The HMC218MS8 is an ultra miniature doublebalanced mixer in an 8 lead plastic surface mount package (MSOP). This passive MMIC mixer is constructed of GaAs Schottky diodes and novel planar transformer baluns on the chip. The device can be used as an up, or downconverter, bi-phase (de)modulator or phase comparator for UNII & HIPERLAN 5.2 & 5.8 GHz applications. It is especially suited for PCMCIA transceivers and portable wireless applications because of its high dynamic input signal range, small size, and low cost. The consistent MMIC performance will improve system operation and assure regulatory compliance. The MSOP8 package is the smallest footprint available for a complete double-balanced mixer, 0.118" x 0.190" (3.0mm x 4.9mm). At a height of 0.040" (1.0mm) this is the thinnest mixer package available today.