A3966ELBTR-T

Overview

The A3966ELBTR-T is a dual full-bridge PWM motor driver manufactured by Allegro MicroSystems. It is designed to drive both windings of a two-phase bipolar stepper motor, featuring two full-bridges capable of continuous output currents of ±650 mA and operating voltages up to 30 V. The device incorporates internal fixed-frequency pulse-width modulated current-control circuitry for precise motor winding current regulation. Key electrical parameters include a supply voltage range of 4.75 V to 5.5 V, a load voltage rating of 30 V, and a maximum power dissipation of 1.87 W. It operates within a junction temperature range of -20°C to 150°C and utilizes a 16-SOIC surface-mount package.

Feature Summary

• Integrates two full-bridge drivers with internal fixed-frequency PWM current control for precise bipolar stepper motor operation
• Includes built-in Satlington sink drivers, internal ground-clamp and flyback diodes, and crossover-current protection
• Features user-selectable blanking windows and thermal-shutdown circuitry for enhanced system reliability

Applications

• Two-phase bipolar stepper motor control
• General-purpose motion control systems
• Industrial automation actuators

Procurement Notes

Verify the specific suffix 'EL' against official Allegro documentation to confirm exact ordering information, as standard listings often reference 'SL'. Ensure compatibility with required packaging formats such as cut tape or reel. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into production workflows.

Selection Notes

Select this component when driving bipolar stepper motors requiring up to ±650 mA continuous current. It is suitable for applications needing integrated current regulation via PWM without external complex circuitry. Consider the 16-SOIC package for surface-mount assembly constraints and verify that the 30 V voltage rating aligns with motor specifications.

Part Context

The A3966 series belongs to Allegro MicroSystems' portfolio of highly integrated mixed-signal ICs for motor control. These products are designed to reduce component count and simplify design-in processes for motion control applications. The series supports various packaging options to accommodate different manufacturing needs while maintaining robust performance in automotive and industrial environments.

Replacement Considerations

A3966SLBTR-T

FAQ

How is the peak load current limit determined?

The peak load current limit is set by the user selection of a reference voltage and current-sensing resistors.

What protection features are included?

The device includes internal thermal-shutdown circuitry, crossover-current protection, and UVLO (Under-Voltage Lock-Out) protection.