NCP1081DEG

Overview

The NCP1081DEG is an integrated high-power Power over Ethernet (PoE) Powered Device (PD) interface and DC-DC converter controller manufactured by onsemi. It supports IEEE 802.3at PoE+ standards, enabling efficient power delivery over Ethernet cabling. The device integrates a Class 4 PD interface with a synchronous buck DC-DC converter to provide regulated output voltages for downstream loads. Designed for space-constrained applications, it features comprehensive protection mechanisms including thermal shutdown and current limiting. The component operates within standard industrial temperature ranges and utilizes a compact surface-mount package suitable for automated assembly in network infrastructure equipment.

Feature Summary

• Integrated PoE-PD interface compliant with IEEE 802.3at standards
• Built-in synchronous buck DC-DC converter for voltage regulation
• Class 4 power classification support for high-power applications
• Comprehensive protection features including thermal and current limits

Applications

• High-power IP cameras and video surveillance systems
• Wireless access points and enterprise networking hardware
• VoIP phones and unified communication endpoints
• IoT gateways requiring PoE power injection

Procurement Notes

Verify the specific suffix 'DEG' against official datasheets to confirm package type and tape-and-reel specifications. Ensure compliance documentation such as RoHS and REACH declarations are available for the exact part number variant. Cross-reference the manufacturer's latest revision history to confirm pinout compatibility and functional equivalence before integration into new designs.

Selection Notes

Select this component when designing systems requiring integrated PoE reception and DC-DC conversion in a single solution. It is suitable for applications needing Class 4 power levels up to 25.5W. Consider the thermal performance of the package and the need for external passive components for the buck converter loop stability. Evaluate board space constraints as the integrated nature reduces component count compared to discrete solutions.

Part Context

The NCP1081 series belongs to onsemi's portfolio of integrated PoE controllers. It complements other models like the NCP1080 and NCP1083, which offer variations in auxiliary supply support and power class capabilities. This family addresses the growing demand for higher power delivery in Ethernet-powered devices, simplifying design complexity by combining interface logic and power conversion stages.

Replacement Considerations

Potential substitutes include the NCP1080 for lower power requirements or the NCP1083 if 9V auxiliary supply support is needed. Verify electrical parameters and pinout compatibility before substitution. Consult official cross-reference guides for any updated revisions or alternative packages offered by the manufacturer.