The difference is plating on the contact area.
PCN13-50S-2.54DS(71) : 2μm tin copper over 1μm nickel
PCN13-50S-2.54DS(81) : 2μm tin over 1μm nickel
PCN13-50S-2.54DS(71) is...
The difference is the gold plating thickness at the contact area.
PCN10-96P-2.54DS(71) : 0.1μm
PCN10-96P-2.54DS(72) : 0.2μm
PCN10-96P-2.54DS(77) : 0.76μm
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