LTC4257CS8-1#TRPBF

Overview

The LTC4257CS8-1#TRPBF is a Powered Device (PD) interface controller compliant with IEEE 802.3af standards, designed for Power over Ethernet applications. It operates within a supply voltage range of up to 57V and supports a maximum power dissipation of 13W. The device features an automotive-grade operating temperature range from -40°C to +125°C. Packaged in an 8-pin SOIC-N surface-mount package, it integrates complete signature detection and power management functions required for PoE systems.

Feature Summary

• Provides complete signature and power interface functions for IEEE 802.3af PD operation
• Integrates dual current limiting capabilities for enhanced protection
• Designed specifically for automotive environments with extended temperature ratings

Applications

• IEEE 802.3af Power over Ethernet powered devices
• Automotive networking equipment requiring robust power interfaces
• Industrial control systems utilizing PoC/PoE connectivity

Procurement Notes

Verify component authenticity through authorized Analog Devices channels due to limited availability status. Confirm the specific suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with existing PCB footprints for SOIC-8 packages before finalizing procurement decisions.

Selection Notes

Select this component when designing IEEE 802.3af compliant systems requiring automotive-grade reliability. The integrated controller simplifies design by handling signature detection and power negotiation. Consider the 13W power limit and 57V input range against system requirements. Verify thermal management strategies are adequate for the specified operating temperature range.

Part Context

This part belongs to the LTC4257 family of PoE controllers manufactured by Analog Devices. It serves as a specialized interface solution for powering networked devices via Ethernet cables. The CS8-1 designation identifies the specific automotive grade variant with SOIC-8 packaging and reel distribution format.

Replacement Considerations

Direct substitutes include other LTC4257 variants such as the IDD-1 version for commercial temperature ranges or non-reel packaged versions like the #PBF suffix. Evaluate pinout compatibility and thermal performance when considering alternative packages within the same functional family.