High-density and high-pin count flexible SMD connector for high-speed data bus

Abstract

A high-density high-pin-count flexible surface mount device (SMD) connector used for high-speed data buses between multichip modules (MCMs) or daughter boards is described. This connector consists of flexible film cable interconnection that has accurately controlled characteristic impedance and contact housing composed of double-line contacts and SMT type leads. It has 98 contacts each with a pitch of 0.4 mm. This connector mounting area is 6-mm wide and 23-mm long. The flexible cable has a double-sided tri-plate micro strip-line structure with insertion force of less than 3.9 kg and characteristic impedance of 48 to 50 /spl Omega/. Insertion loss is -0.5 dB at 600 MHz and crosstalk noise is less than 110 mV at 250 ps rising time. This connector can be applied for high-speed data transmission of up to 300 ps rising time.<>