A3966SA

Overview

The A3966SA is a discontinued dual full-bridge PWM motor driver IC manufactured by Allegro MicroSystems. Designed for bipolar stepper motors, it integrates control and power stages in a 16-DIP package. It supports a supply voltage range of 4.75V to 5.5V and handles load voltages from 4.75V to 30V. The device delivers a continuous output current of 650mA per channel. Operating junction temperature ranges from -20°C to 150°C. It features internal thermal shutdown, crossover-current protection, and UVLO.

Feature Summary

• Integrates two full-bridges with fixed-frequency PWM current control circuitry
• Includes Satlington sink drivers with internal ground-clamp and flyback diodes
• Provides user-selectable blanking window for noise immunity
• Features comprehensive protection including thermal shutdown and overcurrent detection

Applications

• Bipolar stepper motor control systems
• Low-voltage industrial automation equipment
• Office automation devices requiring integrated motor drive solutions

Procurement Notes

Verify component authenticity carefully as the A3966SA is officially obsolete. Confirm package integrity and pin alignment against original Allegro specifications. Check for RoHS compliance status if required by specific regulatory frameworks. Ensure replacement parts match electrical parameters and pinout configurations before integration into existing designs.

Selection Notes

Select this component only for legacy system maintenance or repair where original form factors are mandatory. Evaluate modern alternatives if new design implementation is possible. Consider the limited availability and potential supply chain risks associated with end-of-life products. Verify that the 16-DIP package fits the target PCB layout constraints.

Part Context

Part of the A3966 family of dual full-bridge motor drivers. Shares core functionality with variants like A3966SLB but differs in packaging technology. Represents an older generation of integrated motor control solutions focusing on simplicity and low external component count for bipolar stepper applications.

Replacement Considerations

TB6562AFG,8,EL is listed as a similar alternative part number.