USB micro AB receptacle — the one that accepts both plug types
The Molex 475901001 is a USB micro AB receptacle from the 47590 series, a 5-contact surface-mount right-angle connector designed for board-edge mounting. Its defining feature is the micro AB form factor: unlike a standard micro B receptacle, this port accepts both micro A and micro B plugs, making it the correct mating half for devices that support USB On-The-Go (OTG) host/client switching. The 5 contacts carry the standard USB 2.0 signal set (VBUS, D+, D-, ID, and GND), with the ID pin grounded to signal host mode or left floating for peripheral mode. Rated 1A and 1.8A per contact at 30VAC over -35°C to 85°C. Gold-plated contacts and a shielded steel/stainless shell support 10,000 mating cycles — an order of magnitude above typical consumer USB connectors, which usually spec 5,000 to 10,000 cycles. This cycle life suits industrial handhelds, test equipment, or any device where the USB port sees frequent field connection and disconnection.
10,000 mating cycles is a high-reliability spec for a micro USB connector. Standard micro B receptacles in consumer gear typically rate 5,000 cycles. The gold plating prevents fretting corrosion at the contact interface over those cycles. The ID pin (contact 4) is what differentiates micro AB from micro B. In a micro AB receptacle, the ID pin is connected to the device's USB controller. When a micro A plug (which shorts ID to GND) is inserted, the device acts as host. When a micro B plug (ID floating) is inserted, the device acts as peripheral. This pinout is standard per the USB OTG specification and is not a Molex-specific variation.