5120521-1 is a 1.0mm Free Height (FH) IEEE 1386 compliant SMT stacking receptacle connector designed for parallel board-to-board applications. This 64-position receptacle features 30µ" gold plating, locating posts for accurate hand placement, and a 5.37mm height dimension. The connector provides a current rating of 1.0 ampere per contact, contact resistance of 30 milliohms maximum (initial), and durability tested to 100 mating cycles minimum. Additional clearance during mating increases reliability by allowing registration misalignment and eliminating stresses on solder joints. This connector is ideal for high-density electronic assemblies requiring reliable parallel board-to-board interconnections.