A3959SLB

Overview

The A3959SLB is a DMOS full-bridge PWM motor driver designed for brushed DC motors. It features an integrated control and power stage with ±3 A output current capability and a 50 V load voltage rating. The device utilizes a 24-SOIC surface-mount package. Key electrical parameters include a supply voltage range of 4.5 V to 5.5 V, low on-resistance outputs, and operation within a junction temperature range of -20°C to 150°C.

Feature Summary

• Integrates full-bridge DMOS power switches with mixed, fast, and slow current-decay modes
• Includes synchronous rectification to minimize power dissipation
• Features internal crossover-current protection and thermal-shutdown circuitry
• Contains internal UVLO and an oscillator for digital PWM timing

Applications

• Brushed DC motor control systems
• General-purpose motion control applications
• Industrial automation actuators

Procurement Notes

Verify component authenticity through authorized Allegro MicroSystems distributors or certified partners. Confirm the specific suffix matches the required package variant. Check for RoHS compliance status as historical data indicates potential non-compliance for this specific part number. Validate lead times and production lifecycle status prior to finalizing procurement plans.

Selection Notes

Select this component for applications requiring high current handling in a compact SOIC footprint. Ensure the design supports the 4.5 V to 5.5 V logic supply range. Consider thermal management requirements due to the 150°C junction temperature limit. Verify that the 24-pin package fits the PCB layout constraints compared to alternative TSSOP versions.

Part Context

This part belongs to the A3959 family of DMOS full-bridge motor drivers from Allegro MicroSystems. It serves as a complete solution for driving brushed DC motors by combining logic control with high-power switching elements. The series is characterized by robust protection features and efficient synchronous rectification for thermal performance.

Replacement Considerations

A3959SLBTR-T (Reel version)

FAQ

What type of current decay modes does the A3959SLB support?

The device supports mixed, fast, and slow current-decay modes.

Does the A3959SLB include protection against short circuits?

Yes, it includes internal crossover-current protection and thermal-shutdown circuitry.