The 3-641213-3: This is a TE Connectivity MTA-100 single-row header, 3 positions, 0.100" (2.54mm) pitch — the standard spacing for the MTA-100 wire-to-board system. Rated 250VAC, with current depending on the wire gauge you crimp into the mating receptacle.
RoHS compliant per the listing. No known cross-reference or direct replacement from TE — stick with the MTA-100 mating half (receptacle housing and crimp terminals) for a guaranteed fit.
Single-Wall Shroud: What It Means for Assembly
The shroud covers only one side of the header — the other three sides are open. This saves board space and cost compared to a fully shrouded header, but the mating receptacle needs to be aligned manually rather than self-centering. Fine for low-volume or jigged assembly; less forgiving on a high-speed pick-and-place line without vision guidance. The overall contact length is 0.535" (13.59mm) with a mating length of 0.295" (7.49mm) and a post length of 0.140" (3.56mm) — standard for a 1.6mm PCB thickness.