The difference is key of insulator.
HIF3FCA-50PA-2.54DS(71) can mate with both HIF3BB-50D-2.54R(63) (one central convex key) and HIF3BA-50D-2.54R(63) (two convex keys).
HIF3...
The difference is RoHS and insulation material manufacturer.
HIF3BA-**PA-2.54DSA(00) : Not comply with RoHS(discontinued)
HIF3BA-**PA-2.54DSA(71) : Complies with RoHS, Sabic(d...
The difference is sealing resin.
HIF3CA-"xx"PA-2.54DSA(63) : Without sealing resin, our standard product
HIF3CA-"xx"PA-2.54DSA(91) : Sealing resin is applied between insulator...
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