A3938SLD

Overview

The A3938SLD is a motor driver integrated circuit manufactured by Allegro MicroSystems, designed for driving three-phase brushless DC (BLDC) motors. It utilizes power MOSFET technology and features a parallel interface with PWM control capabilities. The device operates within a supply voltage range of 18V to 50V and supports an ambient operating temperature from -20°C to 85°C. It is housed in a 38-TSSOP package, specifically identified as a 38-TFSOP with a width of 0.173 inches (4.40mm). The output configuration consists of pre-drivers for three half-bridges.

Feature Summary

• Integrated controller providing commutation and direction management for BLDC motors
• Supports parallel and PWM interfaces for motor speed and torque control
• Includes internal circuit protection mechanisms such as thermal shutdown and undervoltage lockout

Applications

• Three-phase brushless DC motor control systems
• Industrial automation equipment requiring precise motor direction management
• General-purpose motor driver applications compatible with 18V-50V power supplies

Procurement Notes

Verify the specific suffix 'SLD' against current manufacturer documentation to confirm package type and RoHS compliance status, as legacy variants may differ. Confirm availability through authorized distributors, noting that this part number may be subject to end-of-life status or replacement by newer equivalents like the A3938SLDTR-T. Ensure compatibility with existing PCB footprints for the 38-TSSOP package before procurement.

Selection Notes

Select this component when a robust solution for three-phase BLDC motor control is required within the 18V to 50V operating range. The 38-TSSOP package is suitable for surface-mount assembly where space constraints allow for its dimensions. Consider the operational temperature range of -20°C to 85°C to ensure suitability for the intended environmental conditions. Verify that the parallel/PWM interface aligns with the system's control logic requirements.

Part Context

The A3938 series represents a family of motor drivers from Allegro MicroSystems designed for high-performance BLDC applications. The A3938SLD is a specific variant within this lineup, distinguished by its 38-TSSOP packaging and specific electrical characteristics tailored for industrial and general-purpose motor control. It shares functional similarities with other members of the A3938 family but differs in physical package and potentially in manufacturing lot specifications.

Replacement Considerations

The A3938SLDTR-T is documented as a parameter-equivalent substitute. Verify pin-to-pin compatibility and package dimensions before substitution.