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J-Link is a USB JTAG dongle from the company Segger. It is very commonly bundled with evaluation boards from some other companies.


  • Atmel AT91SAM7 ARM 7 microcontroller
    • This allows the dongle to do low-level JTAG communication actions in high speed without involvement from the PC. This is faster compared to bitbanging done in the commonly used FT2232 based JTAG dongles.
  • Two ALVC164245 levelshifter transceivers
    • This provides support for 1.2V-3.3V targets and 5V tolerance.


Segger J-Link V8.0 PCB front
Segger J-Link V8.0 PCB back