The Universal Serial Bus (USB) was developed to integrate a variety of existing PC I/O ports into a single interface with hot-plugging, automatic configuration capabilities and increased bandwidth to enhance serial I/O throughput for a wide range of peripherals like printers, scanners, digital cameras and other human interface devices. Up to 127 different peripherals can be connected to this common interface standard.
The standard 'A' Series of receptacles are available in right angle single and stacked dual-port through hole versions. Molex offers an SMT right angle single-port version as well. The upright single port versions include the upright, upright flange-out kinked boardlock/forklock versions, upright with reinforced cover and upright without-back-cover versions for various applications. Series 'A' connectors plug directly into the downstream port receptacles on the USB host or hub.
The standard Series 'B' connectors, roughly square with bevelled corners, plug into upstream receptacles on a USB device or hub. The range includes both vertical and right angle version receptacles. The vertical versions include the dual kinked boardlock as well as the dual-pair boardlock straight tab versions designed for specific requirements. Short body versions are are available where PCB real estate poses constraint.
The basic characteristics of all 'A' and 'B' receptacles include having a metal shell to provide for excellent EMI/RFI protection and PCB hold-downs, while some have specially designed features such as mounting flanges for front-panel grounding, cantilever grounding fingers for plug locking and retention, and solder-tail stabilizers. All connectors, however, meet specifications of an electrical rating of 1.0 Amp per contact and are designed to endure at least 1,500 mating cycles.