Receptacles feature minimal insertion length contact down to 1.02mm

September 18, 2019 //By Julien Happich
Mill-Max Manufacturing has developped new receptacles with minimal insertion length contact designed to work with shorter mating leads. The receptacles are fitted with a new, beryllium copper contact clip which is characterized by an early engagement contact point, dual entry capability, low contact resistance and high current carrying capacity.

The 0448-0-15-15-48-27-10-0 and 0640-0-15-15-48-27-10-0 receptacles accept lead diameters from 0.94 to 1.09mm with a minimum mating lead length of 1.47mm for top entry insertion. This is a 30% reduction in required lead length from the company’s former receptacle offerings. The reduction is due to the hourglass design and extended contact surface area, eliminating the need for excess protrusion through its fingers for reliable electrical contact. The ability to use shorter mating pins provides several advantages such as compressed packaging, shorter electrical signal paths and lower potential RF signal interference.

The 0448 is a closed bottom, solder mount receptacle with a 0.635mm low profile height above the board. It is designed to be soldered in a 1.8mm minimum mounting hole. The 0640 is a zero profile, solderless press-fit receptacle with an overall length of 2.67mm. This part features a hexagon shaped head designed to be press-fit into a 2.16mm diameter plated through hole. When pressed in, the 0640 sits flush with the P.C.B. surface. The 0640 is also open bottom allowing for mating pin entry from either end. The minimum mating pin length for bottom entry is 1.52mm from the bottom of the receptacle. This dual entry feature allows for flexibility in component placement and assembly of boards and modules. The contact clip is press-fit into each receptacle shell forming a gas-tight connection. It is a four-finger contact, precision stamped from Beryllium Copper strip and heat treated to provide excellent spring and electrical properties. Both receptacles have a current rating of 20A at a 10˚C temperature rise above ambient, in free air, and less than 20 milli-ohms contact resistance. The standard plating for these receptacles is 10 u” gold on the shell and 30 u” gold on the contact to ensure the highest conductivity, corrosion resistance and durability. Tin and tin/lead plating options are also available upon request for the 0448.

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