A3973SLBTR

Overview

The A3973SLBTR-T is a fully integrated bipolar stepper motor driver IC manufactured by Allegro MicroSystems. It operates on a 3V to 5.5V supply voltage and supports load voltages up to 35V. The device features a 28-pin TSSOP-EP package with an exposed pad for thermal management. It provides a peak output current of 2.5A per phase and includes internal DMOS power stages. Key specifications include a junction temperature range of -20°C to 150°C, logic interface compatibility, and support for full, half, quarter, and eighth step resolutions.

Feature Summary

• Fully integrated control and power stage design
• Internal chopper current regulation
• Multiple microstepping resolution options
• Thermal shutdown protection

Applications

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

Procurement Notes

Verify the specific suffix (e.g., SLBTR) against official datasheets to confirm package type and tape-and-reel configuration. Ensure the ordering part number matches the required moisture sensitivity level and RoHS compliance status. Cross-reference manufacturer documentation for any recent product change notices affecting pinout or electrical characteristics.

Selection Notes

Select this component for applications requiring high current drive in a compact surface-mount package. The exposed pad design facilitates heat dissipation for sustained operation. Verify that the system logic levels are compatible with the specified input interface. Consider the maximum load voltage limits when designing the power supply circuitry for the connected stepper motor.

Part Context

This part belongs to the A39xx family of stepper motor drivers from Allegro MicroSystems. These devices are designed to simplify the implementation of bipolar stepper motor control by integrating necessary logic and power components into a single chip. The family is widely used in applications demanding precise motion control with minimal external component count.

Replacement Considerations

Check official Allegro MicroSystems documentation for direct replacements within the A39xx series. Verify pin-to-pin compatibility and electrical parameter equivalence before substitution.