A2557SLBTR

Overview

The A2557SLBTR is a four-channel power driver manufactured by Allegro MicroSystems, designed for switching applications such as relays and solenoids. It features a bipolar output configuration with a maximum continuous output current of 300mA per channel. The device operates within a supply voltage range of 4.75V to 5.25V and supports load voltages up to 60V. Packaged in a 16-SOIC surface-mount housing, it includes integrated fault protection mechanisms like fixed current limiting and thermal shutdown. The component is marked as obsolete.

Feature Summary

• Provides four independent low-side bipolar outputs for driving inductive loads
• Integrates fixed current limiting and thermal shutdown for circuit protection
• Includes status flag output for monitoring operational state

Applications

• Relay driver circuits
• Solenoid actuation systems
• General purpose load switching

Procurement Notes

This part number is officially listed as obsolete by the manufacturer. Verification of availability should focus on surplus distributors or alternative packaging variants within the same family. Confirm RoHS compliance status, as the SLB suffix indicates non-compliance compared to ELB variants. Ensure design-in decisions account for end-of-life status and potential long-term supply constraints.

Selection Notes

Select this component when a four-channel low-side driver with 300mA capacity is required for relay or solenoid control. Verify that the 60V load voltage rating meets system requirements. Consider the A2557ELBTR-T if RoHS3 compliance is mandatory, as the SLB variant does not meet these specifications. Ensure the 16-SOIC package fits the PCB layout constraints.

Part Context

The A2557 belongs to Allegro's A2557 series of power drivers, which are optimized for driving high-current inductive loads. This specific model represents the tape-and-reel version of the standard A2557SLB die-attached device. It shares core electrical characteristics with other suffixes but differs in packaging format and environmental compliance ratings.

Replacement Considerations

Public data confirms the A2557ELBTR-T as a compatible alternative within the same family. This substitute offers identical electrical performance but complies with RoHS3 standards. Other A2557 variants may be considered if packaging differences are acceptable.