The Hirose LX40-12P is a 12-position plug from the LX series, built for discrete wire harnesses where a tight 0.020" (0.50 mm) pitch keeps the bundle narrow. The single-row layout with gold-plated male pins and solder termination suits low-profile in-line connections — think internal signal runs in compact consumer or industrial gear where every millimeter of wire space counts. Black housing, tray packaging, and ROHS3 compliance round out the baseline.
Gold contact finish on the male pins is the reliability anchor here. For a free-hanging plug that may be mated and unmated during assembly or field service, gold resists oxidation and maintains consistent contact resistance through more cycles than tin would.
Position Count vs the 20-Circuit Sibling
The LX40-20P shares the same 0.020" (0.50 mm) pitch, single-row layout, gold plating, and free-hanging solder termination — the only difference is 20 positions against the 12 of the LX40-12P. If the harness needs more circuits at the same pitch, the 20-position version is a direct drop-in for the same mating receptacle family.