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Product Detailed Parameters
- Description：IC PWR DRIVER BIPOLAR 1:1 16SOIC
- Series：-
- Mfr：Allegro MicroSystems
- Package：Bulk
- Switch Type：Relay, Solenoid Driver
- Number of Outputs：4
- Ratio - Input:Output：1:01
- Output Configuration：Low Side
- Output Type：Bipolar
- Interface：On/Off
- Voltage - Load：60V (Max)
- Voltage - Supply (Vcc/Vdd)：4.75V ~ 5.25V
- Current - Output (Max)：300mA
- Rds On (Typ)：-
- Input Type：Non-Inverting
- Features：Status Flag
- Fault Protection：Current Limiting (Fixed), Over Temperature
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Supplier Device Package：16-SOIC
- Package / Case：16-PowerSOIC (0.295", 7.50mm Width)
- Grade：-
- Qualification：-
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Overview
The A2557KLB is a bipolar power driver IC from Allegro MicroSystems, designed for driving relays and solenoids. It features four low-side outputs with a maximum current of 300mA per channel. The device operates within a supply voltage range of 4.75V to 5.25V and supports loads up to 60V. It includes fixed current limiting and overtemperature fault protection, along with status flag reporting. The component is housed in a 16-SOIC package and functions across an industrial temperature range of -40°C to 125°C.
Feature Summary
- Provides four independent low-side bipolar output channels for load switching applications.
- Integrates fixed current limiting and overtemperature protection mechanisms for fault management.
- Includes status flag functionality to indicate operational state or fault conditions.
Applications
- Relay driver circuits
- Solenoid driver circuits
Procurement Notes
Verify component authenticity through authorized distributors due to discontinued status. Confirm RoHS compliance requirements as this specific variant may not meet modern environmental standards. Check for lead-free alternatives if required by project specifications. Ensure storage conditions adhere to moisture sensitivity level guidelines before reflow soldering.
Selection Notes
Select this part when four-channel bipolar switching is required with integrated protection. Consider the 16-SOIC package constraints for PCB layout. Evaluate thermal performance within the specified operating range. Compare against newer Allegro models if RoHS compliance is mandatory for the target application.
Part Context
The A2557 series represents a family of power drivers optimized for automotive and industrial load control. This specific model belongs to the K-grade temperature variant, offering extended reliability compared to standard commercial grades. It serves as a legacy solution for systems requiring robust relay and solenoid actuation with built-in diagnostic feedback capabilities.
Replacement Considerations
Check for direct pin-compatible upgrades within the Allegro portfolio. Verify that alternative components support the same 300mA output current and 60V load voltage ratings. Ensure replacement parts maintain the 16-SOIC form factor if board space is constrained.
