The Fine Stack (FS) series of rectangular connectors is designed for mezzanine (board-to-board) applications. This particular connector, with a part number of 856093-4-5353512-0, is a receptacle with center strip contacts.

• Series: Fine Stack (FS)
• Mounting Type: Mezzanine (Board-to-Board)
• Connector Type: Receptacle
• Contact Type: Center Strip
• Number of Positions: 40
• Pitch: 0.020" (0.50mm)
• Solder Retention: Yes
• Contact Finish: Gold
• Contact Finish Thickness: 8.00µin (0.203µm)
• Mounting Style: Surface Mount
• Height Above Board: 0.047" (1.20mm)
• Packaging: Tape & Reel (TR) or Cut Tape (CT)
• Standard Package Quantity: 6,000 pcs
• Mated Stacking Height: 1.5mm

This connector is part of the active product lineup from TE Connectivity, a trusted manufacturer in the industry.