12 Circuits at 0.250-Inch Pitch — Board Layout Fit
The 643428-3: This is a 12-position, 3-row header with 0.250" (6.35 mm) pitch between contacts and between rows.
Gold Mating Surface — 30 µinch for Field-Service Duty
Locking Ramp and Board Guide — Vibration-Resistant Mate
The locking ramp provides audible tactile feedback when the header fully seats into the matching receptacle — critical in a harness assembly where the operator confirms the mate by feel. The board guide aligns the header during insertion, preventing the contacts from stubbing against the housing wall.