Allegro MicroSystems A1442EEWLT-P

Overview

A1442EEWLT-P from Allegro MicroSystems is a discontinued low-voltage full-bridge brushless DC motor driver with integrated Hall element, soft-switching control, and reverse-battery protection. It delivers ±400 mA peak output current, operates from 2.0–4.2 V supply, and features thermal shutdown, short-circuit protection, and micropower sleep mode (≤10 µA). Designed for unidirectional vibration motors in portable electronics including cellular phones and electronic toothbrushes.

For engineers reviewing the A1442EEWLT-P datasheet, A1442EEWLT-P pinout, A1442EEWLT-P application, or A1442EEWLT-P equivalent, key selection considerations include its 6-pin MLP/DFN package (1.5 × 2 mm), Hall-based commutation without external sensors, integrated antistall algorithm, and absence of required external diodes for reverse-battery protection.

Technical Context

The A1442EEWLT-P integrates a Hall chopper sensor, drive logic, soft-switching control, active braking, stall detection, and a full H-bridge (Q1–Q4) on a single CMOS die. Its operation relies on magnetic field polarity detection (BOP = 35–75 G, BRP = –75 to –35 G) to determine output polarity and commutation timing.

It implements a micropower sleep mode controlled via the SLEEP pin (VINHI = 0.7×VDD, VINLO = 0.2×VDD), reducing supply current to ≤10 µA. Reverse-battery protection operates down to –4.2 V on both VDD and SLEEP pins, with integrated thermal shutdown activating at TJ ≥ 165 °C.

Key Specifications

Pinout & Package

Package: 6-pin MLP/DFN (1.5 mm × 2.0 mm, 0.40 mm max height) with exposed thermal pad for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-bridge BLDC motor driver applications.

Compared with A1442EEWLT-P, the A4950ELJTR-T supports higher voltage but adds system complexity with external Hall interface, while the DRV8833CPWPR offers lower sleep current but removes integrated safety and commutation-making A1442EEWLT-P uniquely suited for cost-optimized, single-chip vibration motor solutions.

Availability

A1442EEWLT-P is available at Aetrix Electronics and suitable for cellular phone vibration motor control, electronic toothbrush actuation, and handheld game controller haptics requiring stable component supply despite end-of-life status.

Supply support for A1442EEWLT-P 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 designer of high-performance magnetic sensing and power ICs, headquartered in Worcester, Massachusetts.

The A1442 product line was developed specifically for ultra-compact, low-voltage brushless DC motor control in portable consumer electronics-emphasizing integration, protection, and acoustic performance.

FAQ

Is the A1442EEWLT-P still in production?

No, the A1442EEWLT-P is a discontinued product. Allegro MicroSystems ceased production as of March 4, 2013. It is not recommended for new designs, and samples are no longer available. Aetrix Electronics maintains limited legacy stock for existing production continuity, subject to availability verification prior to order placement.

What is the function of the NC pin on the A1442EEWLT-P?

The NC (No Connection) pin on the A1442EEWLT-P is internally unconnected and must remain unbonded. Per Allegro's package drawing DWG-2856, it may be left floating or tied to GND in PCB layout-no electrical function is assigned. This pin does not affect operation or thermal performance of the A1442EEWLT-P.

Does the A1442EEWLT-P require an external bypass capacitor?

Yes, the A1442EEWLT-P requires a 0.1 µF ceramic bypass capacitor between VDD and GND, placed as close as possible to the pins. This is mandatory for stable operation across the full 2.0–4.2 V supply range and is explicitly specified in the Operating Characteristics section of the A1442EEWLT-P datasheet.

Can the A1442EEWLT-P drive bidirectional motors?

No, the A1442EEWLT-P operates exclusively in unidirectional working mode. Its internal commutation logic and Hall signal processing are fixed to produce rotation in one direction only. Bidirectional control requires external circuitry or a different driver such as the DRV8833CPWPR-not supported by the A1442EEWLT-P architecture.

What is the purpose of the exposed thermal pad on the A1442EEWLT-P package?

The exposed thermal pad on the A1442EEWLT-P's MLP/DFN package serves as the primary thermal conduction path from the die to the PCB. It must be soldered to a thermally robust copper area-ideally with multiple thermal vias-to maintain junction temperature below 165 °C under load. This pad is electrically connected to GND and is essential for reliable operation at peak output current.