SEGGER J-Link OB ARM Emulator, Debugger and Programmer
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Prices updated: 12 Oct 2026
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About this product
J-Link OB is an on-board debug probe and programmer for ARM microcontrollers. It connects to the PC over USB and to the target through JTAG or SWD, with SWO support for trace output. It is used for flashing firmware and debugging ARM Cortex-based projects, including many STM32 boards.
Specifications
- Debug interfaces
- JTAG, SWD, SWO
- Host connection
- USB
- Target architecture
- ARM
- Type
- On-board debugger and programmer
Frequently asked questions
Which microcontrollers does it support?
It supports ARM-based targets that expose a JTAG or SWD debug interface, such as many STM32 chips.
How do I wire it to a target board for SWD?
Connect SWDIO, SWCLK and GND, and optionally SWO for trace. Connect the target voltage reference to match the target's logic level.
