| PartNumber | 66956-021 | 66956-020LF | 66956-020 |
| Description | Headers & Wire Housings VERT CARD CONN D/R | Headers & Wire Housings PCB CONNECTOR 40P | Headers & Wire Housings PCB CONNECTOR 40P |
| Manufacturer | FCI / Amphenol | FCI / Amphenol | FCI / Amphenol |
| Product Category | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| RoHS | N | Y | N |
| Series | Dubox | Dubox | Dubox |
| Tradename | DUBOX | DUBOX | DUBOX |
| Packaging | Tube | Tube | Tube |
| Brand | Amphenol FCI | Amphenol FCI | Amphenol FCI |
| Product Type | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Factory Pack Quantity | 250 | 10 | 10 |
| Subcategory | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Part # Aliases | 66956021 | 66956020LF | 66956020 |
| Product | - | Headers | Headers |
| Type | - | Socket Assembly | Socket Assembly |
| Number of Positions | - | 20 Position | 40 Position |
| Pitch | - | 2.54 mm | 2.54 mm |
| Number of Rows | - | 2 Row | 2 Row |
| Mounting Style | - | - | - |
| Termination Style | - | Through Hole | Through Hole |
| Mounting Angle | - | Vertical | Vertical |
| Contact Gender | - | Socket (Female) | Socket (Female) |
| Contact Plating | - | Gold | Gold |
| Housing Material | - | Thermoplastic | Thermoplastic |
| Contact Material | - | Phosphor Bronze | Phosphor Bronze |