The SAC3503 from SuperApex Corporation is a RF Mixer with LO Frequency 2 to 3.5 GHz, IF Frequency 10 to 600 MHz, Conversion Gain 13 dB, Noise Figure 5.5 dB, LO/RF Isolation 45 dB. Tags: Die, Down-Conversion Mixer. More details for SAC3503 can be seen below.