The JST UB-MC5BR3-M04-4S-TB NMP is a USB micro B receptacle from the JST UB series, designed for applications requiring a compact, high-cycle USB 2.0 interface. The gold contact finish supports the 10,000 mating cycle rating — that cycle life is well above the typical 5,000-10,000 cycles for a standard micro USB connector, making this part suited for devices that see frequent plug/unplug duty like handheld test equipment, data loggers, or industrial control panels where the USB port is used for daily configuration downloads.
Mounting and Board Layout
This receptacle mounts via a board cutout with surface-mount solder tails — the mid-mount feature means the connector body sits at a specific height relative to the PCB edge, so the board cutout dimensions and the connector's locating pegs must match the footprint exactly. The solder retention feature adds extra hold-down tabs that get soldered to the board to resist shear forces from cable insertion and removal. Unshielded, so no metal shell to ground; the steel, stainless shell material is for mechanical retention only, not EMI containment.
Current Rating — What the Numbers Mean
The current rating is listed as 0.5A, 1A, 1.8A — this likely reflects derating by pin or by duty cycle. In a USB micro B connector, the VBUS pin (pin 1) carries the bulk of the current, while the signal pins handle far less. The 1.8A figure is probably the maximum for the power pin alone under continuous DC, with the lower figures representing per-contact limits when multiple pins carry current simultaneously.