LTC4257CDD-1#PBF

Power Over Ethernet (PoE) Controllers Overview

The LTC4257CDD-1#PBF is a Powered Device (PD) power switch IC compliant with IEEE 802.3af standards for Power over Ethernet applications. It integrates an internal controller and features a maximum current limit of 375 mA with a typical on-resistance of 2 Ohms. The device operates within a supply voltage range up to -57 V and maintains a quiescent operating current of 3 mA. Designed for surface-mount installation, it is housed in an 8-lead DFN package and supports an operating temperature range from 0°C to +70°C.

Power Over Ethernet (PoE) Controllers Feature Summary

• Integrates internal control logic for simplified Powered Device implementation
• Complies with IEEE 802.3af PoE standards for network power delivery
• Provides integrated current limiting and thermal protection mechanisms

Power Over Ethernet (PoE) Controllers Applications

• IEEE 802.3af Powered Device implementations
• Power over Ethernet network endpoints
• PoE-powered peripheral devices

Power Over Ethernet (PoE) Controllers Procurement Notes

Verify component authenticity through authorized Analog Devices channels or certified distributors. Confirm the specific suffix matches the required package and temperature grade. Check current availability status as supply may be limited. Ensure compliance with RoHS directives and environmental regulations relevant to your region before finalizing procurement orders.

Power Over Ethernet (PoE) Controllers Selection Notes

Select this component for designs requiring a compact, single-channel PoE solution adhering to 802.3af specifications. The DFN-8 package offers space efficiency for dense layouts. Consider the 375 mA current limit when sizing downstream loads. Evaluate the -57 V input tolerance against your network's power sourcing equipment capabilities to ensure robust operation under varying line conditions.

Power Over Ethernet (PoE) Controllers Part Context

This part belongs to the LTC4257 family of PoE power switches. It serves as a dedicated interface between the Ethernet transformer and the load, managing power extraction and protection. The CDD-1 variant specifies the commercial temperature range and DFN-8 packaging, distinguishing it from other pinout or package options within the broader series.

Power Over Ethernet (PoE) Controllers Replacement Considerations

Direct substitutes include the LTC4257CS8-1#TRPBF, which shares identical electrical characteristics but utilizes an SOIC-8 package instead of the DFN-8 form factor. Verify footprint compatibility and thermal performance differences when transitioning between these package types.