The Hirose DF12B(5.0)-50DP-0.5V(86) is a 50-position, dual-row board-to-board header from the DF12 series, with a 0.020" (0.50 mm) pitch that packs 50 circuits into a compact footprint.
At 0.50 mm pitch, this header demands a PCB with fine-line trace-and-space capability — standard 0.062" FR4 with 1 oz copper will route it, but the breakout between pads is tight. The 50 positions in two rows give a 25-per-row layout; the outer shroud adds roughly 0.5 mm to the board footprint beyond the outermost contacts. Compare this to the 40-position DF12B(5.0)-40DP-0.5V(86) at the same pitch and stack height: the choice is purely position count matching your circuit count. The 5 mm stack height is the only height option in this (5.0) variant — if your board spacing is tighter or looser, you need a different DF12 stack height code.
Obsolete Status — Sourcing Reality for This Header
The DF12B(5.0)-50DP-0.5V(86) is marked obsolete. Hirose has moved on to newer DF12 variants, and this exact order code is no longer in factory production. If your design can tolerate a different stack height or position count, a current-production DF12 variant may fit, but that requires a board layout review.
Mating and Termination — What Connects Here
Termination on this header side is surface-mount only; the tails are gull-wing style for reflow soldering.