A3958SLBTR-T

Overview

The A3958SLBTR-T is a fully integrated brushed DC motor driver manufactured by Allegro MicroSystems. It features a DMOS technology architecture housed in a 24-lead SOIC package with an exposed thermal pad for efficient heat dissipation. The device supports a supply voltage range of 4.5V to 5.5V and delivers a continuous output current of 2A per half-bridge, totaling two outputs. It operates within a temperature range of -20°C to 150°C junction temperature and utilizes a serial interface for control.

Feature Summary

• Integrates full bridge drivers with dedicated control logic and power stages on a single chip
• Utilizes a three-wire serial interface for programmable operation and status monitoring
• Incorporates internal charge pump and voltage regulator for stable high-side driving
• Includes comprehensive protection mechanisms such as thermal shutdown and cross-current prevention

Applications

• General purpose brushed DC motor control systems
• Industrial automation actuators requiring precise speed regulation
• Consumer electronics utilizing small DC motors
• Automotive interior applications compatible with standard voltage rails

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific tape-and-reel packaging configuration matches production requirements. Check for obsolescence notices as this part may be discontinued. Ensure ESD handling protocols are followed during storage and assembly. Validate that the 24-SOIC footprint aligns with existing PCB designs.

Selection Notes

Select this component for applications requiring a compact solution for brushed DC motors with moderate current demands. The serial interface reduces pin count compared to parallel control schemes. Consider thermal performance due to the exposed pad requirement. Evaluate system voltage compatibility against the 4.5V to 5.5V operating range. Assess if microstepping capabilities are unnecessary as this model targets simple DC drive.

Part Context

This device belongs to Allegro's line of intelligent motor drivers designed for simplified system implementation. It replaces discrete MOSFET solutions by integrating gate drivers and protection circuits. The series focuses on reducing bill-of-materials complexity while maintaining robust performance in noisy environments. It serves as a cost-effective alternative to complex stepper controllers for basic DC applications.

Replacement Considerations

The A3959SLBTR-T is listed as a similar replacement option. Verify pinout compatibility and electrical parameter alignment before substitution. Cross-reference with STMicroelectronics L6229DTR for potential sourcing alternatives. Confirm that any substitute maintains the required 2A output capability and serial interface protocol.