It's a 50 Ohm, single-port, snap-on connector rated to 40 GHz — squarely in the millimeter-wave band where board-to-board and module-to-module interconnects need a smaller footprint than standard SMP. The gold-plated beryllium copper body and PTFE dielectric keep the signal clean through the launch. This is the plug half; it mates with any SMPM jack that uses the standard snap-on interface.
What the 40 GHz Rating Means for the Signal Path
40 GHz is the upper end of the SMPM frequency range — this connector is built for mmWave applications like 5G backhaul, radar modules, and high-speed test heads.
Cable and Termination Details
This plug is built for RG-405 semi-rigid cable — the.085" or.086" diameter stuff that holds its shape once bent. Both the shield and the center contact are solder-terminated, so you need a controlled-temp iron and a steady hand; no crimp tool here. That means assembly steps matter: the insulator slides over the center conductor first, then the contact solders to the center pin, and the body solders to the cable braid.
Rated for 100 mating cycles — that's typical for a snap-on SMPM connector. The snap-on retention is quick to engage and release, but the beryllium copper fingers in the jack will eventually lose their grip after repeated matings. For a test-fixture or a module that gets swapped quarterly, 100 cycles is plenty. For a permanent install that's mated once and left, it's irrelevant.
The 925-138J-51P is the jack (male pin) counterpart to this plug — same SMPM snap-on interface, same 50 Ohm / 40 GHz rating, same beryllium copper construction. The key difference is mating cycles: the 925-138J-51P is rated for 500 cycles versus this plug's 100 cycles. That's because the 925-138J-51P uses a full detent retention feature, which spreads the wear across a larger engagement surface. If your application calls for frequent connect-disconnect — think a production test port or a module that gets swapped weekly — the 925-138J-51P is the better bet. For a one-time cable assembly that stays mated, the 925-118C-51S does the job at a lower cycle count.