Power over Ethernet

Power over Ethernet, also known as PoE, is a standard in which power is transferred via Ethernet cable. This cable is a twisted pair which allows the connection of both data and power, and is usually in the format of an RJ-45 cable. Power over Ethernet allows straight forward installation of network devices as it provides both the power and data connection in one.

PoE devices are designed to sit within a circuit and help to inject or extract power into Ethernet data lines. They provide protection to the system, such as overcurrent and under-powering. PoE applications are also very easy to install, therefore minimising the risk of error.

Power over Ethernet ICs come in a standard semiconductor package, such as a QFN or SOIC.

What are PoE standards?

Power over Ethernet uses IEEE standards which enable interoperability between PoE-compatible devices and software. PoE uses the IEEE 802.3af and IEEE 802.3at (PoE+) standards.

Types of Power over Ethernet IC:

  • PoE PD (powered device)
  • PoE PSE (power sourcing equipment)

Where are PoE devices used?

Power over Ethernet can be found in applications which require connection to a network and to a power source. They are commonly used in PoE mid-spans, switches and injectors. These are found in telecommunications, IP cameras, IP TVs, network routers and intelligent lighting.


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Description Price PoE Controller Type Minimum Input Voltage Maximum Input Voltage Minimum Operating Temperature Maximum Operating Temperature Package Type Pin Count Dimensions Height Length Width Mounting Type
RS Stock No. 200-3698
Mfr. Part No.Si3471A-A01-IM
HK$23.98
Each (In a Pack of 2)
units
Power Sourcing Equipment (PSE) 44 V - -40 °C 85 °C QFN 38 7 x 5 x 0.85mm 0.85mm 7mm 5mm Surface Mount
RS Stock No. 200-3697
Mfr. Part No.Si3471A-A01-IM
HK$26.45
Each (In a Tube of 31)
units
Power Sourcing Equipment (PSE) 44 V - -40 °C 85 °C QFN 38 7 x 5 x 0.85mm 0.85mm 7mm 5mm Surface Mount