A3953SLBTR-T

Overview

The A3953SLBTR-T is a full-bridge PWM motor driver designed for bipolar stepper and brushed DC motors. It features a 16-SOIC surface-mount package with an output current rating of ±1.3 A and a voltage rating of 50 V. The device operates on a logic supply voltage between 3 V and 5.5 V, supporting internal PWM current control. It includes fast and slow current-decay modes, saturated sink drivers below 1 A, and protection against thermal shutdown, crossover current, and UVLO.

Feature Summary

• Integrates full-bridge power stage with dedicated control circuitry for simplified system design
• Supports both fast and slow current-decay modes to optimize motor performance under varying loads
• Includes internal transient-suppression diodes and thermal shutdown circuitry for enhanced reliability

Applications

• Bipolar stepper motor microstepping drives
• Brushed DC motor speed and direction control
• General-purpose motor driver circuits requiring integrated protection

Procurement Notes

Verify the specific suffix 'SLBTR-T' matches the required SOIC-16 package and tape-and-reel quantity. Confirm that the 1.3 A continuous current rating aligns with your thermal management capabilities. Ensure the 50 V output voltage rating exceeds your maximum load requirements. Check for RoHS compliance status if environmental regulations apply to your assembly process.

Selection Notes

Select this component when a single-chip solution for bipolar motors is required without external discrete power transistors. It is suitable for applications needing precise current regulation via internal PWM. Consider the 16-pin SOIC footprint for PCB layout constraints. Evaluate the 3 V to 5.5 V logic interface compatibility with your microcontroller or processor outputs before finalizing the design.

Part Context

This part belongs to Allegro's A3953 series of full-bridge PWM motor drivers. It is functionally similar to the A3951 and A3952 but offers specific current and voltage ratings tailored for medium-power applications. The series is designed to replace older discrete solutions by integrating control and power stages into a compact package.

Replacement Considerations

Direct substitutes include the A3951 and A3952 from the same manufacturer family. Verify pinout compatibility and electrical ratings before swapping. Other manufacturers may offer equivalent full-bridge drivers, but functional equivalence must be confirmed through detailed datasheet comparison.