2187605-1 is a STRADA Whisper PiR 85-Ohm daughtercard connector designed for high-speed differential signal routing. This connector features a 3.9mm pitch and supports 85-Ohm impedance matching for optimal signal integrity. The design allows for efficient layer count routing, with 8-pair configurations requiring 4 or fewer layers and 12-pair configurations requiring 6 or fewer layers. The connector supports Layer Specific Routing (LSR) to reduce far end crosstalk in the via field. Common applications include high-speed backplane and daughtercard interconnects where signal integrity is critical.