The Hirose BM10NB(0.8)-20DS-0.4V(51) is a 20-position receptacle with center strip contacts from the BM10 series, designed for board-to-board mezzanine stacking. The 0.016" (0.40mm) pitch and 0.8mm mated stacking height target tight z-height budgets in portable electronics — think smartphone mainboards to display flexes, or compact camera modules. Gold contacts with 2.00µin (0.051µm) plating handle the signal duty in these dense layouts, and the solder retention feature keeps the part anchored during reflow and under vibration.
Position Count and Series Fit
This 20-position sits in the BM10 family alongside 16-, 24-, and 30-position variants at the same 0.016" (0.40mm) pitch and 0.8mm stack height. The choice comes down to your I/O count — match the position number to your signal lines.