Product details

Vin (Min) (V) 44 Vin (Max) (V) 57 ILIM Programmable PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 FET External MPS method DC Disconnect Pair control 2-Pair Alt A Operating temperature range (C) -40 to 125 Features Autonomous Mode, Current Limit with Foldback, Fast shutdown, Over Current Reporting, Over Temp Reporting, Programmable ICUT Number of PSE ports 4
Vin (Min) (V) 44 Vin (Max) (V) 57 ILIM Programmable PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 FET External MPS method DC Disconnect Pair control 2-Pair Alt A Operating temperature range (C) -40 to 125 Features Autonomous Mode, Current Limit with Foldback, Fast shutdown, Over Current Reporting, Over Temp Reporting, Programmable ICUT Number of PSE ports 4
TSSOP (PW) 28 62 mm² 9.7 x 6.4
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet TPS23861 IEEE 802.3at Quad Port Power-over-Ethernet PSE Controller datasheet (Rev. I) 23 Jul 2019
Application note Using the TPS23861 and TPS23882B in Autonomous Mode Features and Benefits 30 Jul 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 (Rev. E) 24 Apr 2018
Application note Lightning Surge Considerations for PoE Power Sourcing Equipment Devices 20 Feb 2017
Technical article Make your PSE system smarter and more efficient 16 Feb 2017
Application note TPS23861 VDD Power Solutions 24 Aug 2016
Application note TPS23861 Power-On Considerations 21 Jul 2015
Technical article Mutual ID and its effect on backwards compatibility 07 Nov 2014
Technical article Simplify your PCB layout - When 2 is better than 6 19 Sep 2014
Technical article Proper Detection is Important, No Fooling! 05 Sep 2014
Application note SIFOs 802.3at Conformance Report, v 4.0.77, TPS23861 11 Jun 2014
Application note University of New Hampshire Interoperability Lab Interoperability Test, TPS23861 11 Jun 2014
Application note University of New Hampshire Interoperability Lab Conformance Test, TPS23861 25 Apr 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS23861EVM-612 — TPS23861EVM-612 Evaluation Module for Quad IEEE 802.3at PoE PSE Controller

This easy-to-use design can be easily multiplied to 8-, 12-, 16-port and so on, while offering the industry’s best interoperability as well as a double sided PCB design.

Applications include Ethernet switch, surveillance Network Video Recorder (NVR), and small home/office routers.

The full PoE (...)

Not available on TI.com
Code example or demo

TPS23861 PoE MSP430 Reference Code for Multi-Port Power Management Applications (Rev. B)

SLUC600B.ZIP (1466 KB)
lock = Requires export approval (1 minute)
Code example or demo

TPS23861 Power over Ethernet MSP430 Reference Code for Basic Applications (Rev. B)

SLVC573B.ZIP (933 KB)
lock = Requires export approval (1 minute)
Driver or library

TI-USB Serial-Adapter-API and README file

SLVC460.ZIP (3993 KB)
Driver or library

LGPL Library Source Used by PI-Commander

SLVC576.ZIP (238831 KB)
lock = Requires export approval (1 minute)
GUI for evaluation module (EVM)

PI-Commander EVM GUI

SLVC572.ZIP (14513 KB)
lock = Requires export approval (1 minute)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

TIDA-010046 — EMC-compliant 10/100-Mbps Ethernet PHY reference design with IEEE802.3at Type-1 (≤ 12.95 W) PoE-PD

This reference design is optimized for 10 to 100 Mbps using the low-power Ethernet physical layer (PHY) DP83825 supporting 150-m reach over CAT5e cable which is beyond the standard Ethernet distance limitation of 100 m (328 feet). This design has power delivery over Ethernet cable along with data (...)
Reference designs

TIDA-00465 — Single Port, Power-over-Ethernet, Type 2 Auto-Mode PSE Reference Design

TIDA-00465 is an application using TPS23861 as a single port, type 2, PoE auto-mode PSE in a small form factor. The design will inject power onto any Ethernet cable for PoE powered loads up to 30W.
Reference designs

TIDA-01411 — Type 2 PoE PSE, 6kV Lightning Surge Reference Design

This reference design provides lightning surge protection solution for Power over Ethernet (PoE) Power Sourcing Equipment (PSE) systems based on TI's TPS23861 PSE controller. The need for implementing such protection will normally depend on the environment in which the PSE is intended to operate (...)
Reference designs

PMP20199 — 85-265VAC Input, 54V/30W Power Over Ethernet PSE Reference Design

This reference design provides a universal AC input, 30W PSE solution for Power Over Ethernet.  The UCC28700 uses primary side regulation to create an isolated 54V rail at low cost.  The TPS23861 injects the 54V rail onto the ethernet cable.
Reference designs

PMP20588 — Fully Autonomous Single Port Type 2 (30W) PoE PSE Reference Design

The PMP20588 reference design utilizes the TPS23861 PSE controller to implement a single port Type 2 PoE PSE.  An isolated flyback converter, utilizing the LM5022 current mode PWM controller, accepts a 12Vdc/24Vac input and provides a 55Vdc/600mA output source for the PSE.  It is ideally (...)
Reference designs

TIDA-00290 — PoE PSE Type 2 (30W) IEEE 802.3at Fully Autonomous Quad Port Solution.

This reference design is fully autonomous IEEE802.3at, Type-2 (30 W) Power-over-Ethernet (PoE) 4-port power sourcing equipment (PSE). An additional configuration of two non-standard, high-power ports (<60 W) is provided. Both configurations support gigabit Ethernet data pass through in (...)
Package Pins Download
TSSOP (PW) 28 View options

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