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| PartNumber | 71991-409NLF | 71991-409LF | 71991-409 |
| Description | Board to Board & Mezzanine Connectors DUBOX | Board to Board & Mezzanine Connectors 18P BtB RECPT DR TMT TIN/NI VERTICAL | |
| Manufacturer | Amphenol FCI | Amphenol FCI | Amphenol FCI |
| Product Category | Rectangular - Board to Board Connectors - Headers, Receptacles, Female Sockets | Rectangular - Board to Board Connectors - Headers, Receptacles, Female Sockets | Rectangular - Board to Board Connectors - Headers, Receptacles, Female Sockets |
| Color | Blue | Blue | Blue |
| Series | DUBOX, MezzSelect, Basics+ | DUBOX, MezzSelect, Basics+ | DUBOX, MezzSelect, Basics+ |
| Packaging | Tube | Tube | Tube |
| Termination | Solder | Solder | Solder |
| Mounting Type | Through Hole | Through Hole | Through Hole |
| Features | - | - | - |
| Height Above Board | 0.275" (6.99mm) | 0.275" (6.99mm) | 0.275" (6.99mm) |
| Connector Type | Receptacle, Bottom or Top Entry | Receptacle, Bottom or Top Entry | Receptacle, Bottom or Top Entry |
| Contact Finish | Tin | Tin | Tin |
| Contact Finish Thickness | 78.7μin (2.00μm) | 78.7μin (2.00μm) | 78.7μin (2.00μm) |
| Number of Positions | 18 | 18 | 18 |
| Number of Positions Loaded | All | All | All |
| Pitch | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) |
| Number of Rows | 2 | 2 | 2 |
| Row Spacing | 0.100" (2.54mm) | 0.100" (2.54mm) | 0.100" (2.54mm) |
| Height Stacking Mating | - | - | - |