The F5CM series of SAW filters have balanced in/unbalanced out or unbalanced in/balanced out of I/O ports. Therefore these filters are suitable for the design using balanced type of IC. By using these filters, any transforming devises, such as balun is not required. The F5CM series filters apply to the frequency range 700 to 1000MHz. High performance has been realized with high reliability and small size by using original materials and original design. The F5CM series filters are suitable for RF interstage filter in mobile communication systems and standard parts are available for GSM and AMPS/TDMA/CDMA standards.