The Molex 0734066416 is a straight SMP jack-to-jack adapter from the 73406 series — a female-to-female barrel that joins two male SMP plugs in a single in-line path. The body and center contacts are machined from beryllium copper with gold plating on the signal path, giving the snap-on retention its repeatable cycle life and keeping passive intermodulation low across the band.
What the 40 GHz rating means for the signal path
40 GHz is the top end of the SMP interface — this adapter doesn't roll off early. The straight body keeps the signal path clean with no right-angle bend to add a mode conversion or a standing-wave bump. In a test setup or a system interconnect running K-band or millimeter-wave, this barrel passes through the full band without introducing a VSWR discontinuity that would show up on a network analyzer sweep. The PTFE dielectric holds the impedance stable from DC through 40 GHz, which is the same dielectric used in high-performance semi-rigid cable assemblies.
SMP-to-SMP gender changer — same-series, no interface mismatch
This adapter converts SMP male to SMP male by providing two female SMP jacks back-to-back. Both ends are SMP, same series, so there is no interface transition — no SMP-to-SMA or SMP-to-2.92 mm step that would add a loss bump. The snap-on fastening on both ends locks the plug into the adapter with a positive detent; no coupling nut to torque, just push until it clicks. The free-hanging in-line body sits in the cable path without a panel flange or a bulkhead mount, so it works as a bullet between two cable-mounted plugs or between a cable plug and a board-mount jack.
Materials and build — beryllium copper and gold across the RF path
The body and the center contacts are both beryllium copper, a spring alloy that holds its shape through repeated snap-on engagements. Gold plating on the center contact and on the body finish keeps the mating surfaces corrosion-free and maintains a stable contact resistance over the life of the interconnect. The BeCu spring fingers in the female jack are what give the SMP interface its rated mating cycle count — the material doesn't take a set after the first few mates.