12-Position IDC DIP Header — Dual-Pitch Design for Ribbon Cable
The Molex 0905841312 is a 12-position, dual-row IDC DIP header from the Picoflex 90584 series, designed to terminate a 1.27 mm pitch ribbon cable onto a 2.54 mm pitch PCB grid. This dual-pitch arrangement — 0.050" (1.27 mm) on the cable side, 0.100" (2.54 mm) on the board side — is the defining feature: it adapts a standard narrow-pitch ribbon cable to a wider, more routable through-hole footprint. The header accepts 26-28 AWG stranded wire via insulation displacement (IDC), and the closed-end shroud prevents the ribbon from being pushed past the contact zone during assembly. Mounting is through-hole press-fit, meaning the header is pressed into plated holes without solder — a clean, rework-friendly attachment for the PCB side.
Board-Side Pitch: 2.54 mm — Standard 0.100" Grid
The cable-side pitch of 0.050" (1.27 mm) is the narrower dimension — the ribbon cable's conductors are half the board pitch, which is typical for IDC ribbon-to-DIP adapters.