A3986SLDTR-T

Overview

The A3986SLDTR-T is a bipolar stepper motor driver from Allegro Microsystems, designed for precise motion control applications. It features an integrated translator that converts step and direction inputs into full bridge drive signals, simplifying interface requirements. The device supports microstepping resolutions of 1/2, 1/4, 1/8, and 1/16 steps per full step. It incorporates a fixed off-time current control mode with programmable average current regulation to manage torque and thermal performance. Key electrical parameters include a maximum supply voltage of 35 V and a peak output current capability of 2.0 A. The component operates within a temperature range of -20 °C to +85 °C and is housed in a TSSOP-24 package.

Feature Summary

• Integrated translator eliminates the need for external logic to generate phase waveforms from simple step and direction commands.
• Fixed off-time current control mode provides stable torque output across varying supply voltages and temperatures.
• Programmable current regulation allows users to set the maximum RMS current to match specific motor requirements.
• Built-in protection mechanisms include overcurrent limiting and thermal shutdown to safeguard the driver and load.

Applications

• Two-phase hybrid stepper motor control in industrial automation equipment
• Positioning systems in office automation devices such as printers and scanners
• Motion control modules in security systems and access control hardware

Procurement Notes

Verify the exact suffix against the manufacturer's official datasheet to confirm pinout compatibility and thermal pad configuration. Ensure the ordering part number matches the required package variant and temperature grade. Cross-reference specifications with the latest Allegro MicroSystems documentation to validate electrical ratings before integration.

Selection Notes

Select this component when a single-chip solution for bipolar stepper motors is required without complex external logic. It is suitable for applications needing moderate speed and torque with simplified control interfaces. Consider the thermal dissipation capabilities of the TSSOP-24 package relative to the expected load current and ambient operating conditions.

Part Context

This part belongs to the A3986 family of stepper motor drivers, which are widely used in embedded motion control systems. The series is characterized by its ease of use due to the internal translator and robust protection features. It serves as a standard interface between digital controllers and stepper motors in various commercial and industrial sectors.

Replacement Considerations

Direct replacements may include other Allegro MicroSystems stepper drivers with similar pinouts and electrical characteristics, such as the A3977 or A4983, provided they meet the specific voltage and current requirements of the application. Verify functional equivalence through official cross-reference data.