Micropac Industries, Inc. is a leading manufacturer of microelectronic circuits, optoelectronic components, and sensor products for high-reliability applications. Founded in 1963 and headquartered in Garland, Texas, the company specializes in custom hybrid microcircuits, solid-state relays, and radiation-hardened devices. Its core product lines include the Optically Isolated Solid State Relay (OISSR) series, Hall effect sensors, temperature sensors, and fiber optic transmitters and receivers. Micropac also offers custom multi-chip modules and high-voltage optocouplers designed for extreme environments. The company serves critical sectors such as defense, aerospace, space exploration, medical equipment, and industrial controls. Its components are used in missile systems, satellite communications, and down-hole drilling tools. Micropac holds MIL-PRF-38534 Class H and K certifications for hybrid microcircuits and is ISO 9001/AS9100 certified. With a strong focus on reliability, the company has supplied components for NASA’s space programs and major defense platforms. Although a niche player, Micropac is recognized for its engineering expertise and rapid prototyping capabilities in the high-reliability electronics market.