In this post let us know about HDMI Pinout, HDMI connector types and more. Totally there are five HDMI connector types. They are A, B, C, D, and E. The types A and B are specified in the HDMI 1.0 version. C type is defined in the 1.3 specifications. Subsequently, in 1.4, specifications D and E are defined. The HDMI pinout and pin configuration of each connector type is defined and remains the same. Therefore they are backward compatible. And there won’t be a compatibility issue.
There are 19 pins in type A. Type B has 29 pins in total. Since connector B carries the second TMDS link, it is a little bulky. It supports very high-resolution displays for those who use dual-link.
Type C is a mini connector. And it is smaller than type A. But have the same 19 pin configuration. Type D is a micro connector similar to the micro USB connector. It has 19 pins. It is similar to types A and C, but the pin assignment is different from both A and B.
Type D is exclusively meant for automotive connection systems. It has a unique locking tab to keep the cable firmly connected. It has 19 contact pins. It is of horizontal pitch, 2-row, 19 position-pins.
The connectors are of impedance matching design. They are compatible with high-speed transmission.
The HDMI pin specification is more important to the manufacturers to make cables and other devices with uniformity. The particular type of HDMI connectors cannot mate with the connectors of different types. Therefore no issues of cross-connection and having signals on the wrong lines.
HDMI Pinout Explained
Generally, pins 1-12 carry the TMDS data transmission. It includes video, audio, and auxiliary data information. They form four separate channels for video data, clock data. These data are organized into three categories. They are the Video data period, Data island period, and Control period.
The pins 1-3 carry data channel 2(+ – ground or data shield). The pins 4-6 carry data channel 1(+ – ground or data shield).
The pins 7-9 carry data channel 0(+ – ground or data shield). The pins 10-12 carry the clock data channel that synchronizes the signals (+ – ground or data shield).
Pin 13 carries CEC. CEC establishes bi-directional communication through this pin. And it can connect and control a maximum of 15 devices. The pins 15- 17 carry DDC data. Pin 14 is kept as reserved for future specification updates. Pin 18 is allotted to use the 5V low voltage power provided by the source device. Pin 19 is for hotplug detection. It will help the device to reinitialize the DDC when you are reconnecting the cables. It monitors power and plugs and unplugs events.
Type A and Type E Connector Pin Assignment:
Type A is widely used in many applications. It present in TVs, Recorders, Set-top Boxes Blue Ray disc players and more. The male connector of type “A” external dimension is 13.9mmx4.45mm. And the receptacle or female connector’s internal dimension is 14mmx4.55mm. The A-type connector pinout has two rows of pins with alternate numbering down the length of the connector. Therefore the first row starts with the first pin and ends in the 19th pin. Whereas the second row begins with the 2nd pin and ends with the 18th pin. Type A supports all HDTV modes.
|Row||Pin Number||Pin Assignment|
|Pin 1||TMDS Data2+|
|First Row||Pin 3||TMDS Data2−|
|Pin 5||TMDS Data1 Shield|
|Pin 7||TMDS Data0+|
|Pin 9||TMDS Data0−|
|Pin 11||TMDS Clock Shield|
|Pin 15||SCL Serial Clock for DDC|
|Pin 17||Ground (for DDC, CEC, ARC, and HEC|
|Pin 19||Hot Plug Detect|
|Pin 2||TMDS Data2 Shield|
|Second Row||Pin 4||TMDS Data1+|
|Pin 6||TMDS Data1−|
|Pin 8||TMDS Data0 Shield|
|Pin 10||TMDS Clock+|
|Pin 12||TMDS Clock−|
|Pin 14||Reserved Utility|
|Pin 16||SDA Serial Data for DDC|
|Pin 18||+5 V|
Type B Connector Pin Assignment:
Type B connector external dimension is 21.2 mm x 4.45 mm. It has 29 pins. And it carries six differential pairs instead of three. This type of connector is used for high-resolution displays. It is designed to support resolutions higher than 1080p. However, the use of the additional three differential pairs is reserved. It is electrically compatible with dual-link DVI D. But, it is not commercially employed in any device. The type B connector is one and half times wider. It can carry twice the data as Type A. Type B is a higher resolution version of type A. The Shell will have the dimple for locking.
|5||TMDS Data1 Shield|
|First Row||7||TMDS Data0+|
|11||TMDS Clock Shield|
|17||TMDS Data4 Shield|
|23||Reserved (N.C. on device|
|29||Hot Plug Detect|
|2||TMDS Data2 Shield|
|8||TMDS Data0 Shield|
|Second Row||10||TMDS Clock+|
|14||TMDS Data5 Shield|
|20||TMDS Data3 Shield|
|24||Reserved (N.C. on device)|
Type C Connector Pin Assignment:
It is a mini connector. And it is smaller than the TypeType A. The plugs’ external dimension is 10.42mmx2.42mm. The Shell of the connector has a spring for locking. Additional springs may be used for EMI reduction. The spring property for locking shall be activated by the locking hole of the plug shell. It also has the same 19 pin configuration as like Type A.
The only difference is it is meant for portable devices. Therefore all positive signals of the differential pairs are swapped with their corresponding shields. The CEC ground is assigned to pin 13. Besides, CEC is assigned to 14 instead of pin 13. Pin 17 is reserved. The Type C Mini connector can be connected to a type A connector using a type A-to-type C cable.
|1||TMDS Data2 Shield|
|7||TMDS Data0 Shield|
|First Row||11||TMDS Clock+|
|19||Hot Plug Detect|
|4||TMDS Data1 Shield|
|Second Row||8||TMDS Data0+|
|10||TMDS Clock Shield|
Type D Connector Pin Assignment:
|1||Hot Plug Detect|
|7||TMDS Data1 Shield|
|First Row||9||TMDS Data0+|
|13||TMDS Clock Shield|
|4||TMDS Data2 Shield|
|Second Row||10||TMDS Data0 Shield|
Connector Contact Sequence:
|Connection||Type A & C Connectors||Type B Connector||Type D Connector||Type E Connector|
|First Make||Connector shell||Connector shell||Connector shell||Connector shell|
|Second Make||Pins 1 – 17 and pin 19||Pins 1 – 27 and pin 29||Pins 1 – 18||Pins 1 – 19|
|Third Make||Pin18 (+5V Power)||Pin28 (+5V Power)||Pin19 (+5V Power)|