0.35mm Pitch Mezzanine Header, 64 Positions, 0.8mm Stack
The Hirose BM23PF0.8-64DP-0.35V(51) is a 64-position header from the BM23PF series, designed for board-to-board mezzanine stacking. It uses a 0.014" (0.35mm) pitch in a dual-row arrangement with outer shroud contacts, and mates to a 0.8mm stack height — the tight pitch and low profile suit it for compact portable electronics where PCB real estate is at a premium.
This header mates with the BM23PF0.8-64DS-0.35V(51) receptacle, which has center strip contacts at the same 0.014" (0.35mm) pitch and a 0.031" (0.80mm) height above board. The mated pair gives a 0.8mm stack height — that's the z-height budget you need for the board-to-board gap. The 0.025" (0.63mm) height of this header means the receptacle sits slightly taller in the stack. For a lower position count, the BM23PF0.8-54DP-0.35V(51) offers 54 positions at the same 0.014" (0.35mm) pitch and 0.025" (0.63mm) height, if the BOM calls for fewer circuits.