0.40 mm Pitch Header for Tight Board Stacks
The Hirose BM20B(0.8)-10DP-0.4V(53) is a 10-position header from the BM20 series, built for dense board-to-board interconnects where vertical space is at a premium. The mated stack height lands at 0.8mm — tight enough for handheld devices and multi-board modules where every tenth of a millimetre counts. Gold plating on the contact finish keeps the signal path clean across repeated mating cycles, which matters when the connector lives inside a device that gets serviced or reworked. The header sits 0.026" (0.65mm) above the board surface, and the solder retention feature holds it in place during reflow — no secondary hand-soldering needed to keep the part from walking off its pads.
Mating Half and Position Variants
This header mates with the BM20B(0.8)-10DS-0.4V(53) receptacle, which uses center strip contacts instead of outer shroud contacts — a straight mechanical match at the same 0.40mm pitch and 0.8mm stack height. If the BOM calls for more circuits, the BM20 series offers 16- and 20-position headers (BM20B(0.8)-16DP-0.4V(51) and BM20B(0.8)-20DP-0.4V(53)) at the same 0.65mm board height, so the footprint scales without changing the z-axis clearance.