A3973SLB

Overview

The Allegro A3973SLB is a full-bridge PWM motor driver IC designed for brushed DC and bipolar stepper motors. It features a 16-pin SOIC package with a maximum collector-emitter voltage of 50 V and an output current of 1.5 A. The device operates on a logic supply voltage between 3 V and 5.5 V, supporting a typical switching frequency of 70 kHz. It functions within a temperature range of -20°C to 85°C.

Feature Summary

• Integrates full-bridge power stage and control logic for simplified system design
• Supports both fast and slow current decay modes for precise motor control
• Includes internal protection mechanisms such as thermal shutdown and cross-current protection

Applications

• Brushed DC motor control systems
• Bipolar stepper motor applications
• Industrial automation equipment

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and electrical characteristics. Ensure the selected variant matches the required package type and operating temperature range for your application environment.

Selection Notes

Select this component when a compact solution for low-voltage motor driving is required. Consider the 1.5 A current limit and 50 V voltage rating to ensure compatibility with the target motor specifications and load conditions.

Part Context

The A3973 series represents a transition from bipolar to DMOS technology, offering higher power density and improved switching performance compared to previous generations like the A3953. It serves as a direct replacement in designs requiring enhanced efficiency and reduced component size.

Replacement Considerations

The A4973 is documented as a direct replacement for the A3953, utilizing DMOS technology. Verify pin-to-pin compatibility and electrical parameter alignment before substituting other Allegro motor drivers.