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SEGGER J-Links are the most widely used line of debug probes available today. They've been proven for more than 10 years with over 250,000 units sold, including OEM versions and on-board solutions. This popularity stems from the unparalleled performance, extensive feature set, large number of supported CPUs, and compatibility with all popular development environments.

With up to 3 MBytes/s download speed to RAM and record breaking flashloaders, as well as the ability to set an unlimited number of breakpoints in flash memory of MCUs, the J-Link debug probes are undoubtedly the best choice to optimize your debugging and flash programming experience.
  J-Link Debug Probes
  J-Link debug probes support all ARM 7/9/11, CortexT, Renesas RXT CPUs and are supported by all major IDEs such as IAR EWARM, Keil MDK,Rowley CrossWorks, Atollic TrueSTUDIO, IAR EWRX,Renesas HEW, Renesas e2studio, including GDB based IDEs, and many others.

Wifi based Segger JLINK, a new member of the J-Link family of debug probes With USB and Wi-Fi interfaces, any software compatible with J-Link can easily use the new model. Removing the physical connection between J-Link and the host opens up a world of new possibilities: A robot, vehicle, drone, or other devices with moving parts can be monitored or debugged on the move or from a distance. Physical disconnection provides the ultimate in electrical isolation where desired, and J-Link over Wi-Fi is perfect for accessing air-sealed environments.
  Debug smarter and faster with J-Link debug probes!  
  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 ARM
Download speed
into RAM1
1.0 MByte/sec 1.0 MByte/sec 3.0 MByte/sec 3.0 MByte/sec 3.0 MByte/sec 1.0 MByte/sec
Max. target interface speed 15 MHz 15 MHz 50 MHz 50 MHz 25 MHz 12 MHz
Max. SWO speed 7.5 MHz 7.5 MHz 100 MHz 100 MHz 25 MHz -
JTAG interface
SWD interface
SWO interface
Microchip ICSP
Renesas FINE interface
ETM Trace
ETB Trace
Not Included
  J-Link BASE J-Link PLUS J-Link ULTRA+ J-Link PRO J-Trace for Cortex-M J-Trace ARM
GDB Server
Flash Download2
Unlimited Flash Breakpoints3
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 ARM

ARM legacy cores


ARM Cortex cores

SC000 (M0 secure)
SC300 (M3 secure)

Microchip PIC32

Microchip PIC32MX
Microchip PIC32MZ

Renesas RX

Renesas RX110
Renesas RX111
Renesas RX210
Renesas RX21A
Renesas RX220
Renesas RX610
Renesas RX621
Renesas RX62G
Renesas RX62N
Renesas RX62T
Renesas RX630
Renesas RX631
Renesas RX63N
Renesas RX63T
Debug support: Run control, memory access, etc
Trace supported
Not supported
  For use from within an IDE Best value: Includes all software enhancements and maximum performance  
  Educational use  
  Price does not include VAT or Sales Tax which may be applicable in some regions Cortex-M3,4 cores only ARM 7/9 cores only 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.  
  For customers who want to build their own applications using J-Link, and for IDE vendors who implement J-Link support for their IDE, SEGGER offers a J-Link SDK which comes with the J-Link DLL + API documentation + implementation samples. The SDK is available for Windows and Linux.

Remote Server Debugging in Tunnel Mode

The J-Link Remote Server effortlessly debugs target hardware and application in remote locations over TCP/IP as if the target was on the developer's desk. Taking this concept to the next level, SEGGER offers a tunnel mode for remote debugging anywhere in the world.

Tunnel mode initiates the connection sending the serial number of the J-Link to the tunnel server. The J-Link DLL then is capable of creating a tunnel connection via the server just by using the serial number of the target J-Link.

Support engineers can debug unwieldy hardware at the customer's site without having to travel there, just by sending a J-Link. Distributed development teams can share early prototypes even in remote locations.
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J-Trace PRO for Cortex-M is setting a new standard for trace probes. It enables continuous streaming trace, lifting the limitations by internal buffers and slow data transmission to give you all the insights you need to develop and optimize your code.

J-Trace PRO can capture complete traces over long periods-thereby enabling the recording of infrequent, hard-to-reproduce bugs. This is particularly helpful when the program flow 'runs off the rails' and stops in a fault state.

It also supports extended trace features, such as code coverage (so engineers have visibility over
  J-Trace PRO
  which parts of the application code have been executed) and execution profiling (providing visibility as to which instructions have been executed and how often-so hotspots can be addressed and optimization opportunities identified).  
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