LTC4257CS8#TRPBF

Overview

The LTC4257CS8-1#TRPBF is a Power over Ethernet (PoE) Powered Device controller compliant with IEEE 802.3af standards, manufactured by Analog Devices Inc. It integrates a power switch and control logic within an SOIC-8 surface-mount package. The device operates from a supply voltage of up to -57V and features a maximum on-resistance of 2 Ohms. It supports a current limit of 375 mA and functions reliably across an operating temperature range of -40°C to +85°C. Designed for SMD/SMT installation, it consumes a typical operating supply current of 3 mA.

Feature Summary

• Integrated PoE Powered Device controller meeting IEEE 802.3af specifications
• On-chip power switch with integrated current limiting capabilities
• Compact SOIC-8 surface-mount package design for space-constrained applications

Applications

• IEEE 802.3af Powered Device implementations
• Power-over-Ethernet LAN interface circuits
• Industrial network equipment power management

Procurement Notes

Verify the exact part number suffix carefully, as the provided model lacks the specific '-1' designation found in official documentation for this component family. Confirm availability status directly with authorized distributors, as limited supply conditions may apply. Ensure the selected variant matches the required package type and operational temperature range for your specific system design requirements before finalizing procurement.

Selection Notes

Select this component when designing systems requiring strict adherence to IEEE 802.3af PoE standards. Consider the SOIC-8 footprint constraints and the -57V input voltage capability. Evaluate the 375 mA current limit against load requirements. Verify thermal performance within the specified -40°C to +85°C range for your intended environment.

Part Context

This component belongs to the LTC4257 series of PoE controllers from Analog Devices. It serves as a specialized solution for integrating power delivery over Ethernet networks. The series includes variants with different packaging options and slight functional distinctions, such as the IDD-1 version available in DFN-8 packages.

Replacement Considerations

The LTC4257IDD-1#PBF is a documented alternative within the same product family, offering similar functionality in a DFN-8 package.