News Briefs

Micrium µC/ RTOS Software Now Available Through Open-Source Licensing

-- Developers Gain Access to Full Suite of Leading Embedded RTOS Software Components at No Cost --


AUSTIN, Texas – Jan. 27, 2020Silicon Labs (NASDAQ: SLAB) announces a new open-source licensing model for Micrium µC/ family of RTOS components. By adopting permissive license terms for the µC/ components, Silicon Labs is extending the benefits of µC/ software to the widest user base possible and giving the embedded developer community a role in future software development efforts.


Silicon Labs plans to ensure a smooth transition to open-source terms for all licensees of µC/ software. The company will continue to provide technical support for customers with valid maintenance agreements. Silicon Labs is also working closely with partners who may offer similar support services in the near future.


The new open-source µC/ license model will go into effect on February 28, 2020. The open-source license applies to all  µC/ software components including  µC/OS-II, µC/OS-III, µC/FS, µCC/TCP-IP, µC/USB-Device, µC/USB-Host, µC/CAN and µC/Modbus.


The open-source licensing change does not affect Silicon Labs’ exclusive Micrium OS software optimized for the company’s products and available to developers through Simplicity Studio. Micrium OS is designed to be used commercially by customers on Silicon Labs’ EFR32 wireless SoCs and EFM32 microcontrollers (MCUs) with no licensing fees. Although it is not open source, Micrium OS source code is available to Silicon Labs customers.


“The µC/ family of RTOS components has been a fixture in the embedded market for many years, and open-source licensing represents the next phase in the evolution of this popular software,” said Riku Mettala, vice president of IoT software and tools at Silicon Labs. “This new open-source model means that µC/ software will be freely available to developers seeking a proven foundation for their embedded projects in the commercial domain. The licensing change also ensures that the µC/ components will remain viable across a wide range of market segments including the IoT where open-source software is particularly popular.”


For more information about open-source licensing of µC/ components, visit


About the Micrium µC RTOS Family

Founded in 1999 and acquired by Silicon Labs in 2016, Micrium has consistently held a leadership position in embedded software components. The company's flagship µC/ RTOS family is recognized for reliability, performance, dependability, impeccable source code and extensive documentation. Micrium’s widely deployed RTOS software has been ported to more than 50 MCU architectures and has a global footprint with more than 250,000 downloads across all embedded vertical markets, with solutions certified to meet safety-critical standards for medical electronics, avionics, communications, consumer electronics and industrial control.


Silicon Labs

Silicon Labs (NASDAQ: SLAB) is a leading provider of silicon, software and solutions for a smarter, more connected world. Our award-winning technologies are shaping the future of the Internet of Things, Internet infrastructure, industrial automation, consumer and automotive markets. Our world-class engineering team creates products focused on performance, energy savings, connectivity and simplicity.


Connect with Silicon Labs

Silicon Labs PR Contact: Dale Weisman +1-512-532-5871,

Follow Silicon Labs at, at, on Twitter at, on LinkedIn at and on Facebook at


Cautionary Language

This press release may contain forward-looking statements based on Silicon Labs’ current expectations. These forward-looking statements involve risks and uncertainties. A number of important factors could cause actual results to differ materially from those in the forward-looking statements. For a discussion of factors that could impact Silicon Labs’ financial results and cause actual results to differ materially from those in the forward-looking statements, please refer to Silicon Labs’ filings with the SEC. Silicon Labs disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.


Note to editors: Silicon Labs, Silicon Laboratories, the “S” symbol, the Silicon Laboratories logo and the Silicon Labs logo are trademarks of Silicon Laboratories Inc. All other product names noted herein may be trademarks of their respective holders.