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SEGGER Microcontroller GmbH

SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe

SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe

4 MB/s downloads, up to 50 MHz JTAG/SWD, power profiling and VCOM for professional Arm Cortex debugging.
SKU: 8.16.28
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m.2,029.00 AZN exc tax
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Key Features

4 MB/s Flash & RAM Downloads
Up To 50 MHz JTAG/SWD
Unlimited Flash Breakpoints Licence
Built-In Power Profiling
Virtual COM (VCOM) Interface
Broad IDE & OS Support
SWO Support (Up To 100 MHz Sampling)

Overview

The SEGGER J-Link ULTRA+ is a high-performance JTAG/SWD debug probe for Arm® Cortex-A/R/M and selected other cores. It delivers up to 4 MB/s download speed and supports target interface clocks up to 50 MHz, enabling rapid flash programming and responsive debug sessions.

Included Software & Licences

ULTRA+ comes with licences for Unlimited Flash Breakpoints, J-Flash, RDI/RDDI and the Ozone debugger, plus the J-Link GDB Server. Multi-platform host support (Windows, Linux and macOS) and broad IDE compatibility simplify integration into existing workflows.

Power & Trace-Related Capabilities

Built-in power measurement (up to 200 kSa/s, 50 µA resolution) helps profile low-power designs. SWO is supported, and a virtual COM (VCOM) interface provides convenient target UART over USB. For instruction trace via ETM, consider SEGGER J-Trace PRO.

Related Models

Within the J-Link family, engineers may also consider J-Link PLUS (same software ecosystem) or J-Link PRO (adds Ethernet and high-duty production use). Choosing ULTRA+ provides higher speed and power profiling in a compact USB probe.

Why Consider ULTRA+

ULTRA+ pairs proven J-Link reliability with faster downloads, advanced software features and integrated power profiling—ideal for professional teams needing measurable throughput gains and actionable power insights.

Throughput That Saves Time

4 MB/s downloads and up to 50 MHz SWD/JTAG minimise flash cycles and speed iterative debug.

Licences Included

Unlimited Flash Breakpoints, J-Flash and Ozone reduce extra tooling costs and setup friction.

Power Insight Built-In

Integrated current measurement surfaces energy hotspots early, aiding low-power optimisation.

Frequently Asked Questions

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  • Which tool should I choose if I need Ethernet and remote use?

    Consider the SEGGER J-Link PRO for Ethernet, higher duty cycles and remote workflows.

  • 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.

  • 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.

  • Does ULTRA+ include Unlimited Flash Breakpoints?

    Yes, the licence is included, enabling more than the MCU’s hardware breakpoint limit when debugging in flash.

  • What operating systems are supported?

    Windows, Linux and macOS (including Apple Silicon) are supported with the J-Link Software & Documentation Pack.

  • How does ULTRA+ compare to more expensive Lauterbach tools?

    Lauterbach excels at high-end ETM/PTM trace analytics; ULTRA+ focuses on fast JTAG/SWD debug with integrated power profiling.

  • How is ULTRA+ different from J-Link PLUS?

    The ULTRA+ is 100% compatible but adds higher speed and power measurement; both include the J-Link software ecosystem.

  • Is ETM instruction trace available on ULTRA+?

    No. For ETM streaming trace and code coverage, use the SEGGER J-Trace PRO.

  • How fast is flash programming with ULTRA+ in practice?

    The probe supports up to 4 MB/s downloads; actual speed depends on MCU, flash, and memory algorithm performance.

  • 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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