A3901SEJTR-T

Overview

The A3901SEJTR-T is a fully integrated bipolar stepper motor driver manufactured by Allegro MicroSystems. It combines control logic, an oscillator, over-temperature protection, and power MOSFET output stages in a single package. The device supports full, half, and quarter stepping modes with a parallel interface for direct connection to microcontrollers. It operates within a supply voltage range of 2.5V to 5.5V and delivers an output current capability of 400mA. The component is housed in a 10-WFDFN (3x3) surface-mount package with an exposed pad for thermal management.

Feature Summary

• Fully integrated design combining control logic and power MOSFET outputs
• Supports full, half, and quarter step resolution modes
• Includes built-in over-temperature protection circuitry
• Features a parallel interface for straightforward microcontroller integration

Applications

• Battery-powered portable devices requiring low-voltage motor control
• General-purpose bipolar stepper motor applications
• Small robotic systems and actuators
• Automotive interior mechanisms such as seat adjusters or mirror controls

Procurement Notes

Verify the specific suffix TR-T indicates tape and reel packaging when ordering. Confirm the 10-WFDFN package dimensions match your PCB footprint requirements. Ensure the 2.5V to 5.5V operating range aligns with your system's power supply rails. Check for RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component for applications requiring a compact solution for bipolar stepper motors. It is suitable for systems where space is limited due to its small DFN package. Consider the 400mA output limit when sizing for motor loads. The parallel interface simplifies firmware development compared to serial alternatives.

Part Context

This part belongs to the A3901 series of stepper motor drivers from Allegro MicroSystems. It is designed as a cost-effective solution for low-power motion control tasks. The series is known for integrating complex drive functions into minimal footprints, facilitating easy implementation in consumer electronics and industrial automation components.

Replacement Considerations

Check for A3901SEJ variants with different packaging options if reel quantities differ. Verify compatibility with existing board layouts when substituting with other Allegro stepper drivers like the A3967, noting differences in current ratings and interface types.