USB Internal Connector

Key-A 20-Pin USB Front-Panel Connector

The Key-A 20-pin connector is a USB-IF desktop front-panel reference design for linking a motherboard to one USB Type-C port or one Standard-A port.

Characteristics

Document	USB 3.1 / USB Type-C Desktop Front Panel Cable and Connector Implementation Document Rev. 1.1
Pin count	20
Keying	Key-A; mates only with the corresponding Key-A plug/header
Supported front-panel ports	One USB Type-C port or one Standard-A port
Header variants	Shielded and unshielded reference designs; right-angle headers are allowed
Typical use	Desktop motherboard to modern front-panel USB port assembly
Specification scope	USB-IF reference design; explicitly not part of the USB base specifications
Current status	Published USB-IF internal front-panel implementation interface