Leadless Chip Carrier. A chip package whose input and output pads sit right on the perimeter of the package. Leadless chip carriers come in several types. Types A through D are typically ceramic, with hermetically sealed metal or ceramic lids. Among these types, the designer can choose from a cavity-up or cavity-down thermal orientation. A leadless type E, which is rectangular, has also been developed for memory applications (ROMs, PROMs, EPROMs, DRAMs, and static RAMs). There is also a leadless type F for memory chips, which can be mounted directly onto a ceramic DIP carrier.