A2557KLBTR

Overview

The A2557KLBTR is a power driver integrated circuit manufactured by Allegro MicroSystems, designed for driving relays and solenoids. It features four low-side bipolar outputs capable of delivering up to 300mA each, with a maximum load voltage rating of 60V. The device operates on a single supply voltage ranging from 4.75V to 5.25V and utilizes a non-inverting open/switch interface. Packaged in a 16-PowerSOIC surface-mount housing, it supports an extended operating temperature range from -40°C to 125°C.

Feature Summary

• Provides four independent low-side bipolar output channels for simultaneous load control
• Integrates fixed current limiting and thermal shutdown protection mechanisms
• Includes status flag output capability for real-time fault monitoring
• Supports direct interfacing with standard logic controllers via non-inverting inputs

Applications

• Relay driver circuits in industrial automation systems
• Solenoid actuation in automotive control modules
• Load switching in office automation equipment
• General-purpose high-current switching in consumer electronics

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer-certified channels due to the part's discontinued status. Confirm RoHS compliance requirements, as this specific suffix variant may not meet current environmental standards compared to newer equivalents. Validate package integrity upon receipt, ensuring no damage to the 16-PowerSOIC leads during storage or transit.

Selection Notes

Select this component when four isolated low-side bipolar drivers are required within a compact surface-mount footprint. Ensure the application load voltage does not exceed 60V and continuous current remains within the 300mA per channel limit. Consider the extended temperature range suitability for harsh environments where standard commercial grade parts may fail.

Part Context

This device belongs to the A2557 family of power drivers, which are specialized for controlling inductive loads such as relays and solenoids. The series is characterized by its robust DMOS technology and integrated protection features, making it suitable for demanding applications in automotive and industrial sectors where reliability under high stress conditions is critical.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific discontinued model are not available in the provided documentation. Users should consult official Allegro MicroSystems resources for potential pin-compatible alternatives or functional replacements that meet identical electrical specifications.

FAQ

What is the maximum load voltage supported by the A2557KLBTR?

The device supports a maximum load voltage of 60V.

Does the A2557KLBTR include thermal protection?

Yes, it includes internal thermal shutdown circuitry to protect against overheating.

What is the input type for this power driver?

The input type is non-inverting, allowing direct connection to standard logic signals.