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| PartNumber | HDWM-21-55-S-D-355-SM-A-P | HDWM-21-55-S-D-355-SM | HDWM-21-55-S-S-490-SM |
| Description | Board to Board & Mezzanine Connectors .050" X .100" Flex Stack, High-Temp Micro Board Stacker | Board to Board & Mezzanine Connectors .050" X .100" Flex Stack, High-Temp Micro Board Stacker | Conn Board Stacker HDR 21 POS 1.27mm Solder ST SMD - Bulk (Alt: HDWM-21-55-S-S-490-SM) |
| Manufacturer | Samtec | Samtec | - |
| Product Category | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | - |
| RoHS | Y | Y | - |
| Product | Headers | Headers | - |
| Number of Positions | 42 Position | 42 Position | - |
| Pitch | 1.27 mm | 1.27 mm | - |
| Number of Rows | 2 Row | 2 Row | - |
| Termination Style | SMD/SMT | SMD/SMT | - |
| Mounting Angle | Straight | Straight | - |
| Series | HDWM | HDWM | - |
| Packaging | Tube | Tube | - |
| Application | Optional polarization | Optical Polarization | - |
| Contact Plating | Gold | Gold | - |
| Housing Material | Liquid Crystal Polymer (LCP) | Liquid Crystal Polymer (LCP) | - |
| Brand | Samtec | Samtec | - |
| Contact Material | Phosphor Bronze | Phosphor Bronze | - |
| Flammability Rating | UL 94 V-0 | - | - |
| Mounting Style | SMD | SMD | - |
| Maximum Operating Temperature | + 125 C | + 125 C | - |
| Minimum Operating Temperature | - 55 C | - 55 C | - |
| Product Type | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | - |
| Stack Height | 9.017 mm | 9.017 mm | - |
| Factory Pack Quantity | 21 | 21 | - |
| Subcategory | Board to Board & Mezzanine Connectors | Board to Board & Mezzanine Connectors | - |
| Tradename | Flex Stack | Flex Stack | - |