SEGGER Microcontroller GmbH
SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe
SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe
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Key Features
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.
Why Engineers Choose The SEGGER J-Link ULTRA+ Ultra-Fast JTAG/SWD Debug Probe
Throughput That Saves Time
Licences Included
Power Insight Built-In
Frequently Asked Questions
Have a Question?
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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.
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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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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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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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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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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.
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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.
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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 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.
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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.