Littelfuse acquired IXYS Corporation in January 2018. All power semiconductor products now belong to the IXYS: A Littelfuse Technology brand.

IXYS: A Littelfuse Technology solutions include highvoltage integrated circuits (ICs) and optically isolated solid state relays (OptoMOS®) for the communication, industrial, power, and consumer markets, plus solid state relays (SSRs) for the telecommunications, security, utility metering, and industrial control industries.

http://www.ixys.com