LTC4257CDD-1#TRPBF

Overview

The LTC4257CDD-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 8-lead DFN package. Key electrical parameters include a maximum on-resistance of 2 Ohms, a current limit of 375 mA, and a supply voltage range up to -57 V. The device operates within a temperature range of 0°C to +70°C and draws a typical operating supply current of 3 mA.

Feature Summary

• Integrates IEEE 802.3af powered device detection and classification logic
• Includes internal high-side power switch for load connection
• Supports hot-swap insertion without system disruption

Applications

• IEEE 802.3af powered network endpoint devices
• VoIP telephones and wireless access points
• Security cameras and sensor networks

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix matches the required tape-and-reel packaging configuration. Ensure compliance with RoHS directives and check for any active product change notifications that may affect pinout or electrical characteristics prior to final design approval.

Selection Notes

Select this component for designs requiring integrated PoE PD functionality in compact form factors. The DFN-8 package suits space-constrained PCB layouts. Evaluate thermal performance under maximum load conditions given the 2 Ohm on-resistance. Compare against alternative controllers if higher current limits or extended temperature ranges are required for the specific application environment.

Part Context

This part belongs to the LTC4257 series of PoE controllers designed for low-power applications. It serves as a complete solution for powering networked devices via Ethernet cables. The -1 suffix typically denotes specific classification thresholds or operational variants within the family, distinguishing it from non-suffixed or differently suffixed counterparts.

Replacement Considerations

LTC4257CDD-1#PBF is the tube-packaged equivalent of this reel-delivered component.