The HMC129LC4 from Analog Devices is a RF Mixer with RF Frequency 4to8 GHz, LO Frequency 4.0 to 8.0 GHz, IF Frequency DC to 3 GHz, Conversion Loss 7 dB, LO Drive - Power 15 dBm. Tags: Surface Mount, Double Balanced Mixer. More details for HMC129LC4 can be seen below.