A3977KEDTR

Overview

The A3977KEDTR is a complete microstepping motor driver with a built-in translator, designed for bipolar stepper motors. It supports full-, half-, quarter-, and eighth-step modes. The device features an output drive capability of 35 V and ±2.5 A. It includes a fixed off-time current regulator capable of operating in slow-, fast-, or mixed-decay modes to reduce audible noise and improve step accuracy. Key electrical parameters include a logic supply voltage range of 3.0 to 5.5 V and low rDS(on) outputs (0.45 Ω source, 0.36 Ω sink typical).

Feature Summary

• Integrated translator for simplified control interface
• Automatic current decay mode detection and selection
• Synchronous rectification for reduced power dissipation
• Internal protection circuits including UVLO and thermal shutdown

Applications

• Bipolar stepper motor control systems
• Industrial automation equipment
• Precision motion control applications

Procurement Notes

Verify the specific suffix 'KED' against official Allegro documentation to confirm package type and temperature rating. Confirm availability status as distributors may list obsolete variants. Ensure ESD handling protocols are followed during installation.

Selection Notes

Select this component when a fully integrated solution with built-in translation is required. It eliminates external logic components. Verify that the load voltage and current requirements fall within the 35 V and 2.5 A limits. Check thermal management needs for high-current operation.

Part Context

This part belongs to the A3977 family of microstepping DMOS drivers. It is functionally similar to other variants like A3977SED or A3977KLP but differs in packaging and potentially environmental ratings. It serves as a direct replacement for legacy designs requiring integrated stepper control.

Replacement Considerations

A3977SLPTR-T is listed as a similar alternative by distributors.