A 40-Position Micro-Coaxial Plug for Ultra-Fine Ribbon Cable
The Hirose DF56-40P-0.3SD(51) is a 40-position plug from the DF56 series, a connector family built for micro-coaxial and ultra-fine ribbon cable assemblies where board real estate is at a premium. The housing is black, uses a detent lock for positive retention in free-hanging applications, and terminates via solder — not crimp — so the cable assembly process is reflow or hand-solder at the cable end.
Wire Gauge and Termination Reality
The 42-46 AWG wire gauge range tells you this is not a general-purpose interconnect. At 46 AWG the conductor diameter is about 0.0016 inches — you need a controlled-environment assembly station with proper micro-soldering tips and magnification. The solder termination means the ribbon cable or micro-coax ends are tinned and soldered directly into the plug body; there is no separate crimp terminal to source.