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| PartNumber | 54121-109051500LF | 54121-109031550LF | 54121-109021500LF |
| Description | Board to Board & Mezzanine Connectors HDR DB DR 100 GDP | Board to Board & Mezzanine Connectors BERGSTIK STACKING HEADER | Headers & Wire Housings 578-5NPF-BERGSTIK STR |
| Manufacturer | FCI / Amphenol | FCI / Amphenol | Amphenol FCI |
| Product Category | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | Rectangular - Board to Board Connectors - Board Spacers, Stackers |
| RoHS | Y | - | - |
| Series | BergStik | BergStik | BERGSTIKR, MezzSelect, Basics+ |
| Brand | Amphenol FCI | Amphenol FCI | - |
| Product Type | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | - |
| Factory Pack Quantity | 200 | 200 | - |
| Subcategory | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | - |
| Tradename | BergStik | BergStik | - |
| Part # Aliases | 54121109051500LF | 54121109031550LF | - |
| Color | - | - | Black |
| Packaging | - | - | Bulk |
| Termination | - | - | Solder |
| Mounting Type | - | - | Through Hole |
| Number of Positions | - | - | 2 |
| Pitch | - | - | 0.100" (2.54mm) |
| Number of Rows | - | - | 1 |
| Row Spacing | - | - | - |
| Length Overall | - | - | 1.025" (26.03mm) |
| Length Post Mating | - | - | 0.315" (7.99mm) |
| Length Stack Height | - | - | 0.590" (15.00mm) |
| Length Tail | - | - | 0.120" (3.05mm) |
| Contact Finish Post Mating | - | - | Gold, GXT |
| Contact Finish Thickness Post Mating | - | - | 30μin (0.76μm) |