Jlink V9 Schematic May 2026

Introduction The Segger J-Link is arguably the most ubiquitous family of debug probes in embedded systems development. Supporting thousands of microcontrollers (ARM Cortex-M, RISC-V, Renesas RX, etc.), its speed and stability have made it an industry standard. Among the various versions, the J-Link V9 (often referred to as "EDU" or "Base" depending on firmware) occupies a special place in the hacker and hobbyist community. Released around 2014–2015, the V9 was the last version before Segger introduced significant hardware-based encryption and anti-cloning measures in V10 and V11.

| Component | Part Number | Role | | :--- | :--- | :--- | | MCU | LPC4322FBD144 | Main processor | | Crystal | 12 MHz (or 25 MHz) | Clock source for USB PLL | | LDO | MIC5205-3.3 | 3.3V regulation | | Level Shifter | SN74LVC2T45 (x2) | SWDIO and SWCLK direction control | | ESD | PRTR5V0U2X | USB line protection | | Buffer | 74LVC1G07 | Reset output (open drain) | | Resistors | 10k pull-ups on SWDIO, nRESET | Define idle states | jlink v9 schematic

The J-Link V9 is a masterpiece of debug tool engineering, but its schematic is a ghost—widely sought, yet only legally useful for understanding the past, not building the future. Disclaimer: This article is for educational purposes only. The author does not provide or distribute schematics for Segger products. All trademarks are property of their respective owners. Introduction The Segger J-Link is arguably the most

Building one clone for personal education is legally gray but practically ignored. Selling 1,000 units will result in a lawsuit. A Hypothetical Schematic Breakdown (For Reference) If you were to design a compatible debug probe from scratch (not a clone), here is the minimum viable schematic you would need: Released around 2014–2015, the V9 was the last