The EFA240D is an electronic component manufactured by Excelics Semiconductor, Inc. It is a limited supply product with medium popularity in the market. The product can be used in various electronic devices such as amplifiers, oscillators, and mixers. The EFA240D can operate at a frequency range of 2 GHz to 40 GHz. It is a high-performance device that can be used in various applications that require high-frequency performance.