The Amphenol 87916-421HLF is a 21-position, single-row, unshrouded pin header from the BERGSTIK® II series. It uses the industry-standard 0.100" (2.54mm) pitch, making it a direct footprint match for standard 0.100" receptacles. The header is through-hole mounted for solder termination, with tin-plated phosphor bronze contacts rated at 5 A per circuit at 110 V. Typical use is as a board-to-board interconnect where a low-cost, unkeyed pin header is called for — common in internal power/signal distribution on PCBs, test fixtures, and general-purpose prototyping.
What the Ratings Mean for Fit
The 0.100" (2.54mm) pitch is the most common pin-header spacing in the industry — it matches the vast majority of standard IDC receptacles, crimp housings, and board-to-board sockets. The 21-position count is the exact circuit count a BOM line calls for; the header is fully loaded with all positions populated. The 5 A per-contact rating is typical for a tin-plated square pin of this size — adequate for signal and moderate power duty, but the tin finish limits mating cycle life compared to gold. The unshrouded design means there is no polarization key or latch: the mating receptacle must provide its own orientation features, and the connection relies on the friction of the pin-to-socket interface.
Sourcing and Lifecycle
The 87916-421HLF carries an Active lifecycle status from Amphenol — no end-of-life notice on record. No official direct replacement or cross-reference is listed, but the BERGSTIK® II series includes many position-count and plating variants at the same 0.100" pitch.