Mill-Max offers miniature receptacles for diverse applications

10th June 2016

Jordan Mulcare

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For applications requiring miniature receptacles, Mill-Max offers four diverse, off-the-shelf products which will fulfill those needs. These receptacles are suitable for use in high density configurations down to 1mm pitch. Each receptacle contains our three-finger, beryllium copper contact with a diameter range of 0.008 to 0.013”. The contact is characterized by a low insertion force making it compatible with miniature leads subject to bending.

Two of the receptacles, 0439-0-15-15-04-27-04-0 and 8210-0-15-15-04-27-04-0, have solder tails for through-hole applications. The tail diameters, 0.014” and 0.012” respectively, minimise the size of the PCB holes to accommodate tight pitch layouts. The 0439 provides an above board height of 0.090” while the 8210 sits at 0.100”. Both of these receptacles have press-fit features suitable for mounting in insulators to make connectors.

The 4428-0-43-15-04-14-10-0 receptacle is a low profile, solder mount, open bottom receptacle fitted with Mill-Max’s Organic Fibre Plug. The OFP provides a temporary solder barrier preventing solder paste from entering the contact area during assembly for paste-in-hole reflow soldering. After assembly, the fibre plug is knocked out when the mating lead is plugged in; the now open bottom allows long leaded devices to pass through. The 4428 series is available in bulk or on tape & reel for automatic assembly.

The last of the four receptacles is the 9928-0-15-15-04-27-40-0. It is a SMT receptacle mainly used for 1mm grid socket configurations such as in BGA socket and adapter pairs. The small 0.016” diameter base of the receptacle is suitable for 1 mm grid PCB layouts and the 0.090” height helps to keep overall packaging profiles to a minimum.

The receptacle shells are made from brass alloy and, like all Mill-Max pins, are high-speed machined to precision tolerances. The inner contact is press-fit into the receptacle shell forming a gas-tight connection. It is precision stamped from beryllium copper strip and heat-treated to provide excellent spring and electrical properties. All four receptacles have a current rating of 2A.

Both the receptacle shells and contacts are gold-plated providing the highest interconnect reliability, corrosion protection and wear resistance.