A3977SEDTR-T

Overview

The A3977SEDTR-T is a complete microstepping bipolar stepper motor driver manufactured by Allegro MicroSystems. It integrates control logic, translator, and power DMOS outputs in a single package. The device supports full, half, quarter, and eighth-step resolutions. Key electrical specifications include a maximum output current of 2.5 A and a load voltage rating up to 35 V. The logic supply voltage operates within a range of 3 V to 5.5 V. It utilizes a 44-pin PLCC (LCC) surface-mount package with J-leads.

Feature Summary

• Integrates a microstep translator for simplified interface requirements
• Features automatic current decay mode detection and selection
• Includes internal under-voltage lockout and thermal shutdown protection

Applications

• Bipolar stepper motor control systems
• General-purpose motion control applications
• Industrial automation equipment

Procurement Notes

Verify the specific package variant during procurement, as the SEDTR suffix denotes the tape-and-reel packaging format for the 44-PLCC case. Confirm RoHS compliance status, as earlier versions may differ from current manufacturing standards. Cross-reference the manufacturer's part number directly with distributor listings to ensure accurate identification of the integrated circuit revision and availability.

Selection Notes

Select this component when a fully integrated solution for bipolar stepper motors is required without external discrete drivers. It is suitable for designs needing mixed, fast, or slow decay modes and synchronous rectification. Ensure the application environment accommodates the operating temperature range and that the PCB layout supports the thermal performance of the 44-PLCC package.

Part Context

This part belongs to the A3977 family of microstepping DMOS drivers. It serves as an evolution of earlier versions like the A3977SED, offering updated packaging options such as the tape-and-reel configuration for automated assembly. The device maintains the core functionality of high-current driving and built-in translation while adapting to modern manufacturing supply chain requirements.

Replacement Considerations

The A3977SLPTR-T is listed as a similar alternative part number.