DF40HC(3.0)-100DS-0.4V(51)

DF40HC(3.0)-100DS-0.4V(51) is a 100-position board-to-board receptacle from Hirose's DF40 series — 0.4 mm contact pitch, 3.0 mm stacking height (the (3.0) in the code), vertical SMT mounting. Hirose's specifications: rated current 0.3 A, rated voltage 50 V AC/DC, operating range −55 °C to +85 °C, 30 mating cycles, gold-plated contacts (0.05 µm minimum over 1 µm nickel underplate, per Hirose's drawing notes), LCP housing to UL 94 V-0, body 22.6 x 3.38 x 2.9 mm, supplied on tape and reel at 3,000 pieces. Hirose's product record flags this part as neither NRND nor discontinued. One naming note that matters for ordering: the full string ends with a closing bracket — Hirose's official 2D drawing (EDC3-315881-01) prints the part number 'DF40HC(3.0)-100DS-0.4V(51)' in its table and ties it to Hirose code CL0684-4151-0-51, whatever truncated form a web listing may show. The selection point is a hundred signal lines across a 3.0 mm stack in handheld and module designs. Selection advice: quote the code with the closing bracket and the CL number together; both are on the drawing, and either one alone invites a near-miss.