SeongJi Industrial Co., Ltd. (also known as SJI or SJIT) was founded in 1985 and is headquartered in Hwaseong-si, Gyeonggi-do, South Korea. The company originally developed and manufactured wired electronic interfaces such as harnesses and PCB assemblies before expanding significantly into wireless communication and IoT modules, notably acquiring Wisol’s LPWAN IoT business division in 2019.
SJI operates global production facilities and international offices in Vietnam, Egypt, and Russia, having earned the $100 Million Export Tower from the Korean government and the National Productivity Award. The company collaborates closely with semiconductor leaders like STMicroelectronics to develop sub-GHz LPWAN RF modules for international IoT deployment.