HDMI Connector Pinout: pin connections

The HDMI connector has 19 pins and a defined pinout for the connectors: Type A, B, C, D & E are different


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The HDMI system has five connector types that can be used. The pinout has remained the same for each type since the introduction of each type, ensuring that there are no compatibility issues.

The connectors have 19 pins apart from the Type B which was introduced at the first release, but it has since been overtaken by successive version releases.

HDMI type A connector
HDMI type A connector showing the 19 pin format

The main HDMI connector types include the Type A which is used for most TVs, Type C which is a mini format, a Type D which is a micro format and the Type E which is used for automotive applications and has a retainer and dirt protection.

HDMI Type A connector pinout

The Type A HDMI connector is the most widely used. It is the one that is present on most TV sets, recorders, set top boxes and the like.

The type A connector pinout can be seen to consist of two rows of pins with numbering alternating down the length of the connector so that pins 1 and 2 are at one end and 18 and 19 at the other.

HDMI connector pinout
HDMI Connector Pinout
Pin connections for Type A HDMI connector.
HDMI Pin number Signal
1 TMDS Date 2+
2 TMDS Data 2 shield
3 TMDS Data 2-
4 TMDS Data 1+
5 TMDS Data 1 shield
6 TMDS Data 1-
7 TMDS Data 0+
8 TMDS Data 0 shield
9 TMDS Data 0-
10 TMDS Clock+
11 TMDS Clock shield
12 TMDS Clock-
13 CEC
14 HEC Data-
15 SCL (Serial Clock for DDC
16 SDA (Serial Data Line for DDC
17 DDC / CEC / HEC Ground
18 +5 V Power (50 mA max)
19 Hot Plug Detect (1.3) / HEC Data+ (1.4)

Pinout differences for other connector types

The pinouts for the other types of connector are different to the Type A. The differences are noted below.

  • Type C:   The differences are that all positive signals of the differential pairs are swapped with their corresponding shield, the DDC/CEC Ground is assigned to pin 13 instead of pin 17, the CEC is assigned to pin 14 instead of pin 13, and the reserved pin is 17 instead of pin 14.
  • Type D:   It keeps the standard 19 pins of types A and C, but the pin assignment is different from both


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