SEGGER Microcontroller GmbH
SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe
SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe
SKU: 8.16.28
Verfügbarkeit für Abholungen konnte nicht geladen werden
Key Features
Overview
Overview
The J-Link ULTRA+ (listed by SEGGER as J-Link Ultra) is a USB-C JTAG/SWD debug probe with up to 50 MHz target interface speed and download speeds up to 4 MB/s, against 15 MHz and 1 MB/s for the J-Link PLUS. It adds target power measurement at 200 kHz with 50µA resolution, includes J-Flash, Unlimited Flash Breakpoints, Ozone and RDI licences, and debugs Arm Cortex-M, Cortex-A and Cortex-R, RISC-V, Renesas RX and Microchip PIC32 targets at 1.2V to 5V. For Ethernet access 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
Why Engineers Choose the SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe
Throughput That Saves Time
Licences Included
Power Insight Built-In
The SEGGER J-Link ULTRA+ (part number 8.16.28, listed by SEGGER as J-Link Ultra) is a USB JTAG/SWD debug probe with up to 50 MHz target interface speed, download speeds up to 4 MB/s and a 1.2V to 5V target interface. It adds analogue power measurement at 200 kHz with 50µA resolution, and includes licences for J-Flash, Unlimited Flash Breakpoints, Ozone and RDI. It suits firmware teams who flash large images many times a day on Arm Cortex, RISC-V, Renesas RX and Microchip PIC32 targets and want to see current draw while they debug.
High-Speed JTAG/SWD Against the J-Link PLUS
SEGGER quotes up to 4 MB/s download speed and up to 50 MHz target interface speed for the ULTRA+, against up to 1 MB/s and 15 MHz for J-Link BASE and PLUS. SEGGER describes it as 100% compatible with J-Link PLUS, just faster, so existing J-Link projects and scripts carry over unchanged. Actual flash programming time depends on the target device. SWO is sampled at up to 100 MHz.
Power Measurement While You Debug
The ULTRA+ measures target current at a 200 kHz sampling frequency with 50µA resolution. On low-power designs that shows current spikes and sleep-mode entry during a debug session; with 50µA resolution it does not replace a dedicated meter for microamp sleep current. The probe can also supply the target with 5V at up to 300mA from the USB rail.
Interfaces, Supported Cores and Licences
The host link is USB 2.0 Hi-Speed over USB-C. The target uses the standard J-Link 20-pin 0.1" connector; pin assignments and adapters are in our SEGGER J-Link 20-pin connector pinout guide. Supported debug interfaces are JTAG, cJTAG, SWD, SWD multi-drop, SWO, SPI, Microchip ICSP, Renesas FINE and Silicon Labs C2. SEGGER's cores list covers Arm Cortex-M0 to Cortex-M85, Cortex-A and Cortex-R, legacy ARM7 to ARM11, RISC-V cores from SiFive, Andes, Codasip and Nuclei, Renesas RX, Microchip PIC32, Silicon Labs EFM8 and Cadence Tensilica Xtensa. J-Flash, Unlimited Flash Breakpoints, Ozone and RDI licences are included, along with RTT and VCOM (pins 5 and 17, SWD only).
Software and IDE Compatibility
J-Link software is free of charge, on Windows and Linux (x86-64 and Arm64) and macOS (x86-64 and Apple Silicon). SEGGER lists support in SEGGER Embedded Studio, Eclipse, IAR EWARM, Keil MDK-ARM, STM32CubeIDE, MCUXpresso and Visual Studio Code, among others.
What Is in the Box
J-Link ULTRA+ probe, 20-pin 0.1" ribbon cable and a USB-C cable.
Specifications
| Host interface | USB 2.0 Hi-Speed, USB-C |
|---|---|
| Target connector | JTAG/SWD 20-pin, 0.1" (2.54mm) |
| Supported debug interfaces | JTAG, cJTAG, SWD, SWD multi-drop, SWO, SPI, Microchip ICSP, Renesas FINE, Silicon Labs C2 |
| Target interface voltage (VIF) | 1.2V to 5V |
| Current drawn from VTref | Less than 25µA |
| Target supply | 5V (derived from USB), max. 300mA |
| 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 |
| Included licences | J-Flash, Unlimited Flash Breakpoints, Ozone, RDI |
| Dimensions (without cables) | 72mm x 45mm x 18mm |
| Weight (without cables) | 40g |
| 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
- USB only. For Ethernet access choose the J-Link PRO, or the J-Link PRO PoE for Power over Ethernet.
