QUAD IEEE 802.3at Power-Over-Ethernet PSE Controller

QUAD IEEE 802.3at Power-Over-Ethernet PSE Controller - TPS23861

Special Note

In need of 8 channels and/or port remapping? Check out the TPS2388


The TPS23861 is an easy-to-use, flexible, IEEE802.3at PSE solution. As shipped, it automatically manages four 802.3at ports without the need for any external control.

The TPS23861 automatically detects Powered Devices (PDs) that have a valid signature, determines power requirements according to classification and applies power. Two-event classification is supported for type-2 PDs. The TPS23861 supports DC disconnection and the external FET architecture allows designers to balance size, efficiency and solution cost requirements.

The unique pin-out enables 2-layer PCB designs via logical grouping and clear upper and lower differentiation of I2C and power pins. This delivers best-in-class thermal performance, Kelvin accuracy and low-build cost.

In addition to automatic operation, the TPS23861 supports Semi-Auto Mode via I2C control for precision monitoring and intelligent power management. Compliance with the 400-ms TPON specification is ensured whether in semi-automatic or automatic mode.


  • IEEE 802.3at Quad Port PSE Controller
    • Auto Detect, Classification
    • Auto Turn-On and Disconnect
    • Efficient 255-mΩ Sense Resistor
  • Pin-Out Enables Two-Layer PCB
  • Kelvin Current Sensing
  • 4-Point Detection
  • Automatic Mode – As Shipped
    • No External Terminal Setting Required
    • No Initial I2C Communication Required
  • Semi-Automatic Mode – Set by I2C Command
  • Optional I2C Control and Monitoring
  • –40°C to 125°C Temperature Range
  • TSSOP 28 Package 9.8 mm x 6.6 mm

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Parametrics Compare all products in Power Sourcing Equipment

Vin (Min) (V)
Vin (Max) (V)
PoE Standards Supported
MPS Method
Pair Control
Operating Temperature Range (C)
No. of PSE Ports
TPS23861 TPS2388
44    44   
57    57   
Programmable    Programmable   
Programmable    Programmable   
802.3at Type 2    802.3at Type 1 (802.3af)
802.3at Type 2   
External    External   
DC Disconnect    DC Disconnect   
Alternative A    Alternative A   
-40 to 125    -40 to 125   
4    8   
Autonomous Mode
Current Limit with Foldback
Multi Level Port Priority
Over Current Reporting
Over Temp Reporting   
Fast shutdown
Multi Level Port Priority
Over Current Reporting
Over Temp Reporting
Port remapping   
28TSSOP    56QFN