SEGGER Microcontroller GmbH
SEGGER J-Link Pro PoE-Debugger
SEGGER J-Link Pro PoE-Debugger
SKU: 8.12.28
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Key Features
Overview
Overview
The J-Link PRO PoE is SEGGER's J-Link PRO class probe with IEEE 802.3af Power over Ethernet, built for test farms and CI rigs where each probe sits on the LAN rather than beside a PC. It connects by 100 Mbit/s Ethernet or USB 2.0 Hi-Speed, runs at up to 50 MHz target interface speed with download speeds up to 4 MB/s, supplies the target with 5.25V at up to 1000mA when PoE powered, and includes J-Flash, Unlimited Flash Breakpoints, Ozone and RDI licences. For Ethernet without PoE see the J-Link PRO.
How It Connects
This J-Link uses SEGGER's standard 20-pin 0.1" (2.54 mm) JTAG/SWD connector, used on every J-Link except the J-Link EDU mini. For SWD you need VTref (pin 1), SWDIO (pin 7), SWCLK (pin 9), nRESET (pin 15) and GND (pin 4), plus SWO (pin 13) if you want trace output. Full JTAG, SWD, cJTAG and SPI pin tables, and the adapters for 10-pin 0.05" Cortex Debug headers: SEGGER J-Link 20-pin connector pinout.
Downloads
User Manuals
Application Notes
SEGGER AN00016 Analyzing HardFaults on Cortex-M CPUsSEGGER application note on finding the cause of HardFaults on Cortex-M devices using a HardFault handler and a debugger to...
Details
SEGGER AN08005 Using RTT on Cortex-A/R Based DevicesSEGGER application note on using Real Time Transfer (RTT) with J-Link on Cortex-A and Cortex-R devices.
Details
SEGGER AN00021 Connecting J-Link to STM32 Discovery BoardsSEGGER application note on connecting a J-Link to STM32 Discovery evaluation boards in place of the on-board ST-LINK.
Details
Software
Why Engineers Choose the SEGGER J-Link Pro PoE-Debugger
Scale Test Farms Reliably
Accelerate Debug Cycles
Reduce Lab Complexity
The SEGGER J-Link PRO PoE (part number 8.12.28) is an Ethernet and USB JTAG/SWD debug probe powered over the network cable by IEEE 802.3af PoE (type 1, class 3), with up to 50 MHz target interface speed and download speeds up to 4 MB/s. When PoE powered it can supply the target with 5.25V at up to 1000mA, and it includes licences for J-Flash, Unlimited Flash Breakpoints, Ozone and RDI. SEGGER built it for test farms: automated, regression and continuous integration testing where each probe sits on the LAN rather than beside a PC.
Power over Ethernet for Test Farm Nodes
One Ethernet cable carries data and power, so each node in a rack needs no USB power supply. SEGGER's Test Farm reference design gives every node a J-Link PRO PoE, connected to the LAN through its Ethernet interface and can be powered from PoE switches where the LAN provides PoE. The device under test is connected to the probe by a USB cable so its power supply can be controlled, alongside a target adapter chosen to match its debug connector. On the probe itself, the USB-A port is listed as power only.
Ethernet and USB Host Interfaces
The probe connects by 100 Mbit/s Ethernet or USB 2.0 Hi-Speed. In delivery condition it is configured for DHCP, and a static address can be set with J-Link Configurator. A built-in web server on TCP port 80 gives configuration access from a browser. The Ethernet data lines are isolated to IEEE 802.3 at a 1500 Vrms test voltage for one minute.
50 MHz JTAG/SWD, Power Measurement and Licences
SEGGER lists the same speed and feature figures for the PRO PoE as for the J-Link PRO: up to 50 MHz target interface speed, SWO sampling up to 100 MHz, 1.2V to 5V target interface voltage and analogue power measurement at 200 kHz with 50µA resolution. The target uses the standard J-Link 20-pin 0.1" connector; see our SEGGER J-Link 20-pin connector pinout guide. The J-Link PRO feature list covers JTAG, cJTAG, SWD, SWD multi-drop, SWO, SPI, Microchip ICSP, Renesas FINE and Silicon Labs C2, with cores from Arm Cortex-M0 to Cortex-M85, Cortex-A and Cortex-R, RISC-V (SiFive, Andes, Codasip, Nuclei), Renesas RX, Microchip PIC32 and Silicon Labs EFM8. J-Flash is preinstalled, and RTT and VCOM are supported.
What Is in the Box
J-Link PRO PoE probe, 20-pin 0.1" ribbon cable and a USB cable. Mounting brackets are sold separately.
Specifications
| Host interfaces | 100 Mbit/s Ethernet; USB 2.0 Hi-Speed |
|---|---|
| Power over Ethernet | IEEE 802.3af PoE type 1, class 3 |
| Target connector | JTAG/SWD 20-pin, 0.1" (2.54mm); USB-A (power only) |
| Supported debug interfaces | JTAG, cJTAG, SWD, SWO, Microchip ICSP, Renesas FINE |
| Target interface voltage (VIF) | 1.2V to 5V |
| Current drawn from VTref | Less than 25µA |
| Target supply, PoE powered | 5.25V, max. 1000mA |
| Target supply, USB powered | 5V, max. 400mA |
| Target interface speed | Max. 50 MHz |
| SWO sampling frequency | Max. 100 MHz |
| Download speed | Up to 4 MB/s |
| Power measurement | 200 kHz sampling frequency, 50µA resolution |
| Ethernet isolation | Data lines to IEEE 802.3, 1500 Vrms for one minute |
| Included licences | J-Flash (preinstalled), Unlimited Flash Breakpoints, Ozone, RDI |
| Dimensions (without cables) | 123mm x 68mm x 30mm |
| Weight (without cables) | 125g |
| Operating temperature | +5°C to +60°C |
| Storage temperature | -20°C to +65°C |
| Relative humidity | Max. 90% rH, non-condensing |
| EMC | EN 55032, EN 55035 |
| Host OS | Windows and Linux (x86-64, Arm64); macOS (x86-64, Apple Silicon) |
Limitations
- PoE operation needs an IEEE 802.3af power source on the network side, such as a PoE switch; without one, power the probe from USB.
