J-Link ULTRA+ is an ultra fast debug probe for JTAG/SWD. It is 100% compatible with J-Link PLUS, just faster. Unplug your J-Link PLUS, plug in your J-Link ULTRA+ and enjoy the faster download speeds. It simply works!

J-Link ULTRA+ is a JTAG/SWD debug probe designed for ARM/Cortex. It is fully compatible to the standard J-Link and works with the same PC software.

Based on the highly optimized and proven J-Link, it offers even higher speed as well as target power measurement capabilities due to the faster CPU, built-in FPGA and High speed USB interface.


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Supported OS Microsoft Windows 2000, XP, 2003, Vista, 7 and newer (32 bit and 64 bit versions)
macOS 10.5 and higher
Electromagnetic compatibility (EMC) EN 55022, EN 55024
Operating temperature +5°C ... +60°C
Storage temperature -20°C ... +65 °C
Relative humidity (non-condensing) Max. 90% rH
Size (without cables) 100mm x 53mm x 27mm
Weight (without cables) 73g
Available Interfaces
USB interface USB 2.0, (Hi-Speed)
Target interface JTAG/SWD 20-pin
JTAG/SWD Interface, Electrical
Target interface voltage (VIF) 1.2V ... 5V
Current drawn from target voltage sense pin (VTRef) < 25µA
Target supply voltage 5V (derived from USB voltage)
Target supply current Max. 300mA
Reset type Open drain. Can be pulled low or tristated
Reset low level output voltage VOL <= 10% of VIF
For the whole target voltage range (1.2V <= VIF <= 5V)
LOW level input voltage (VIL) VIL <= 40% of VIF
HIGH level input voltage (VIH) VIH >= 60% of VIF
For 1.2V >= VIF <= 3.6V
LOW level output voltage (VOL) with a load of 10 kOhm VOL <= 20% of VIF
HIGH level output voltage (VOH) with a load of 10 kOhm VOH >= 80% of VIF
For 3.6 <= VIF <= 5V
LOW level output voltage (VOL) with a load of 10 kOhm VOL <= 20% of VIF
HIGH level output voltage (VOH) with a load of 10 kOhm VOH >= 80% of VIF
JTAG/SWD Interface, Timing
Target interface speed Max. 50 MHz
SWO sampling frequency Max. 100 MHz
Data input rise time (Trdi) Trdi <= 20ns
Data input fall time (Tfdi) Tfdi <= 20ns
Data output rise time (Trdo) Trdo <= 10ns
Data output fall time (Tfdo) Tfdo <= 10ns
Clock rise time (Trc) Trc <= 3ns
Clock fall time (Tfc) Trc <= 3ns
Analog power measurement interface
Sampling frequency 200 kHz
Resolution 50 uA
  • Download speed up to 3 MByte/s
  • Additional LEDs for power and RESET indication
  • 2 years of email support (J-Link BASE/PLUS: 1 year)
  • Superset of J-Link PLUS [More..]
  • Comes with integrated licenses for: Unlimited breakpoints in flash memory (Unlimited Flash Breakpoints), RDI / RDDI and J-Flash
  • Supports a broad range of microcontrollers: [More..]
  • Supports direct download into RAM and flash memory
  • Multiple CPUs supported—8051, PIC32, RX, ARM7/9/11, Cortex-M/R/A, RISC-V [More..]
  • Free software updates
  • Built-in VCOM functionality [More..]