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Model Overview

The following tables show the features which are included in each J-Link / J-Trace model.

Hardware features

Hardware features like Ethernet interface, USB full- / high-speed interface, etc. are J-Link model specific features which can not be updated or changed by software updates.

  J-Link BASE J-Link PLUS J-Link ULTRA+ J-Link PRO J-Trace for Cortex-M J-Trace PRO for Cortex-M
Download speed
into RAM1
1.0 MByte/sec 1.0 MByte/sec 3.0 MByte/sec 3.0 MByte/sec 3.0 MByte/sec 3.0 MByte/sec
Max. target interface speed 15 MHz 15 MHz 50 MHz 50 MHz 25 MHz 50 MHz
Max. SWO speed 7.5 MHz 7.5 MHz 100 MHz 100 MHz 25 MHz 100 MHz
Ethernet no no no no
JTAG interface
SWD interface
SWO interface
Microchip ICSP®
no no
Renesas FINE interface no no
ETM Trace no no no no
ETB Trace
Unlimited Streaming Trace + Live Analysis5 no no no no no

Supported          no Not supported

Software features

Software features are features implemented in the software primarily on the host. Software features can either come with the J-Link or be added later using a license string from Segger.

  J-Link BASE J-Link PLUS J-Link ULTRA+ J-Link PRO J-Trace for Cortex-M J-Trace PRO for Cortex-M
GDB Server
Flash Download2
Unlimited Flash Breakpoints3

Supported          Optional, an additional license is required


Supported cores

Support for additional / new cores may be added to existing J-Link models with a new firmware version as far as the exisiting J-Link hardware allows it.

  J-Link BASE J-Link PLUS J-Link ULTRA+ J-Link PRO J-Trace
for Cortex-M
J-Trace PRO for Cortex-M
ARM legacy cores
ARM7 no no
ARM9 no no
ARM11 no no
ARM Cortex cores
Cortex-A5 no no
Cortex-A7 no no
Cortex-A8 no no
Cortex-A9 no no
Cortex-A12 no no
Cortex-A15 no no
Cortex-A17 no no
Cortex-R4 no no
Cortex-R5 no no
SC000 (M0 secure)
SC300 (M3 secure)
Microchip PIC32
Microchip PIC32MX no no
Microchip PIC32MZ no no
Renesas RX
Renesas RX110 no no
Renesas RX111 no no
Renesas RX210 no no
Renesas RX21A no no
Renesas RX220 no no
Renesas RX610 no no
Renesas RX621 no no
Renesas RX62G no no
Renesas RX62N no no
Renesas RX62T no no
Renesas RX630 no no
Renesas RX631 no no
Renesas RX63N no no
Renesas RX63T no no

Debug support: Run control, memory access, etc          Trace supported          no Not supported



1 The download speeds listed here are the peak download speeds that can be achieved by the particular J-Link model. The actual download speed may be lower as it depends on various factors, such as, but not limited to: The selected debug interface & speed, the CPU core and its operating frequency, other devices in the JTAG chain in case JTAG is used as target interface.
2 Most IDEs come with their own flashloaders, so in most cases this feature is not essential for debugging your applications in flash. The J-Link flash download (FlashDL) feature is mainly used in debug environments where the debugger does not come with an own flashloader (e.g. the GNU Debugger). For more information about flash download, please refer to Flash Download.
3 The Unlimited Flash Breakpoint feature allows setting an unlimited number of breakpoints even if the application program is not located in RAM, but in flash memory. Without this feature, the number of breakpoints which can be set in flash is limited to the number of hardware breakpoints (typically two for ARM 7/9, six for Cortex-M3). For more information about flash breakpoints, please refer to Unlimited Flash Breakpoints.
4 Infineon specific single-pin debug interface. Currently available for Infineon XMC1000 series devices only.
5 Unlimited streaming trace allows to transmit trace in real-time to the PC . While traditional trace only allows to see and analyze the last xxx MB of trace data, with streaming trace it is possible to have all data available. This allows extended debugging features like code coverage, CPU load analysis based on a function basis, ...