J-USB
Mini-USB
Connector
Mini-B USB receptacle, surface mount
USB / power port
About this component
The only USB connection on the Nano: it carries data to the USB-serial chip and supplies 5 V when no VIN supply is present. The surface-mount shell is easily torn off the board by cable strain, so check its solder joints and the 5 V path behind it first when the board is dead on USB. Part variants: The Nano 2.3 BOM lists Molex 67503-1020 (Mini-B, right angle); not confirmed for the 3.x board.
What it does on this board
Programming and 5V power input.
Pinout & readings
No pinout or reference readings yet — these show what each pin does and what a healthy part should measure.