Microsemi Corporation was a leading American semiconductor company specializing in high-reliability, radiation-hardened, and secure solutions for aerospace, defense, communications, and industrial markets. Headquartered in Aliso Viejo, California, Microsemi was known for its FPGAs, analog/mixed-signal ICs, timing solutions, and power management products before being acquired by Microchip Technology in 2018 for $10.3 billion. Microsemi’s technologies were critical for mission-critical applications, including satellites, military systems, and industrial automation.