The Amphenol FCI 93939-420HLF is a 20-position dual-row board-to-board header in the BERGSTIK II series — 0.100 inch (2.54 mm) pitch throughout, right-angle through-hole mount, push-pull fastening, unshrouded pin geometry. Tin-plated phosphor bronze contacts carry 5 A per circuit at up to 110 V, with a mating-side finish of 100.0 µinch (2.54 µm) thick tin. The housing sits 0.190 inch (4.83 mm) above the board surface when mounted and is rated UL94 V-0.
What the ratings mean for fit
The 0.100 inch (2.54 mm) pitch is the standard grid — it mates with any matching 2.54 mm pitch IDC or ribbon cable receptacle in the BERGSTIK II family or equivalent. All 20 positions are loaded, so there are no open slots in the footprint. The 0.190 inch (4.83 mm) insulation height sets the board standoff; verify the mated pair's housing depth against that figure. 5 A per contact is the real usable current for power bypass or low-level signal — the tin plating is not the limiting factor here; what governs is the circuit count and ambient temperature at the board level, so derate per your thermal layout if multiple circuits carry full load simultaneously.
Where it is used
BERGSTIK II headers are a go-to for board-to-board stacking and internal signal routing in industrial control, instrumentation, and legacy digital interconnects. The right-angle orientation suits perpendicular board-on-backplane routing; the unshrouded pin lets you route traces under the connector body on the destination board, which matters when board real estate is tight. The UL94 V-0 housing makes it suitable for enclosed equipment that must meet flammability standards.
Lifecycle and sourcing
The 93939-420HLF is listed Active — quoted to order against BOM quantity. No official successor order code is on record; the 20-position count is a standard member of the BERGSTIK II series, so a parametric search within that series will surface same-pitch alternatives if you need a sourcing fallback.