Miniature receptacles are for high-density configurations
For applications requiring miniature receptacles, Mill-Max offers four off-the-shelf products, suitable for use in high density configurations down to 1mm pitch.
Each receptacle contains a three-finger, beryllium copper contact with a diameter range of 0.008 to 0.013inch (0.2 to 0.33mm). The contact is characterised by a low insertion force making it compatible with miniature leads subject to bending.
Two 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 0.012inch (0.356 and 0.305mm) respectively, minimise the size of the PCB holes to accommodate tight pitch layouts. The 0439 provides an above board height of 0.090inch (2.286mm) while the 8210 sits at 0.1inch (2.54mm). Both 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 the company’s Organic Fibre Plug (OFP). The plug 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 and reel for automatic assembly.
The final receptacle 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 0.016inch (0.406mm) diameter base of the receptacle is for 1mm grid PCB layouts and the 0.09inch (2.286mm) height helps to keep overall packaging profiles to a minimum.
The receptacle shells are made from brass alloy and are high-speed machined to precision tolerances, says the company. 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 spring and electrical properties. All four receptacles have a current rating of 2A.
Both the receptacle shells and contacts are gold-plated providing interconnect reliability, corrosion protection and wear resistance, says the company.