- The 50 MHz and 4 MB/s figures are maximums; the usable interface clock and flash programming rate depend on the target device.
- No ETM trace on Cortex-M (use SEGGER J-Trace) and no QSPI target interface.
- VCOM is available only when debugging over SWD.
J-Link ULTRA+ Compared with PLUS 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 | €828,95 |
| J-Link ULTRA+ (J-Link Ultra, this product) | 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 | €1.091,95 |
| 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 | €1.380,95 |
| J-Link PRO PoE | 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 | €1.656,95 |
Typical Applications
Repeated download of multi-megabyte images to Cortex-A or Cortex-M7 targets with external flash during development. Watching active current and wake-up spikes on an nRF or STM32L low-power design while stepping through code; microamp sleep current still needs a dedicated meter. Debug at 50 MHz SWD on fast Cortex-M33 parts where a 15 MHz probe is the bottleneck.
Choose the J-Link PRO or PRO PoE instead if the probe must sit on a network rather than a USB port.
Order the J-Link ULTRA+ for €1.091,95 ex VAT. Check your part number against SEGGER's supported devices list, or ask us for a formal quotation. See the full range in our SEGGER J-Link debug probes collection.
Frequently Asked Questions
Is the J-Link ULTRA+ the Same as the J-Link Ultra?
Yes. SEGGER now lists part 8.16.28 as J-Link Ultra and describes it as formerly the J-Link ULTRA+. Specifications on this page are taken from SEGGER's J-Link Ultra page.
Answered by John Legg, Director, Debug Store
Last reviewed: 30 October 2026
Sources (8 manufacturer pages)
| Ordering information | |
|---|---|
| Part number (SKU) | 8.16.28 |
| Manufacturer | SEGGER Microcontroller GmbH |
| EAN | 5055383614691 |
| Warranty | 12 Monate |
| Shipping weight | 0.5 kg |
- 1 ×J-Link Ultra debug probe
- 1 ×USB cable
- 1 ×20-pin ribbon cable, 2.54 mm (0.1 in) pitch, 18 cm
SEGGER now sells the J-Link ULTRA+ under the name J-Link Ultra.
Questions and Answers
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What Operating Systems Are Supported?
Windows, Linux and macOS (including Apple Silicon) are supported with the J-Link Software & Documentation Pack.
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Does ULTRA+ Include Unlimited Flash Breakpoints?
Yes, the licence is included, enabling more than the MCU’s hardware breakpoint limit when debugging in flash.
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Can ULTRA+ Power a Target Board?
Yes, via the 20-pin header’s 5 V output (up to 300 mA), useful for small targets and evaluation boards.
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Is SWO Supported for Real-Time Logs?
Yes. SWO is supported (with high sampling rates) for printf-style logging and event tracing on supported MCUs.
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Which Tool Should I Choose If I Need Ethernet and Remote Use?
Consider the SEGGER J-Link PRO for Ethernet and remote workflows.
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Does J-Link ULTRA+ Support My Arm Cortex-M Target?
Yes, it supports a wide range of ARM Cortex devices and more. Check the official supported devices list for specifics.
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How Fast Is Flash Programming with ULTRA+ in Practice?
The probe supports downloads up to 4 MB/s into RAM. Actual speed depends on the MCU, flash and memory algorithm performance.
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Is ETM Instruction Trace Available on ULTRA+?
No. For ETM streaming trace and code coverage, use the SEGGER J-Trace PRO.
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How Is ULTRA+ Different From J-Link PLUS?
The ULTRA+ is 100% compatible with the J-Link PLUS but adds higher speed and power measurement. Both include the J-Link software ecosystem.
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How Does ULTRA+ Compare to Lauterbach Tools?
Lauterbach is a third-party manufacturer, so refer to its documentation for its trace features. ULTRA+ focuses on fast JTAG/SWD debug with integrated power profiling and does not provide ETM instruction trace (that needs a J-Trace).
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