A3989SEVTR-T

Overview

The A3989SEVTR-T is a bipolar stepper motor driver manufactured by Allegro MicroSystems, designed for high-performance motion control applications. It integrates full-featured DMOS power stages with a serial interface for simplified system design. The device supports step resolutions of 1, 1/2, 1/4, and 1/8 steps, enabling precise motor positioning. It operates within a supply voltage range of 3V to 5.5V and handles load voltages from 8V to 36V. The maximum output current per phase is 3.5A, suitable for driving medium-power bipolar stepper motors. The component is housed in a 36-pin QFN package (HVQCCN) with exposed thermal pads for efficient heat dissipation. It features an operating junction temperature range of -20°C to 85°C.

Feature Summary

• Integrates full-featured DMOS power stages with a serial interface for simplified system design
• Supports multiple step resolutions including 1, 1/2, 1/4, and 1/8 steps for precise positioning
• Provides high output current capability up to 3.5A per phase for medium-power applications

Applications

• Bipolar stepper motor control in industrial automation systems
• Precision positioning mechanisms in office equipment such as printers and scanners
• Motion control modules in medical devices requiring accurate movement

Procurement Notes

Verify the specific suffix 'SE' indicates the 36-QFN package variant when sourcing replacements. Confirm that the target application does not require voltage levels exceeding the 36V load limit or currents beyond the 3.5A rating. Check for RoHS compliance status if environmental regulations apply to the end product. Ensure the serial interface timing requirements match the host controller's capabilities before finalizing procurement.

Selection Notes

Select this component when a compact solution with integrated power stages and serial communication is required for bipolar stepper motors. It is appropriate for designs needing up to 3.5A output current and operation within an 8V to 36V load voltage range. Consider the 36-pin QFN package constraints regarding thermal management and PCB space. Evaluate if the specified operating temperature range meets the environmental conditions of the intended deployment scenario.

Part Context

The A3989 belongs to Allegro's family of bipolar stepper motor drivers, offering integrated solutions for motion control. It complements other models like the A3988 and A3998 by providing higher current capacity in a similar form factor. The series is designed to reduce external component count and simplify driver circuitry for various automation tasks.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.