A3972SB-T

Overview

The A3972SB-T is a dual DMOS full-bridge microstepping PWM motor driver designed for bipolar stepper motors. It supports continuous output currents up to ±1.5 A and operating voltages up to 50 V. The device features a 4 MHz internal oscillator, synchronous rectification, and a serial interface for control. It operates within a temperature range of -20°C to 150°C TJ and is housed in a 24-pin PowerDIP package.

Feature Summary

• Integrated 6-bit linear DACs enable optimized microstepping performance.
• Programmable mixed, fast, and slow current-decay modes via serial interface.
• Synchronous rectification reduces power dissipation during operation.

Applications

• Pulse-width modulated current control of bipolar microstepping stepper motors
• General-purpose motion control systems requiring precise positioning

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration. Confirm the 24-pin PowerDIP footprint matches the target PCB layout. Ensure thermal management strategies account for the 150°C junction temperature rating under expected load conditions.

Selection Notes

Select this component when bipolar stepper motor control with integrated microstepping is required. The serial interface simplifies logic connections compared to parallel drivers. Consider the ±1.5 A continuous current limit for motor sizing and verify compatibility with 3.3 V or 5 V control signal levels.

Part Context

This part belongs to Allegro's A3972 series of dual DMOS full-bridge drivers. It serves as an evolution of the legacy 3972 model, offering enhanced microstepping capabilities through digital control interfaces while maintaining robust power handling for industrial automation applications.

Replacement Considerations

The A3972SB is a compatible variant within the same family. Verify pinout and electrical specifications against the original design requirements before substitution.

FAQ

What types of current-decay modes are supported?

The device supports programmable mixed, fast, and slow current-decay modes controlled via its serial interface.

Is the device compatible with standard logic levels?

Yes, inputs are compatible with both 3.3 V and 5 V control signals.