The 39281023 is CONN HEADER 2POS 4.2MM VERT TIN, that includes Natural Color, they are designed to operate with a Mini-FitR Jr? 5566 Series, Packaging is shown on datasheet note for use in a Tray, that offers Termination features such as Solder, Mounting Type is designed to work in Through Hole, as well as the Header, Shrouded Connector Type, the device can also be used as Tin Contact Finish. In addition, the Contact Finish Thickness is 35μin (0.90μm), the device is offered in 2 Number of Positions, the device has a All of Number of Positions Loaded, and Number of Rows is 2, and the Contact Type is Male Pin, and Row Spacing is 0.165" (4.20mm), and the Fastening Type is Locking Ramp.

39277023 with user guide, that includes Number of Rows, they are designed to operate with a Number of Positions.

39277033 with circuit diagram, that includes Number of Positions, they are designed to operate with a Number of Rows.

The 39-28-1023 is CONN HEADER 2POS 4.2MM VERT TIN manufactured by MOLEX. The 39-28-1023 is available in RECTANGULAR PLASTIC MINI FIT Package, is part of the Rectangular Connectors - Headers, Male Pins, , and with support for CONN HEADER 2POS 4.2MM VERT TIN, Conn Power HDR 2 POS 4.2mm Solder ST Thru-Hole 2 Terminal 1 Port Mini-Fit Jr Bag, Headers & Wire Housings 2 CKT VERT HEADER.