A3998SETTR-T

Overview

The A3998SETTR-T is a fully integrated bipolar stepper motor driver manufactured by Allegro MicroSystems. It utilizes DMOS technology to provide complete control and power stages within a single package. The device supports serial interface communication for step, direction, and microstepping resolution selection. It operates with a supply voltage range of 3V to 5.5V and handles load voltages from 9V to 50V. The output current capability is rated at 1.5A. It features four half-bridge outputs and is available in a 32-QFN (5x5) surface-mount package.

Feature Summary

• Fully integrated driver combining control logic and power stage components
• Serial interface for simplified connection and configuration
• Supports multiple microstepping resolutions including full, half, quarter, and eighth steps
• Built-in protection mechanisms for thermal and over-current conditions

Applications

• Bipolar stepper motor control systems
• General purpose motion control applications
• Low-voltage embedded motor drive circuits

Procurement Notes

This component has reached End-of-Life status as per manufacturer product change notices. Verification of availability should focus on remaining stock or authorized distributors rather than direct manufacturing orders. Compliance with RoHS3 standards is confirmed. Users must validate lead times and substitute options due to the discontinued production status.

Selection Notes

Designers should consider the low supply voltage requirement of 3V to 5.5V when selecting this driver for system integration. The serial interface reduces pin count but requires specific timing protocols. The 1.5A output rating suits moderate torque applications. Thermal management is critical given the high junction temperature tolerance up to 150°C. Alternative drivers may be necessary if higher current or parallel interface support is required.

Part Context

The A3998 series represents Allegro's solution for compact bipolar stepper motor driving. This specific variant integrates the necessary logic and power MOSFETs into a small footprint. It is designed for applications where space constraints and simple interfacing are priorities. The device simplifies motor control design by eliminating external discrete components typically needed for gate driving and protection.

Replacement Considerations

No public confirmed substitute part numbers are documented.