The SAC3508Q4 from SuperApex Corporation is a RF Mixer with LO Frequency 2 to 6 GHz, IF Frequency DC to 2 GHz, Conversion Loss 8 to 8.5 dB, LO/RF Isolation 24 dB, LO/IF Isolation 20 to 24 dB. Tags: Surface Mount, Double Balanced Mixer. More details for SAC3508Q4 can be seen below.