A3977KLPTR

Overview

The A3977KLPTR is a bipolar stepper motor driver manufactured by Allegro MicroSystems. It utilizes DMOS technology and features a 28-TSSOP-EP package with an exposed pad for thermal management. The device supports logic supply voltages from 3V to 5.5V and load voltages ranging from 8V to 35V. It provides an output current of 2.5A and offers step resolutions including full, half, quarter, and eighth steps. The component operates within a junction temperature range of -40°C to 150°C.

Feature Summary

• Integrates full microstepping control with translator functionality
• Includes automatic current decay mode detection and selection
• Features internal under-voltage lockout and thermal shutdown protection

Applications

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

Procurement Notes

Verify the specific suffix KLPTR against the official datasheet to confirm package type and RoHS compliance status. Note that this part number may be listed as obsolete or discontinued in some distributor catalogs; check for active replacement options if availability is critical. Ensure the ordering quantity matches the manufacturer's standard packaging requirements.

Selection Notes

Select the A3977KLPTR when a fully integrated DMOS stepper driver with built-in translation is required. It is suitable for applications needing high operating temperatures up to 150°C junction. Consider the 28-TSSOP-EP package for surface mount assembly and improved heat dissipation compared to non-exposed pad variants.

Part Context

The A3977 series represents Allegro's solution for complete microstepping motor drivers. This specific model integrates the power stage, logic interface, and protection circuits into a single chip. It simplifies design by eliminating the need for external discrete components typically required for current regulation and decay mode management in stepper applications.

Replacement Considerations

Public documentation indicates the A3977KLPTR is marked as obsolete. Verify availability of the A3977SLPTR-T as a potential alternative, ensuring compatibility with RoHS3 standards and checking for any changes in package dimensions or pinout.