A3973SB-T

Overview

The A3973SB-T is a dual DMOS full-bridge microstepping PWM motor driver designed for bipolar stepper motors. It integrates control logic and power stages in a single package. The device operates with a supply voltage range of 4.5V to 5.5V and supports load voltages from 15V to 35V. It delivers an output current of 1A per phase. Step resolution options include 1, 1/2, 1/4, 1/8, 1/16, and 1/64 steps. The component functions within a junction temperature range of -20°C to 150°C and utilizes a 24-pin DIP package with two power tabs.

Feature Summary

• Integrates full-bridge drivers and control logic for simplified system design
• Supports multiple microstepping resolutions for smooth motor operation
• Features built-in protection mechanisms including overcurrent and thermal shutdown

Applications

• General purpose bipolar stepper motor control
• Industrial automation actuators
• Office equipment motion control

Procurement Notes

Verify component authenticity through authorized Allegro MicroSystems distributors or certified partners. Confirm the specific suffix designation matches the required package variant. Check current lifecycle status as this part may be obsolete; validate availability of direct substitutes if production continuity is required. Ensure storage conditions comply with manufacturer guidelines for surface-mounted devices.

Selection Notes

Select this driver for applications requiring precise positioning of bipolar stepper motors with moderate current demands. Consider the integrated protection features for robust industrial environments. Evaluate the available microstepping resolutions against the required motion smoothness and torque characteristics. Verify that the operating voltage ranges align with the system's power supply constraints.

Part Context

This component belongs to Allegro MicroSystems' line of dedicated stepper motor drivers. It is engineered to provide reliable performance in motion control systems. The series is known for integrating complex drive functions into compact packages, reducing external component count. It serves as a solution for applications needing accurate step control without complex external circuitry.

Replacement Considerations

Public confirmed substitute part number: A3992SLPTR-T. Verify pin compatibility and electrical specifications before substitution.