A3959SB-T

Overview

The A3959SB-T is a DMOS full-bridge PWM motor driver manufactured by Allegro MicroSystems. It features an output current rating of ±3 A and a load voltage rating of 50 V. The device operates within a supply voltage range of 9.5 V to 50 V, with a maximum power dissipation of 3.1 W. It supports a working frequency of 4.25 MHz and draws a typical operating supply current of 4 mA. The component is housed in a TSSOP-28 surface-mount package and functions across a temperature range of -20°C to +85°C.

Feature Summary

• Integrates synchronous rectification for reduced power dissipation
• Includes internal crossover-current protection and UVLO circuitry
• Supports mixed, fast, and slow current-decay modes

Applications

• Brushed DC motor control
• Solenoid driving
• Valve actuation

Procurement Notes

Verify the exact suffix against official Allegro documentation to confirm pinout and thermal characteristics. Ensure the ordering part number matches the specific package variant required for your PCB layout. Confirm RoHS compliance status through the manufacturer's latest release notes before finalizing procurement.

Selection Notes

Select this component for applications requiring high current drive capability up to 3 A in a compact surface-mount form factor. Consider the TSSOP-28 package for thermal management requirements and the integrated protection features for robust system reliability in automotive or industrial environments.

Part Context

This part belongs to the A3959 family of DMOS full-bridge drivers from Allegro MicroSystems. It is designed for high-performance motor control applications, offering integrated logic and power stages. The series is known for providing complete solutions for brushed DC motors and solenoids with minimal external components.

Replacement Considerations

A3959SLB-T