USB / HDMI / DP Pinout
Pin reference for USB-A, USB-B, USB-C, HDMI Type A and DisplayPort.
Overview
The USB, HDMI and DisplayPort Pinout reference shows the pin layout and signal assignments for USB Type A, USB Type B, USB Type C, HDMI Type A and DisplayPort connectors. Each row in each connector's pin table lists the pin number, the signal name, the direction and a short note (data lane, power, ground, configuration).
It is built for makers building custom cables, repair technicians probing a failed port and engineers designing a daughterboard that breaks out specific signals. Long-tail queries it covers include "USB-C pinout 24 pin", "HDMI pin assignments", "DisplayPort 20-pin pinout", and "USB Type B pin order".
How it works
The reference is a static dataset assembled from the official USB-IF, HDMI Licensing Administrator and VESA specifications. USB-A and USB-B have 4 pins (VBUS, D+, D−, GND); USB-C has 24 pins in a fully symmetric flippable arrangement supporting USB 2.0, USB 3.x, USB4 and alternate modes. HDMI Type A has 19 pins covering 3 TMDS data channels, a clock channel, audio return and various utility lines. DisplayPort has 20 pins with 4 main lanes plus auxiliary, hot-plug and config.
Each row identifies whether the pin is power (red), ground (black), data (blue) or configuration (yellow) to match common schematic colour conventions. Pin orientation is given as viewed from the connector face on the host side, with note on which orientation is "right-side up".
Examples
USB-A pin 1 → VBUS (+5V)
USB-A pin 2 → D−
USB-A pin 3 → D+
USB-A pin 4 → GND
USB-C: pins A4/A9/B4/B9 are VBUS; A12/A1/B12/B1 are GND; CC1 and CC2 carry configuration
HDMI pin 1 → TMDS Data2+
HDMI pin 19 → +5V Power
DisplayPort pin 1 → Main Lane 0+
DisplayPort pin 20 → +3.3V power for active cable adapters
FAQ
Why does USB-C have 24 pins?
USB-C supports many simultaneous functions: USB 2.0, USB 3.2 (two pairs of differential lanes), configuration, sideband, VBUS and ground — and the connector is reversible, which doubles many of the pin counts. Not every pin is wired in every cable.
What's the difference between HDMI Type A, C and D?
Type A is the full-size connector (19 pins). Type C is mini-HDMI used on cameras. Type D is micro-HDMI used on phones and tablets. All three carry the same 19 signals; only the physical size differs.
Why can DisplayPort use a USB-C connector?
DisplayPort over USB-C uses the alternate mode feature: the host and cable negotiate, then the USB-C high-speed lanes carry DisplayPort signalling instead of USB. Same connector, different protocol.
Are all USB-C cables the same?
No. A "USB 2.0 only" Type-C cable wires fewer pins than a USB 4 cable. Power-delivery support also varies. Quality marks on the cable indicate the supported standard and current.
What's the difference between HDMI 1.4 and 2.1?
The connector and pin assignments are identical. The newer revisions use the same pins at higher data rates (48 Gb/s for HDMI 2.1) and add features negotiated in software like variable refresh rate.