A3958SLB

Overview

The A3958SLB is a DMOS full-bridge PWM motor driver designed for brushless DC motors. It features a serial interface for programmable control and integrates power stages capable of ±2A continuous output current with a 50V voltage rating. The device includes internal charge pumps, voltage regulation, and protection circuits such as thermal shutdown and cross-current prevention. Packaged in a 24-SOIC surface-mount format, it supports operating temperatures from -20°C to 150°C junction temperature.

Feature Summary

• Integrates full-bridge power stage with DMOS technology for efficient motor driving
• Utilizes a three-wire serial interface for configuration of decay modes and timing parameters
• Includes internal transient-suppression diodes and synchronous rectification mechanisms
• Provides comprehensive protection against over-temperature, under-voltage lockout, and crossover currents

Applications

• Brushless DC motor control systems
• General purpose industrial motor drives
• Automotive actuator applications

Procurement Notes

Verify the specific suffix and package variant when sourcing, as the base part number may correspond to discontinued or legacy versions. Confirm RoHS compliance status and availability through authorized distributors, as stock levels fluctuate. Ensure the selected component matches the required 24-SOIC pinout and electrical specifications for your design.

Selection Notes

Select this component for applications requiring integrated control and power stages for brushless DC motors. Consider the serial interface requirements and the need for external decoupling capacitors for the internal voltage regulator. Evaluate thermal management needs given the high junction temperature rating and power dissipation characteristics of the DMOS outputs.

Part Context

This component belongs to Allegro's family of integrated motor drivers that combine logic and power electronics. It is distinct from stepper motor drivers like the A3955 due to its specific optimization for brushless DC topologies and serial communication protocols rather than parallel microstepping inputs.

Replacement Considerations

Public sources indicate the A3958SLB is discontinued. Verify functional equivalents with similar serial interfaces and ±2A/50V ratings. Cross-reference pinouts carefully as direct substitutes may differ in package dimensions or control logic.