A4950ELJTR-T

Overview

The A4950ELJTR-T is a full-bridge DMOS PWM motor driver designed for brushed DC motor control. It supports load supply voltages from 8 V to 40 V and delivers output currents up to 3.5 A. The device integrates two half-bridge outputs in an 8-pin SOIC package with an exposed pad. Operating temperatures range from -40°C to 85°C. Key electrical parameters include a maximum collector-emitter voltage of 40 V, standby current of 10 mA, and input current of 20 mA.

Feature Summary

• Integrates internal synchronous rectification control circuitry to reduce power dissipation during PWM operation.
• Includes comprehensive protection features such as overcurrent protection, thermal shutdown with hysteresis, and crossover-current protection.
• Supports low-power standby mode and adjustable PWM current limiting for efficient motor management.

Applications

• Pulse width modulated (PWM) control of DC motors
• General purpose motor driver circuits
• Industrial automation systems

Procurement Notes

Verify the specific suffix ELJTR against official Allegro MicroSystems documentation to confirm package type and temperature grade. Ensure compatibility with system voltage requirements between 8 V and 40 V. Confirm moisture sensitivity level handling procedures during assembly. Cross-reference pinout configurations with the latest datasheet to prevent integration errors.

Selection Notes

Select this component for applications requiring integrated control and power stages for brushed DC motors. The 8-SOIC-EP package suits surface mount designs needing thermal performance. Verify that the commercial temperature grade (-40°C to 85°C) meets environmental constraints. Consider the 3.5 A current capability relative to motor load requirements.

Part Context

This part belongs to the A4950 family of DMOS full-bridge motor drivers manufactured by Allegro MicroSystems. It serves as a complete solution for driving DC motors with external PWM signals. The device combines logic inputs with high-current output stages, simplifying design complexity compared to discrete solutions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult official manufacturer resources for potential cross-references or updated series replacements.

FAQ

What is the function of the internal synchronous rectification?

It lowers power dissipation during PWM operation by actively controlling the freewheeling path instead of relying on body diodes.

How does the device protect against short circuits?

It includes overcurrent protection that detects motor lead shorts to ground or the battery supply.