Position count and footprint
The 77311-422-31LF: The 31 positions and single-row layout match a 31-pin footprint on 2.54 mm pitch; the unshrouded push-pull fastening suits board-edge or inline mating where shrouding is not required.

Amphenol BERGSTIK header, order code 77311-422-31LF, 31 positions, single row, 0.100" (2.54mm) pitch, 3 A per contact, unshrouded, through-hole, solder termination.
| Parameter | Value |
|---|---|
| Series | BERGSTIK® |
| Type | Male Pin |
| Mounting | Through Hole |
| Connector type | Header |
| Fastening type | Push-Pull |
| Current rating | 3A per Contact |
| Operating temperature | -65°C~125°C |
| Contact material | Phosphor Bronze |
| Insulation color | Black |
| Insulation height | 0.100\" (2.54mm) |
| Insulation material | Thermoplastic |
| Material flammability rating | UL94 V-0 |
| Style | Board to Board |
| Package | Bag |
| Shrouding | Unshrouded |
| Termination | Solder |
| Contact shape | Square |
| Rows | 1 |
| Pitch | 0.100\" (2.54mm) |
| Positions | 31 |
| Contact finish - post | Tin |
| Contact length - post | 0.120\" (3.05mm) |
| Overall contact length | 0.525\" (13.34mm) |
| Contact finish - mating | Tin |
| Contact length - mating | 0.305\" (7.75mm) |
| Contact finish thickness - post | 78.7µin (2.00µm) |
| Contact finish thickness - mating | 78.7µin (2.00µm) |
The 77311-422-31LF: The 31 positions and single-row layout match a 31-pin footprint on 2.54 mm pitch; the unshrouded push-pull fastening suits board-edge or inline mating where shrouding is not required.