A2557ELBTR

Overview

The A2557ELBTR-T is a bipolar power driver IC 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. The device operates within a supply voltage range of 4.75V to 5.25V and supports load voltages up to 60V. It utilizes a non-inverting open/switch interface with a 1:1 input-to-output ratio. Integrated fault protection includes fixed current limiting and overtemperature shutdown. The component is housed in a 16-PowerSOIC package and functions across an operating temperature range of -40°C to 85°C.

Feature Summary

• Provides four independent low-side bipolar outputs for relay and solenoid actuation
• Integrates fixed current limiting and overtemperature protection mechanisms
• Features a status flag output for monitoring operational conditions
• Utilizes a simple non-inverting open/switch control interface

Applications

• Relay driver circuits
• Solenoid driver applications
• Industrial control systems requiring load switching
• Automotive subsystems compatible with 5V logic

Procurement Notes

Verify the exact suffix configuration, as the A2557ELBTR-T indicates tape and reel packaging while other variants may differ. Confirm RoHS compliance status and check for end-of-life notifications, as this specific part number is listed as obsolete in some distributor databases. Ensure the procurement source provides valid datasheets matching the Allegro MicroSystems official documentation to guarantee technical accuracy.

Selection Notes

Select this component when a multi-channel bipolar driver is required for low-current loads like relays or solenoids. The 300mA output capability suits small electromagnetic actuators. Consider the 16-SOIC package for surface mount assembly constraints. Verify that the system's thermal environment remains within the specified -40°C to 85°C range to ensure reliable operation without triggering overtemperature protection.

Part Context

The A2557 belongs to Allegro MicroSystems' line of power management integrated circuits focused on load driving. This series addresses applications needing isolated or semi-isolated switching for inductive loads. The device integrates control logic and power stages into a single chip, reducing external component count compared to discrete solutions. It is part of a broader portfolio including motor drivers and sensor interfaces from the same manufacturer.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided data. The A2557ELBTR-T is listed as obsolete; verify if the base model A2557ELB or other Allegro load drivers offer equivalent functionality.