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| PartNumber | QMS-078-01-L-D-RA-MG-K | QMS-078-01-L-D-EM2 | QMS-078-01-L-D-EM2-PC8 |
| Description | Board to Board & Mezzanine Connectors 0.635 mm Q2 High-Speed Rugged Ground Plane Terminal Strip | Board to Board & Mezzanine Connectors 0.635 mm Q2 High-Speed Rugged Ground Plane Terminal Strip | Board to Board & Mezzanine Connectors 0.635 mm Q2 High-Speed Rugged Ground Plane Terminal Strip |
| Manufacturer | Samtec | Samtec | Samtec |
| Product Category | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors |
| RoHS | Y | Y | Y |
| Product | Headers | Headers | Headers |
| Number of Positions | 156 Position | 156 Position | 172 Position |
| Pitch | 0.635 mm | 0.635 mm | 0.635 mm |
| Number of Rows | 2 Row | 2 Row | 2 Row |
| Termination Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Mounting Angle | Straight | Straight | Straight |
| Current Rating | 2.6 A | 2.6 A | 2.6 A |
| Voltage Rating | 300 VAC | 300 VAC | 300 VAC |
| Series | QMS | QMS | QMS |
| Packaging | Bulk | Tray | Tray |
| Application | Power, Signal | Power, Signal | Power, Signal |
| Contact Plating | Gold | Gold | Gold |
| Housing Material | Liquid Crystal Polymer (LCP) | Liquid Crystal Polymer (LCP) | Liquid Crystal Polymer (LCP) |
| Brand | Samtec | Samtec | Samtec |
| Contact Material | Phosphor Bronze | Phosphor Bronze | Phosphor Bronze |
| Mounting Style | SMD | SMD | SMD |
| Maximum Operating Temperature | + 125 C | + 125 C | + 125 C |
| Minimum Operating Temperature | - 55 C | - 55 C | - 55 C |
| Product Type | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors |
| Stack Height | 10 mm | 10 mm | 10 mm |
| Factory Pack Quantity | 16 | 9 | 26 |
| Subcategory | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors |
| Tradename | Q2 | Q2 | Q2 |