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 open-in-new Find other Power sourcing equipment

Package | Pins | Size

TSSOP (PW) 28 62 mm² 9.7 x 6.4 open-in-new Find other Power sourcing equipment


  • 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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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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Similar but not functionally equivalent to the compared device:
TPS23882 ACTIVE Type-3 2-pair 8-channel PoE PSE controller with SRAM and 200 mΩ Rsense This product is a IEEE802.3bt-ready PSE controller.

Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet TPS23861 IEEE 802.3at Quad Port Power-over-Ethernet PSE Controller datasheet (Rev. I) Jul. 23, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guides TPS23861EVM-612: Auto-Mode Evaluation Module for TPS23861 (Rev. E) Apr. 24, 2018
Application notes Lightning Surge Considerations for PoE Power Sourcing Equipment Devices Feb. 20, 2017
Technical articles Make your PSE system smarter and more efficient Feb. 16, 2017
Application notes TPS23861 VDD Power Solutions Aug. 24, 2016
Application notes TPS23861 Power-On Considerations Jul. 21, 2015
Technical articles Mutual ID and its effect on backwards compatibility Nov. 07, 2014
Technical articles Simplify your PCB layout - When 2 is better than 6 Sep. 19, 2014
Technical articles Proper Detection is Important, No Fooling! Sep. 05, 2014
Application notes SIFOs 802.3at Conformance Report, v 4.0.77, TPS23861 Jun. 11, 2014
Application notes University of New Hampshire Interoperability Lab Interoperability Test, TPS23861 Jun. 11, 2014
Application notes University of New Hampshire Interoperability Lab Conformance Test, TPS23861 Apr. 25, 2014

Design & development

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

Hardware development

document-generic User guide

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 (...)

  • Motherboard/daughterboard configuration supporting 4x type 2 (30W) ports and 2x 4 pair ports (60W).
  • TPS23861EVM-612 accepts MSP-EXP430G2 (MSP430 LaunchPad) EVM for power managing the TPS23861s. Basic power manager firmware is available for the MSP430 upon request.
  • TPS23861EVM-612 interface to (...)
SLVC572.ZIP (14513 KB)

Software development

SLUC600B.ZIP (1466 KB)
SLVC573B.ZIP (933 KB)
SLVC460.ZIP (3993 KB)
SLVC576.ZIP (238831 KB)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

EMC-compliant 10/100-Mbps Ethernet PHY reference design with IEEE802.3at Type-1 (≤ 12.95 W) PoE-PD
TIDA-010046 — This reference design provides a cost-optimized solution 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 also demonstrates power (...)
document-generic Schematic document-generic User guide
Type 2 PoE PSE, 6kV Lightning Surge Reference Design
TIDA-01411 — 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 and (...)
document-generic Schematic document-generic User guide
Single Port, Power-over-Ethernet, Type 2 Auto-Mode PSE Reference Design
TIDA-00465 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.
document-generic Schematic document-generic User guide
85-265VAC Input, 54V/30W Power Over Ethernet PSE Reference Design
PMP20199 — 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.
document-generic Schematic document-generic User guide
Fully Autonomous Single Port Type 2 (30W) PoE PSE Reference Design
PMP20588 — 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 (...)
document-generic Schematic document-generic User guide
PoE PSE Type 2 (30W) IEEE 802.3at Fully Autonomous Quad Port Solution.
TIDA-00290 A fully autonomous IEEE802.3at, Type 2 (30W) Power-over-Ethernet (PoE) 4 Port Power Sourcing Equipment (PSE) solution. An additional configuration of two non-standard, high power ports (<60W) is provided. Both configurations support Gigabit Ethernet data pass through in 1000BASE-T ports.

This (...)

document-generic Schematic

CAD/CAE symbols

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TSSOP (PW) 28 View options

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