LTC4257IS8#TRPBF

Overview

The LTC4257IS8#TRPBF is a Powered Device (PD) interface controller compliant with IEEE 802.3af standards, designed for Power over Ethernet (PoE) applications. It integrates signature detection, power path control, and protection features within an SOIC-8 package. The device operates with a maximum supply voltage of 57 V and supports a current limit of 375 mA. Its on-resistance is specified at a maximum of 2 Ohms. The component functions reliably across an operating temperature range from -40°C to +85°C, drawing a typical supply current of 3 mA.

Feature Summary

• Integrates complete signature and power interface functions for IEEE 802.3af PD systems
• Provides internal control for power switching and protection mechanisms
• Supports hot-swap insertion capabilities without external components

Applications

• IEEE 802.3af Powered Device power management
• Ethernet-powered network equipment interfaces
• PoE endpoint circuit design

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing. Confirm the IS8 variant meets industrial temperature requirements (-40°C to +85°C). Ensure compatibility with existing IEEE 802.3af infrastructure before integration. Cross-reference manufacturer documentation for pinout accuracy in SOIC-8 configurations.

Selection Notes

Select this component for designs requiring integrated PoE PD functionality without external controllers. The SOIC-8 package offers a compact footprint suitable for space-constrained PCB layouts. Consider the 375 mA current limit and 2 Ohm on-resistance against load requirements. Verify thermal performance within the specified industrial temperature range during operation.

Part Context

This part belongs to the LTC4257 family of PoE interface controllers manufactured by Analog Devices. It serves as a specialized solution for powering devices via Ethernet cables while managing power integrity and safety protocols. The series is widely utilized in networking hardware requiring standardized PoE compliance.

Replacement Considerations

DC959A is listed as a direct replacement evaluation board for the LTC4257-1 series.