A3977KLPTR-T

Overview

The A3977KLPTR-T is a complete microstepping motor driver with an integrated translator, designed for bipolar stepper motors. It supports full-, half-, quarter-, and eighth-step modes. The device features a fixed off-time current regulator capable of slow, fast, or mixed decay modes to reduce audible noise and improve accuracy. Key electrical parameters include a ±2.5 A output drive capability, a 35 V maximum voltage rating, and a logic supply voltage range of 3.0 V to 5.5 V. It utilizes DMOS technology in a 28-TSSOP-EP package.

Feature Summary

• Integrates a translator for direct step/dir control without external microcontroller logic
• Features automatic current decay mode detection and selection for optimized performance
• Includes internal protection circuits such as thermal shutdown and crossover-current protection

Applications

• Bipolar stepper motor control systems
• Industrial automation equipment
• Office automation devices

Procurement Notes

Verify the specific suffix KLPTR against the manufacturer's latest datasheet to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status as historical data indicates potential variations. Ensure the ordering quantity aligns with standard reel sizes if applicable. Cross-reference the part number with official Allegro MicroSystems documentation to validate availability and any recent product change notices.

Selection Notes

Select this component when a fully integrated solution for bipolar stepper motors is required. It is suitable for applications needing precise microstepping resolution up to 1/8 step. Consider the 35 V and ±2.5 A ratings to ensure compatibility with the target motor's voltage and current requirements. The integrated translator simplifies interface design by reducing the need for external logic components.

Part Context

The A3977 series represents Allegro MicroSystems' DMOS microstepping drivers with built-in translators. This family is engineered to provide high-performance motor control with reduced system complexity. The KLPTR variant specifically denotes the surface-mount TSSOP package configuration within this established product line.

Replacement Considerations

A3977SLPTR-T is documented as a similar alternative. Verify pinout and package compatibility before substitution.