NDK (Nihon Dempa Kogyo Co., Ltd.) has released a series of SAW duplexers that are key components in US-CDMA and UMTS phones. They are used to separate the data that are simultaneously sent and received by the phone into two frequencies. The WX807C is for US-CDMA applications with a nominal frequency of 881.5 MHz in the Rx band (receiving) and 836.5MHz in the Tx band (transmit). The WX910A is for UMTS applications with a nominal frequency of 2140 MHz in the Rx band and 1950 MHz in the Tx band.

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NDK's NRS division has developed this plastic package using the same material found in plastic packaged semiconductors. This new packaging technology offers many advantages over the conventional ceramic packages. These duplexers are 40~50% lighter than ceramic, are easier to handle and assemble, and the packaging material is less expensive. These duplexers deliver a low insertion loss of 2.0 dB maximum in the Tx band and 2.8 dB maximum in the Rx band. They also exhibit high attenuation of 43 dB maximum in the Tx band and 55 dB maximum in the Rx band.

These SMD devices are in a miniature 3.8 mm x 3.8 mm package and are 1.5 mm high. They operate in a temperature range of -25 to +85ºC, and their input/output impedance is nominally 50 Ohms. Both of these SAW duplexers are lead-free, RoHS-compliant, and designed to withstand the requirements of re-flow soldering using lead-free solder. NDK is also TSO 16949-certified.

Delivery for the WX807C (US-CDMA) and WX910A (UMTS) series are 12 weeks, and cost for 10,000 pieces packaged tape and reel are approximately $1.15 each for the WX807C (for CDMA) and $1.62 each for the WX910A (for UMTS).