A3966SLB-T

Overview

The A3966SLB-T is a dual full-bridge PWM motor driver designed for bipolar stepper motors. It integrates control logic and power stages to drive two windings with continuous output currents of ±650 mA at operating voltages up to 30 V. The device features internal fixed-frequency pulse-width modulated current control, Satlington sink drivers, and user-selectable blanking windows. Protection mechanisms include thermal shutdown, crossover-current protection, and UVLO. It operates within a junction temperature range of -20°C to +150°C and is housed in a 16-SOIC package.

Feature Summary

• Integrates dual full-bridges for driving bipolar stepper motor windings
• Includes internal fixed-frequency PWM current-control circuitry
• Provides comprehensive protection via thermal shutdown and UVLO

Applications

• Bipolar stepper motor control systems
• General-purpose motion control applications
• Automated equipment requiring integrated motor driving

Procurement Notes

Verify the specific suffix against official Allegro MicroSystems documentation to confirm pinout compatibility and electrical specifications. Ensure the ordering code matches the required tape-and-reel or cut-tape configuration. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and current production status before procurement.

Selection Notes

Select this component for applications requiring an integrated solution for bipolar stepper motors without external discrete power transistors. Consider the ±650 mA continuous current rating and 30 V voltage limit when sizing the load. Evaluate the thermal performance requirements given the SOIC package and internal power dissipation characteristics under expected operating conditions.

Part Context

This part belongs to the A3966 series from Allegro MicroSystems, which focuses on dual full-bridge motor drivers. The series provides complete drive solutions for bipolar stepper motors, combining logic and power stages in a single IC to simplify system design and reduce component count compared to discrete implementations.

Replacement Considerations

Official substitutes within the same family include A3966SA and A3966SLB. Verify functional equivalence and pin compatibility before substitution.