What this 20-position unshrouded header mates with
The 2-640452-0: Unshrouded design means the receptacle housing provides the alignment – no shroud on the header to guide the mate.
Board fit and footprint details
Overall contact length is 0.535" (13.59 mm), and the mating pin length is 0.295" (7.49 mm) – enough to engage the receptacle's contact beam fully. The natural (uncolored) thermoplastic housing is rated UL94 V-0.
