A3949SLBTR

Overview

The A3949SLBTR-T is a DMOS full-bridge motor driver designed for brushed DC motor applications. It operates on a single supply voltage ranging from 8V to 36V and delivers an output current of 2.8A. The device integrates control logic and power stages in a 16-pin SOIC package. Key electrical parameters include a maximum load voltage of 36V, an operating temperature range of -20°C to 150°C (TJ), and a typical switching frequency of 70kHz. It features internal UVLO, crossover current protection, and thermal shutdown.

Feature Summary

• Integrates full-bridge DMOS power outputs with control logic for simplified system design
• Includes internal protections such as thermal shutdown, under-voltage lockout, and crossover current prevention
• Supports sleep mode functionality to minimize power consumption during standby

Applications

• Brushed DC motor control in industrial automation systems
• Motor drivers for office equipment such as printers and scanners
• General-purpose motion control applications requiring integrated power stages

Procurement Notes

Verify the specific suffix (e.g., TR vs T) to confirm tape-and-reel packaging requirements. Confirm RoHS compliance status as historical data indicates some variants may not meet current standards. Check component availability as this part number has been marked as obsolete or discontinued by major distributors. Ensure the selected substitute matches the pinout and electrical ratings if direct sourcing is unavailable.

Selection Notes

Select this component for applications requiring a compact, single-supply solution for brushed DC motors. The 2.8A output capability suits moderate-load scenarios. Consider the 16-pin SOIC package for surface-mount assembly constraints. Evaluate the thermal performance given the high junction temperature rating. Verify that the 8V to 36V input range aligns with the system power architecture before integration.

Part Context

The A3949 belongs to Allegro's family of DMOS full-bridge motor drivers. It serves as a predecessor or alternative to newer models like the A3950. The series is characterized by integrated power MOSFETs and control circuitry, reducing external component count. This specific variant utilizes a standard SOIC footprint, distinguishing it from TSSOP or QFN packages found in other family members.

Replacement Considerations

The A3950SLPTR-T is documented as a parameter-equivalent replacement for the A3949SLPTR. Verify pin compatibility and electrical specifications when substituting. Other similar devices include the A3948 and A3955, though these differ in interface type or microstepping capabilities.