Development and On-Orbit Operation of a Reliable CubeSat Platform for Testing Korean-Manufactured EEE Parts: EEETester

The Republic of Korea has been actively promoting the development of domestically manufactured electronic components, including semiconductor memory devices as well as active and passive components, through sustained national R&D initiatives. Despite this progress, the adoption of these components in space missions has been limited due to insufficient space heritage. In contrast, spacecraft subsystems utilizing Commercial Off-The-Shelf (COTS) components have recently demonstrated reliable performance through accumulated flight experience. To bridge this gap and accelerate the qualification of Korean-made Electrical, Electronics, and Electromechanical (EEE) parts, the Korea Aerospace Research Institute (KARI) developed the Electrical, Electronics, and Electromechanical Tester (E3Tester), a 12U CubeSat dedicated to in-orbit validation. The first E3Tester mission has successfully demonstrated stable on-orbit operation, validating the performance of multiple domestic EEE components in the Low Earth Orbit environment. Building on this success, two additional E3Tester missions are going to the launch aboard the Korea Space Launch Vehicle (KSLV) in 2026 and 2027, enabling continued accumulation of space heritage. The platform features a modular 4U bus supporting up to 8U of payloads, flexible power and data interfaces, precise attitude control, and high-rate X-band communications. These missions are expected to significantly enhance the competitiveness of Korea’s space electronics industry and support the sustainable growth of the national space ecosystem.