A3953SLB

Overview

The A3953SLB is a full-bridge PWM motor driver designed for bipolar stepper and brushed DC motors. It features ±1.3 A continuous output current and a 50 V output voltage rating. The device operates with a logic supply voltage of 3 V to 5.5 V. Key electrical parameters include internal PWM current control, fast and slow current-decay modes, and an integrated thermal shutdown circuit. It is housed in a 16-PowerSOIC package with a width of 7.50 mm.

Feature Summary

• Integrates full-bridge driver with internal PWM current control for precise motor regulation
• Supports fast and slow current-decay modes for optimized torque performance
• Includes internal transient-suppression diodes and thermal shutdown protection
• Features crossover-current and UVLO protection for enhanced system reliability

Applications

• Bipolar stepper motor microstepping applications
• Brushed DC motor control systems
• General-purpose motor driver circuits requiring integrated power stage

Procurement Notes

Verify component authenticity through authorized Allegro MicroSystems distributors or certified partners. Confirm the specific suffix and packaging type matches design requirements. Check for obsolescence notices as this part may be discontinued. Ensure ESD handling protocols are followed during storage and assembly. Validate RoHS compliance status against current regulatory standards before procurement.

Selection Notes

Select this component for applications requiring a fully integrated motor driver with ±1.3 A capability. Suitable for designs needing 50 V voltage tolerance and 3 V to 5.5 V logic interface. Consider the 16-SOIC package for surface-mount assembly. Evaluate thermal management needs due to integrated power dissipation. Verify compatibility with existing control logic levels and decay mode requirements.

Part Context

The A3953SLB belongs to the A3953 series of full-bridge PWM motor drivers from Allegro MicroSystems. This family provides integrated solutions for driving bipolar stepper and brushed DC motors. The series is known for combining power stages with control logic in a single package. It serves as a compact alternative to discrete driver implementations.

Replacement Considerations

TB6562AFG8ELCT-ND by Toshiba Semiconductor and Storage is listed as a similar replacement option.