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| PartNumber | HW-21-12-SM-D-787-SM-A | HW-21-12-G-S-575-SM | HW-21-12-FM-S-325-SM |
| Description | Board to Board & Mezzanine Connectors .100" Flex Stack, High-Temp Flexible Board Stacker, Surface Mount | .025 BOARD SPACERS | .025 BOARD SPACERS |
| Manufacturer | Samtec | - | - |
| Product Category | Board to Board & Mezzanine Connectors | - | - |
| RoHS | Y | - | - |
| Product | Headers | - | - |
| Number of Positions | 42 Position | - | - |
| Pitch | 2.54 mm | - | - |
| Number of Rows | 2 Row | - | - |
| Termination Style | SMD/SMT | - | - |
| Mounting Angle | Straight | - | - |
| Series | HW | - | - |
| Packaging | Bulk | - | - |
| Application | Elevated Board Stacking | - | - |
| Contact Plating | Gold | - | - |
| Housing Material | Liquid Crystal Polymer (LCP) | - | - |
| Brand | Samtec | - | - |
| Contact Material | Phosphor Bronze | - | - |
| Flammability Rating | UL 94 V-0 | - | - |
| Mounting Style | Mounting Peg | - | - |
| Maximum Operating Temperature | + 125 C | - | - |
| Minimum Operating Temperature | - 55 C | - | - |
| Product Type | Board to Board & Mezzanine Connectors | - | - |
| Stack Height | 19.9898 mm | - | - |
| Factory Pack Quantity | 1 | - | - |
| Subcategory | Board to Board & Mezzanine Connectors | - | - |
| Tradename | Flex Stack | - | - |