A2557ELBTR-T

Overview

The A2557ELBTR-T is a bipolar power driver integrated circuit manufactured by Allegro MicroSystems, designed for driving relays and solenoids. It features four low-side outputs with a maximum output current of 300mA per channel and supports load voltages up to 60V. The device operates within a supply voltage range of 4.75V to 5.25V and utilizes a non-inverting open/switch interface. Packaged in a 16-PowerSOIC surface-mount enclosure, it includes fixed overcurrent protection and thermal shutdown capabilities. The component functions across an operating temperature range of -40°C to 85°C.

Feature Summary

• Integrates four independent low-side bipolar outputs for simultaneous relay or solenoid control
• Provides fixed overcurrent limiting and thermal shutdown protection for enhanced reliability
• Features a status flag output to indicate operational state or fault conditions

Applications

• Relay driver circuits
• Solenoid actuation systems
• Industrial load switching applications

Procurement Notes

Verify component authenticity through authorized channels as the A2557ELBTR-T is officially listed as obsolete by the manufacturer. Confirm that the specific package variant matches design requirements, noting potential packaging changes documented in product change notices. Ensure replacement strategies account for end-of-life status when planning long-term production runs.

Selection Notes

Select this component for applications requiring simple on/off control of multiple low-power inductive loads without complex microstepping requirements. The 1:1 input-to-output ratio simplifies logic interfacing compared to multiplexed drivers. Consider the 16-SOIC footprint for PCB layout constraints and verify that the 300mA per-channel limit meets the peak current demands of the target relays or solenoids.

Part Context

This part belongs to the A2557 family of power drivers from Allegro MicroSystems, specialized for general-purpose load switching. Unlike motor controllers such as the A3955 which offer microstepping, the A2557 focuses on robust, direct drive capabilities for binary loads. It serves as a dedicated solution for managing multiple discrete inductive loads in compact industrial or automotive environments.

Replacement Considerations

• A2557ELB

FAQ

What type of fault protection is included in the A2557ELBTR-T?

The device incorporates fixed overcurrent limiting and thermal shutdown circuitry to protect against short circuits and overheating.

Is the A2557ELBTR-T currently available for new production?

No, the component is classified as obsolete by the manufacturer, indicating it is no longer actively produced for new designs.