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USB 480 Mbit/s, JTAG, SWD, SWT

Emulator for ARM7/9, Cortex and Renesas RX cores

J-Link ULTRA+ is a JTAG/SWD emulator designed for ARM/Cortex and other supported CPUs. 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. 

It connects via USB to a PC running Microsoft Windows 2000, Windows XP, Windows 2003, Windows Vista or Windows 7. J-Link ULTRA+ has a built-in 20-pin JTAG/SWD connector and comes with licenses for Unlimited Flash Breakpoints, RDI / RDDI and J-Flash


  • Comes with integrated licenses for: Unlimited breakpoints in flash memory (Unlimited Flash Breakpoints), RDI / RDDI and J-Flash
  • Fully compatible to the standard J-Link
  • Very high performance for all supported CPU cores
  • Download speed up to 3 MByte/second
  • Hi-Speed USB 2.0 interface
  • Serial Wire Debug (SWD) supported
  • Serial Wire Viewer (SWV) supported
  • Maximum target interface speed 50 MHz
  • Maximum SWO sampling speed 100 MHz
  • Target power can be supplied
  • Target power consumption can be measured with high accuracy.
  • Direct download into flash memory of most popular microcontrollers supported
  • Supported CPUs: Any ARM7/9/11, Cortex-A5/A8/A9, Cortex-M0/M1/M3/M4, Cortex-R4, Microchip PIC32 and Renesas RX100/RX200/RX610/RX621/RX62N/RX62T/RX630/RX631/RX63N
  • Free software updates 1, 2 years of support
  • Automatic core recognition
  • Seamless integration into the IAR Embedded Workbench IDE
  • No power supply required, powered through USB
  • Support for adaptive clocking
  • All JTAG signals can be monitored, target voltage can be measured
  • Support for multiple devices
  • Fully plug and play compatible
  • Standard 20-pin JTAG connector
  • Wide target voltage range: 1.2V - 3.3V, 5V tolerant
  • USB and 20-pin ribbon cable included
  • Memory viewer (J-Mem) included
  • Remote Server included, which allows using J-Link via TCP/IP networks
  • RDI / RDDI interface available, which allows using J-Link with RDI / RDDI compliant software
  • Flash programming software (J-Flash) available
  • Flash DLL available, which allows using flash functionality in custom applications
  • Software Developer Kit (SDK) available
  • Embedded Trace Buffer (ETB) support
  • Optical isolation adapter available
  • Target power supply: J-Link can supply up to 300 mA to target with overload protection

1As a legitimate owner of a SEGGER J-Link, you can always download the latest software free of charge. Though not planned and not likely, we reserve the right to change this policy. Note that older models may not be supported by newer versions of the software. Typically, we support older models with new software at least 3 years after end of life.

Supported OS Microsoft Windows 2000
Microsoft Windows XP
Microsoft Windows XP x64
Microsoft Windows 2003
Microsoft Windows 2003 x64
Microsoft Windows Vista
Microsoft Windows Vista x64
Windows 7
Windows 7 x64
Windows 8
Windows 8 x64
Mac OSX 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 4.5V ... 5V
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 <= 10% of VIF
HIGH level output voltage (VOH) with a load of 10 kOhm VOH >= 90% 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
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