The CPC7581 is a monolithic solid state switch in a 16 pin surface mount SOIC package. It provides the necessary functions to replace a 2-Form-C electromechanical relay on analog line cards found in Central Office, Access and PBX equipment. The device contains solid state switches for tip and ring line break and ring injection/ring return. The CPC7581 requires only a +5V supply and offers "break-before-make" or "make-before-break" switch operation using simple logic level input control. There are two versions of the CPC7581, the CPC7581BA and the CPC7581BB. The "BA" version has a protection SCR which provides protection to the SLIC device and subsequent circuitry during fault conditions.