analog signal path, and is explicitly mandated in the "Typical Application Circuit" (Figure 5) and Electrical Characteristics section of the datasheet.