What this header is
The Amphenol 79425-104HLF is the 4-position dual-row member of the BERGSTIK II unshrouded male pin header series, configured for board-to-board stacking at 0.100 inch (2.54 mm) pitch across two rows. Phosphor bronze square pins are gold-flash finished to 30.0 µin (0.76 µm) thickness on the mating face, carrying a 5 A per-contact rating at the 110 V headline voltage. The push-pull push-pull fastening type and 0.190 inch (4.83 mm) contact engagement length keep the mating pair seated under vibration without a locking latch — the retention is governed by the interference fit of the pin in the receptacle contact, not a positive lock feature. The housing is rated UL94 V-0, with 0.100 inch (2.54 mm) insulation height above the board plane and 0.120 inch (3.05 mm) of post extending below the board surface — the post length determines the fillet formation zone for a reliable solder joint in through-hole assembly. All 4 positions are populated.
Mating half and termination
Termination is through-hole solder, so the footprint is a standard dual-row 0.100 inch grid. The header mates with any 4-position 2-row BERGSTIK II IDC receptacle or female header on the same 0.100 inch row spacing — the row spacing matches the pitch at 0.100 inch (2.54 mm), so board-to-board stack height is set by the mating half's insulation height and the board thickness in between.