A3948SB

Overview

The A3948SB is a discontinued DMOS full-bridge PWM motor driver manufactured by Allegro MicroSystems. It features a 24-pin PowerDIP package with a 7.62mm width. The device operates with a logic supply voltage (VDD) ranging from 4.5V to 5.5V and supports a load supply voltage (VBB) between 20V and 50V. It delivers an output current of 1.5A. Key electrical parameters include source on-resistance of 500mΩ and drain on-resistance of 300mΩ. The operating junction temperature range spans from -20°C to 150°C.

Feature Summary

• Integrates a full-bridge output structure built with DMOS technology for efficient DC motor control.
• Includes internal charge pump circuitry to generate high-side gate drive voltages.
• Provides comprehensive protection mechanisms such as thermal shutdown and undervoltage lockout.

Applications

• Industrial automation systems requiring precise DC motor regulation
• Robotic actuators and motion control modules
• General-purpose motor driver circuits

Procurement Notes

Verify component status carefully as the A3948SB is officially discontinued. Confirm RoHS compliance requirements, noting that this specific part may not meet current environmental standards. Ensure design-in timing accounts for end-of-life constraints and potential supply chain limitations when sourcing replacement inventory or managing existing production runs.

Selection Notes

Select this component only if legacy compatibility with 24-pin DIP form factors is mandatory. Evaluate alternative modern drivers if surface-mount solutions or updated environmental certifications are required. Consider the specific voltage ranges and current capabilities against actual load demands to ensure adequate thermal performance within the specified operating temperature limits.

Part Context

This device belongs to the A3948 series of integrated motor controllers designed for brushed DC applications. It combines control logic and power stages into a single semiconductor solution. The SB suffix indicates a specific package variant within the broader product family, distinguishing it from other pin-compatible or functionally similar offerings in the manufacturer's portfolio.

Replacement Considerations

• TB6560AHQ