Board-to-Board Mezzanine Connector for Tight Stack Heights
The Hirose BM10NB(0.8)-34DS-0.4V(51) is a 34-position receptacle from the BM10 series, designed for board-to-board mezzanine connections where the mated stack height is held to 0.80mm.
What the 0.40mm Pitch and 0.80mm Stack Height Mean for Your Layout
The 0.40mm pitch sets the trace routing density on the board — expect fine-line PCB capability to route between pads. The 0.80mm mated height is the defining mechanical constraint: the opposing board must sit exactly 0.80mm above the host board, with no room for taller components on the facing surfaces. Gold contact finish at 2.00µin thickness is a flash coating — adequate for the limited mating cycles typical of a mezzanine connector that is assembled once and rarely unmated. For applications requiring frequent reconnection, a thicker gold layer would be preferred, but for a fixed board stack this is sufficient.
No direct replacement or second-source is listed; the mating half is a Hirose BM10 series header with the same 0.40mm pitch and 0.80mm stack height.