Board-to-Board Header for Legacy Footprints
The Amphenol 93939-404HLF is a 4-position, dual-row BergStik® II unshrouded header on the standard 0.100" (2.54mm) pitch. It is a through-hole, right-angle male pin header with tin-plated phosphor bronze contacts, rated 5A per circuit at 110V. The unshrouded design and push-pull fastening make it a straightforward board-to-board interconnect for low-density signal or low-current power tap applications, commonly found in legacy industrial control, test equipment, and prototyping assemblies.
Key Specs That Drive Fit
The 0.100" (2.54mm) pitch is the de facto standard for breadboard-compatible layouts and legacy 0.1-inch grid PCBs — the footprint matches decades of existing designs. The 4 positions (all loaded) mean this header serves a 4-circuit BOM line exactly; no spare pins to route. The right-angle orientation places the pins parallel to the board, which suits edge-mounting or tight enclosures where vertical headers won't fit. Tin-on-tin contacts (100.0µin / 2.54µm on the mating side) are cost-effective for low-cycle applications — expect a few hundred mates before fretting becomes a concern. The UL94 V-0 black housing is standard for equipment inside an enclosure requiring flame rating.
Lifecycle and Sourcing
The 93939-404HLF carries an Active lifecycle status per Amphenol — full production, no end-of-life notice.