JLINK V9.4 Stable Edition – High-Speed Debugger/Programmer for STM32 MCUs | Includes Board, 7 Cables & 40-Pin Ribbon Wire

SKU: FA1057-2
Connectivity

PC Interface USB 2.0 (Full Speed)
Supported Cores

ARM 7/9/11, Cortex-M/A/R Including STM32, NXP, TI, etc.
Voltage Range

1.2 V to 3.3 V 5 V tolerant inputs
JTAG Speed

Up to 12 MHz (JTAG interface)
SWD Speed

Up to 15 MHz (SWD interface)
Power Output

Can supply up to 300mA to the target board (selectable)
ESD Protection

Integrated high-grade electrostatic protection circuit
Product Description
The J-Link V9.4 Stable Edition is a high-performance, professional-grade JTAG/SWD debugger and programmer, renowned globally as an industry-standard tool for developing ARM Cortex-M, Cortex-A, Renesas RX, and other embedded microcontrollers.
This specific Stable Edition is assembled using high-quality components to ensure robust performance, stability, and longevity in demanding development environments. While designed to be a cost-effective alternative to the official Segger original, it maintains the core functionality, high-speed debugging capabilities, and universal compatibility that engineers require. The included comprehensive accessory kit (main board, 7 cables, and 40-pin ribbon) ensures you have the necessary interfaces for immediate plug-and-play operation across various target boards.
It is an indispensable tool for accelerating code development, flashing large binaries rapidly, and performing advanced debugging tasks in real-time.
Key Features
  • Universal Compatibility: Supports virtually all ARM7/9/11, Cortex-A5/A8/A9, Cortex-M0/M0+/M1/M3/M4/M7, and Cortex-R4/R5 MCUs.
  • High-Speed USB 2.0: Delivers rapid flash programming and seamless real-time debugging experiences.
  • Robust JTAG & SWD Support: Auto-detection of core speed and intelligent buffering for reliable communication.
  • Advanced Debugging Features: Supports Serial Wire Viewer (SWV) tracing for Cortex-M devices.
  • Voltage Flexibility: Wide target voltage range from 1.2V to 3.3V, compatible with 5V tolerant targets.
  • Comprehensive Kit: Includes the main V9.4 board, a full suite of accessory cables, and a 40-pin ribbon wire for diverse connection requirements.
  • Firmware: Built with stable, high-quality components designed to accept standard V9 firmware versions.
Usage Instructions
  1. Software Installation: Download and install the official J-Link Software and Documentation Pack from the Segger website. This pack includes the necessary drivers and utilities.
  2. Driver Installation: Connect the J-Link V9.4 to your PC via USB. Follow the prompts to install the drivers.
  3. Target Connection: Connect the appropriate ribbon cable to your target board (e.g., the 20-pin JTAG header or the 10-pin SWD header). Ensure the target board’s power supply is within the supported 1.2V–3.3V range.
  4. IDE Configuration: Open your preferred IDE (Keil MDK, IAR EWARM, STM32CubeIDE, VS Code with PlatformIO, etc.). In the debugger settings, select “J-Link” as your hardware probe.
  5. Target Power: The V9.4 unit can optionally provide power (3.3V/5V selection jumper) to the target board if needed. Verify jumper settings before connecting.
  6. Start Debugging: Hit the “Connect” or “Start Debugging/Flashing” button within your software environment.
Q: Is this a genuine Segger product?

This “Stable Edition” is a high-quality, fully functional compatible alternative widely used in the Asian market. It utilizes high-grade components to mimic the stability and performance of the official J-Link V9. It operates using the standard Segger drivers and software.

Q: Which microcontrollers does this support?

It is a universal ARM debugger. It supports all common STM32 chips (F0, F1, F2, F3, F4, F7, H7 series), as well as NXP, TI, Renesas, Silicon Labs, and more, provided they use the ARM architecture (Cortex-M/A/R).

Q: Can this unit supply power to my development board?

Yes, the V9.4 model includes jumpers allowing you to configure the output pins to supply 3.3V or 5V to the target board, up to 300mA.

Q: I am a business customer. Is this suitable for high-volume production programming?

The J-Link hardware is capable of production programming via command-line tools. However, business users are highly encouraged to review the official Segger licensing agreements, as official Segger software licenses may require the use of their certified original hardware for commercial purposes.

Q: What is included in the package?
The package includes: The J-Link V9.4 main board, one USB cable, 7 assorted wiring cables, and one 40-pin IDC ribbon cable for various board connections.

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