Allegro MicroSystems A1388LUA-2-T

Overview

A1388LUA-2-T from Allegro MicroSystems is a linear Hall-effect sensor IC with analog voltage output, designed for high-accuracy displacement and angular position sensing in constrained spaces. It delivers 2.5 mV/G sensitivity, ±1.5% linearity error, and operates from 4.5–5.5 V supply across –40°C to 150°C - enabling use in automotive throttle position and industrial rotary encoder systems.

For engineers reviewing the A1388LUA-2-T datasheet, A1388LUA-2-T pinout, A1388LUA-2-T application, or A1388LUA-2-T equivalent, key selection criteria include its programmed QVO temperature coefficient (±10 mV drift over full range), 20 kHz bandwidth, ratiometric output scaling with V_CC, and SIP package compatibility with through-hole assembly and thermal stress immunity.

Technical Context

The A1388LUA-2-T integrates a BiCMOS monolithic circuit featuring a Hall element, dynamic offset cancellation via high-speed chopping at 400 kHz, and temperature-compensating circuitry that reduces intrinsic sensitivity drift. Its quiescent output (2.5 V at 5 V supply) is factory-programmed with optimized sensitivity and QVO temperature coefficients.

This device implements ratiometric operation: V_OUT(Q), sensitivity, and clamp voltages all scale proportionally with V_CC. Output clamps (0.40–0.70 V low / 4.35–4.65 V high) provide short-circuit diagnostics, while undervoltage lockout (2.5 V turn-off / 3 V turn-on) ensures clean power sequencing.

Key Specifications

Pinout & Package

Package: 3-pin ultramini SIP (1.5 mm × 4 mm × 3 mm), lead-free with 100% matte-tin plating, 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 A1388LUA-2-T, the A1388LLHLX-2-T offers identical electrical specs but differs in mounting and thermal performance, while the TLV493D-A1B6 replaces analog simplicity with digital flexibility and 3D capability - neither is pin-compatible, and both require layout and firmware changes.

Availability

A1388LUA-2-T is available at Aetrix Electronics and suitable for automotive throttle position sensing, industrial rotary encoder interfaces, and electric power steering torque monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for A1388LUA-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, with over 40 years of innovation in Hall-effect technology and automotive-grade reliability.

The A1388 product line targets high-accuracy linear position sensing in harsh environments, emphasizing factory-programmed temperature stability, mechanical stress immunity, and drop-in readiness for automotive and industrial motion control systems.

FAQ

What is the operating supply voltage range for the A1388LUA-2-T?

The A1388LUA-2-T operates from 4.5 V to 5.5 V, with undervoltage lockout engaging below 2.5 V (turn-off) and re-enabling above 3 V (turn-on). This 5 V nominal range ensures compatibility with standard automotive and industrial logic rails while maintaining ratiometric output scaling and stable quiescent voltage at 2.5 V.

How does the A1388LUA-2-T achieve temperature stability in its output?

The A1388LUA-2-T achieves temperature stability through factory-programmed sensitivity and quiescent voltage output (QVO) temperature coefficients, combined with a 400 kHz chopping scheme that dynamically cancels offset drift. As a result, QVO drift is limited to –10 mV to +10 mV across –40°C to 150°C, and sensitivity hysteresis remains within ±2% after thermal cycling - both confirmed in the A1388LUA-2-T datasheet.

What package type is used by the A1388LUA-2-T, and what are its key mechanical dimensions?

The A1388LUA-2-T uses a 3-pin ultramini SIP (single inline package) with dimensions 1.5 mm × 4 mm × 3 mm and 0.50 mm active area depth. It is lead-free with 100% matte-tin leadframe plating, designed for through-hole mounting and optimized for thermal performance (165°C/W on 1-layer PCB).

Does the A1388LUA-2-T include built-in diagnostics or protection features?

Yes, the A1388LUA-2-T includes output voltage clamps (0.40–0.70 V low / 4.35–4.65 V high) for short-circuit detection, undervoltage lockout (UVLO) with hysteresis, and a 0.1 µF bypass capacitor requirement on VCC for noise immunity. These features enable fault identification without external components and ensure robust operation in electrically noisy environments.

Can the A1388LUA-2-T be used in safety-critical automotive applications?

The A1388LUA-2-T is qualified for automotive under-hood use (–40°C to 150°C), features enhanced EMC performance, and includes diagnostic clamps and UVLO - however, Allegro explicitly states its products are not intended for life-support devices or systems where failure could cause bodily harm. For ASIL-B/C applications, system-level validation and redundancy design remain the responsibility of the end customer.