DVI Pinout: TMDS Data 1- Pin Number

This article identifies the exact pin number used for the TMDS Data 1- signal within a standard DVI connector and explains its role in digital video transmission. You will learn which pin carries the negative differential signal for the primary green channel, how it pairs with other pins, and where it fits within the DVI architecture.

The TMDS Data 1- Pin Number

The exact pin number for TMDS Data 1- on a DVI connector is Pin 9.

In the standard 24-pin DVI layout (found in DVI-D and DVI-I configurations), pins are organized into three rows of eight pins. Pin 9 is the first pin on the left of the middle row when viewing the female receptacle (or the connector face).

Role in Video Transmission

DVI uses Transition-Minimized Differential Signaling (TMDS) to transmit high-speed digital video data over twisted pairs. Each color channel requires a positive line, a negative line, and a shield line to cancel electromagnetic interference and reduce noise.

• Pin 9: TMDS Data 1- (Negative Differential Line)
• Pin 10: TMDS Data 1+ (Positive Differential Line)
• Pin 11: TMDS Data 1/3 Shield (Ground reference and shielding)

Together, Pin 9 and Pin 10 form the differential pair for TMDS Data Channel 1. In standard 24-bit RGB video over a single-link DVI connection, Channel 1 is responsible for carrying the digital green color data.