- The 1000mA target supply applies only when PoE powered; from USB the limit is 400mA.
- The Ethernet shield is not isolated; SEGGER specifies an unshielded twisted pair cable for effective isolation.
- No ETM trace on Cortex-M (use SEGGER J-Trace) and no QSPI target interface.
J-Link PRO PoE Compared with PLUS, ULTRA+ and PRO
| Model | Host interface | Download speed | Target interface speed | Ethernet | Power over Ethernet | Supported cores | Price ex VAT |
|---|---|---|---|---|---|---|---|
| J-Link PLUS Classic | USB 2.0 Hi-Speed | Up to 1 MB/s | Up to 15 MHz | No | No | Arm Cortex-M/A/R, RISC-V, Renesas RX, PIC32, EFM8 | £660 |
| J-Link ULTRA+ (J-Link Ultra) | USB 2.0 Hi-Speed | Up to 4 MB/s | Up to 50 MHz | No | No | Arm Cortex-M/A/R, RISC-V, Renesas RX, PIC32, EFM8 | £870 |
| J-Link PRO | USB 2.0 Hi-Speed and 100 Mbit/s Ethernet | Up to 4 MB/s | Up to 50 MHz | Yes | No | Arm Cortex-M/A/R, RISC-V, Renesas RX, PIC32, EFM8 | £1,100 |
| J-Link PRO PoE (this product) | USB 2.0 Hi-Speed and 100 Mbit/s Ethernet | Up to 4 MB/s | Up to 50 MHz | Yes | Yes, IEEE 802.3af | Arm Cortex-M/A/R, RISC-V, Renesas RX, PIC32, EFM8 | £1,320 |
Typical Applications
A rack of PRO PoE probes on a PoE switch, each flashing and testing one STM32 or nRF board per CI build, with the device under test power-cycled between runs. Regression testing of Cortex-M33 firmware on a remote bench reached over the LAN. Overnight soak tests where the probe reports RTT logs from a target that nobody is sitting next to.
For a single desk with USB, the ULTRA+ gives the same 50 MHz and 4 MB/s figures; the J-Link PRO adds Ethernet without PoE.
Order the J-Link PRO PoE for £1,320 ex VAT. Ask us for a formal quotation for a test farm quantity, or check your part number against SEGGER's supported devices list. See the full range in our SEGGER debug probes collection.
Frequently Asked Questions
Can the J-Link PRO PoE Run Without a PoE Switch?
Yes. It can also be powered from USB. The target supply is then 5V at up to 400mA, rather than 5.25V at up to 1000mA under PoE.
Answered by John Legg, Director, Debug Store
How Does the Probe Get an IP Address?
By DHCP. In delivery condition the probe is configured for DHCP; for a direct connection to a host PC without DHCP, a static IP address can be set with J-Link Configurator.
Answered by John Legg, Director, Debug Store
Last reviewed: 30 October 2026
| Ordering information | |
|---|---|
| Part number (SKU) | 8.12.28 |
| Manufacturer | SEGGER Microcontroller GmbH |
| EAN | 5055383619863 |
| Warranty | 12 Monate |
| Shipping weight | 0.5 kg |
- 1 ×J-Link PRO PoE debug probe
- 1 ×USB cable
- 1 ×20-pin ribbon cable, 2.54 mm (0.1 in) pitch, 18 cm
Questions and Answers
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Do I Need Special Software Licences?
No. Unlimited Flash Breakpoints, J-Flash, Ozone and J-Link GDB Server are included in the J-Link Software & Documentation Pack.
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Does It Work with My IDE?
J-Link integrates with major IDEs and debuggers on Windows, Linux, and macOS via the J-Link DLL or GDB Server.
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Can I Access It Remotely Over the Network?
Yes. Use Ethernet and SEGGER’s Remote Server for LAN/WAN access. PoE simplifies remote placement in racks and enclosures.
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What Are Related Alternatives in the J-Link Range?
For compact USB with power measurement, see the J-Link Ultra. For streaming trace and coverage, see J-Trace.
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What Makes J-Link PRO PoE Suited to Test Farms?
PoE power plus switchable target power let you deploy many probes with one cable each and power-cycle DUTs remotely. For non-PoE Ethernet, see the J-Link Pro.
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Can It Power the Target Device?
Yes. When PoE-powered, the probe can supply target power via the debug header or USB-A, enabling scripted power-cycles during automated tests.
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How Fast Is Programming?
Up to 4 MB/s into RAM (target-dependent). This reduces turnaround between builds during CI and interactive debugging.
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Does It Support SWD, JTAG, and SWO?
Yes. It supports standard Arm JTAG/SWD; SWO is available on supported MCUs for printf-style logging and event tracing.
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How Does PRO PoE Differ From J-Link PRO?
Functionally similar, but PRO PoE adds PoE power, a USB-A power output and a higher-current target supply (up to 1 A when PoE-powered) for farm use.
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