nRF5 SDK Maintenance mode

Software development kit for the nRF52 Series and nRF51 Series SoCs

The nRF5 SDK is in maintenance mode, see nRF Connect SDK and nRF5 SDK statement for more info. For new projects, we recommend the nRF Connect SDK.

The nRF5 SDK provides a rich developing environment for nRF51 and nRF52 Series SoCs. It includes a broad selection of drivers, libraries, examples, SoftDevices, and radio protocols.

The SDK is delivered as a plain .zip-archive, which makes it easy to install and gives you the freedom to choose the IDE and compiler.

All code examples included in the SDK are tailored to compile and run on Nordic Semiconductor's Development Kits.

Available Protocols

Rich and well tested development environment


Bluetooth® Low Energy brings wireless connectivity to small, low-cost devices that require months to years of battery lifetime.

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ANT™ is a proven, ultra low power, flexible and easy-to-use network protocol for 2.4 GHz ISM band communication.

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2.4 GHz

We offer a complete range of ultra-low power 2.4GHz ISM band solutions including wireless system-on-chips, protocol stacks, development tools, and reference designs.

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nRF52 Series SoCs

Supported by the nRF5 SDK

nRF52 SoftDevices

Bluetooth LE & ANT

nRF51 SoftDevices

Bluetooth LE & ANT


Supported by the nRF5 SDK and nRF52 DK


SES - Segger Embedded Studio

Segger Embedded Studio is a professional all-in-one IDE solution for embedded C/C++ programming. IDE, project manager, debugger and Clang/LLVM and GCC compilers included. Supports WIN, Linux, OSX.
Free for non-commercial use, without limitations.

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GNU Embedded Toolchain

The GNU Embedded Toolchain for ARM is a ready-to-use, open-source suite of tools for C/C++ and asm programming for Cortex-M and -R processors.  Includes GCC compiler/linker. WIN, Linux, OSX. Available directly from ARM and 100% Free to use under the GNU GPL.

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IAR Embedded Workbench

IAR Embedded Workbench for ARM provides one single toolbox, one view, one uninterrupted workflow. Includes IDE/editor, compiler, linker. WIN only.
Free Evaluation license available: Choose between 30-day fully functional trial or 32Kbyte code-size limited "kickstart" version.

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Keil MDK

KEIL Microcontroller Development Kit is a complete development environment for a wide range of Cortex-M based MCUs. Includes an IDE and debugger, ARM C/C++ compiler and linker and essential middleware components. WIN, Linux.
Free Evaluation/Lite version restricted to 32Kbytes of code and data. 7-day "full" trial also available.

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