A low-profile Universal-Serial-Bus (USB) connector includes a substantially flat base structure that is received in the lower section of a conventional female USB connector, and includes metal contacts formed on an upper surface of the base structure. Wobble or vertical play is reduced by rails extending along side edges of the base structure that are partially inserted into gaps formed between the metal case and base structure of the female USB connector. Between metal contacts on the low-profile USB connector are raised ribs (dividers) that prevent undesirable damage or contamination to the metal contacts. The connector base structure of the low-profile USB connector can be separate or can be integrated with a circuit board that holds a flash memory chip and a USB controller chip.