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802.3af/at 12V PoE Module

The PD-1003 module is designed to extract power from a conventional twice pair 1000M Ethernet or single pair 10/100M Ethernet cable. Let customer easily and flexible building in product design.

This designed can provide total power up to 30W as specified by the POE plus IEEE802.3at standard. In addition, The PD-1003 module can be interfaced to any PSE that follow detection and classification procedures defined by the IEEE802.3af/at standard.

The PD-1003 can be used in numerous applications, in the example shown below, the data+power outputs from the PoE switch are connected to the each output that supports Power over Ethernet (PoE).   

In this example port 1 is connected to an ethernet camera and port 2 is connected to a wireless access point, both of these devices have a built-in PD-1003. When the PoE Switch is switched on (or when the device is connected), the PoE Switch will check each output for a PoE signature. On ports 1 and 2 the PD-1003 will identify themselves as PoE enabled devices and will supply both data and power to these peripherals.   

The other ports (shown in this example) will not have a PoE signature and on ly pass the data through to these peripherals. The PoE Switch will continuously monitor each output to see if a PoE enabled device has been added or removed.

► Compliant IEEE802.3af/at PD interface 

► Small SIL package size – 56.2mm (L) x 25mm (H)   

► Input voltage range 40V to 57V 

► Minimal (low cost) external components required  

► Short-circuit protection

► 1500V isolation (input to output) 

Block Diagram

Package Format

Pin Description

Typical System Diagram

PD Signature

When the PD-1003 is connected to the Cat 5e cable, it will automatically present a Powered Device (PD) signature to the Power Sourcing Equipment (PSE), when requested.

The equipment will then recognize that a powered device is connected to that line and supply power.


To meet the safety isolation requirements of IEEE802.3af/at section 33.4.1 a Powered Device (PD) must pass the electrical strength test of IEC 60950 sub clause 

6.2. This calls for either a) 1500Vac test or b) 1500V impulse test. The PD-1003 is specified to meet the 1500Vdc impulse test. It is also important that the tracks on either side of the isolation barrier have at least a 3mm clearance.

DC/DC Converter

The PD-1003's DC/DC converter provides a regulated low ripple and low noise output that has built-in short -circuit output protection.

Operation Temerature

Because the PD-1003 is a power component, it will generate heat, so it is important that this be taken into consideration at the design stage.   The heart of the PD-1003 is a DC/DC converter, which like any other power supply will generate heat.

The amount of heat generated by the module will depend on the load it is required to drive and the input voltage supplied by the PSE.

The PD-1003 has a maximum ambient operating temperature of 70℃. These results are in still air without any heat sinking. The output stage of the PD-1003 has no built-in thermal protection, to prevent the module from being damaged it is recommended that the PD-1003 module be powered by an IEEE 802.3af/at compliant PSE or PoE Switch equipment.  However the PD-1003 may be powered by a user designed power supply which should include thermal and over current protection. Because each application is different it is impossible to give fixed and absolute thermal recommendations. 

Electrical Characteristics

Absolute Maximum Ratings

Recommended Operating Conditions

DC Electrical Characteristics