The HMC554LC3B is a general purpose double balanced mixer in a leadless RoHS compliant SMT package that can be used as an upconverter or downconverter between 11 and 20 GHz. This mixer is fabricated in a GaAs MESFET process, and requires no external components or matching circuitry. The HMC554LC3B provides excellent LO to RF and LO to IF isolation due to optimized balun structures. The RoHS compliant HMC554LC3B eliminates the need for wire bonding, and is compatible with high volume surface mount manufacturing techniques.