Support is limited to customers who have already adopted these products. The Intersil HCS27MS is a Radiation Hardened Triple 3-Input NOR Gate. A Low on all inputs forces the output to a High state. The HCS27MS utilizes advanced CMOS/SOS technology to achieve high-speed operation. This device is a member of radiation hardened, high-speed, CMOS/SOS Logic Family. The HCS27MS is supplied in a 14 lead Ceramic flatpack (K suffix) or a SBDIP Package (D suffix).