2.50 mm pitch, 3-position shrouded header with locking ramp
The 1-1971921-3 is a vertical through-hole header from TE Connectivity, pitched at 0.098" (2.50 mm) with 3 positions — but only 2 are loaded with contacts, so the third position is a keying or polarization slot. The 4-wall shrouding and locking ramp mean this header is designed for a secure, vibration-resistant mate with a matching receptacle — the ramp locks the pair together without a separate latch.
Loaded positions and board guide detail
The 3-position housing carries only 2 tin-plated copper alloy contacts — the empty position acts as a mechanical key to prevent mis-mating with a 3-position receptacle that expects all cavities filled.
Supplied in tube packaging, RoHS3 compliant, and sourced to order against RFQ — confirm the mating receptacle and quantity at quote time.