Found 6 alternatives for SIM-153+ by Mini-Circuits. Rf Mixers — 8-SMD, No Lead.
IC MIX 2.3GHZ-8GHZ UP/DOWN 6SMD
IC MIX 3.7GHZ-10GHZ UP/DOWN 8SMD
IC MIX 2.3GHZ-7.2GHZ UP/DWN 8SMD
IC MIXER 1GHZ-4GHZ 8SMD
IC MIX 3.2GHZ-15GHZ UP/DOWN 8SMD
IC MIX 750MHZ-4.2GHZ UP/DWN 8SMD