A3985SLDTR-T

Overview

The A3985SLDTR-T is a bipolar stepper motor driver manufactured by Allegro MicroSystems, housed in a 38-pin TSSOP surface-mount package. It operates with a supply voltage range of 12V to 50V and supports step resolutions of full step and half step. The device integrates power MOSFETs and features an SPI interface for control. It functions as a controller providing commutation and direction management capabilities. The component is rated for an operating temperature range from -20°C to +85°C.

Feature Summary

• Integrates power MOSFETs with an SPI interface for digital control
• Provides internal commutation and direction management logic
• Supports bipolar stepper motors with selectable full or half-step resolution

Applications

• General purpose motor control systems
• Industrial automation equipment
• Office automation devices

Procurement Notes

Verify the specific suffix DTR against official datasheets to confirm tape-and-reel packaging and pinout compatibility. Ensure the target application voltage remains within the 12V to 50V operational range. Confirm that the system design accommodates the 38-pin TSSOP footprint and thermal requirements for the specified temperature range.

Selection Notes

Select this component when an SPI-controlled bipolar stepper driver is required for applications needing 12V to 50V operation. It is suitable for designs prioritizing integrated commutation logic over external microstepping controllers. Consider the 38-pin package size relative to available PCB space compared to lower-pin alternatives.

Part Context

This part belongs to the A3985 series of bipolar stepper motor drivers from Allegro MicroSystems. It is designed for general-purpose applications requiring robust motor control with digital interface capabilities. The series focuses on integrating power stages and control logic into a single mixed-signal IC solution.

Replacement Considerations

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