HDMI Pinout Diagram and 19-Pin Signal Map
19-pin rectangular connector
Standards: HDMI 1.4, HDMI 2.0, HDMI 2.0b, HDMI 2.1, HDMI 2.1a, HDCP 2.3
What is the HDMI Type A pinout?
The HDMI Type A Connector has 19 pins. Pin 1 is TMDS 2+ (data). Pin 2 is Shield (shield). Pin 3 is TMDS 2- (data). Pin 4 is TMDS 1+ (data). Plus 15 more pins.
Standards: HDMI 1.4, HDMI 2.0, HDMI 2.0b, HDMI 2.1, HDMI 2.1a, HDCP 2.3
Pin Assignment Table
| Pin | Signal | Type | Description |
|---|---|---|---|
| 1 | TMDS 2+ | data | TMDS Data 2+ (Red channel in RGB mode) |
| 2 | Shield | shield | TMDS Data 2 Shield |
| 3 | TMDS 2- | data | TMDS Data 2- (Red channel in RGB mode) |
| 4 | TMDS 1+ | data | TMDS Data 1+ (Green channel in RGB mode) |
| 5 | Shield | shield | TMDS Data 1 Shield |
| 6 | TMDS 1- | data | TMDS Data 1- (Green channel in RGB mode) |
| 7 | TMDS 0+ | data | TMDS Data 0+ (Blue channel in RGB mode) |
| 8 | Shield | shield | TMDS Data 0 Shield |
| 9 | TMDS 0- | data | TMDS Data 0- (Blue channel in RGB mode) |
| 10 | Clock+ | data | TMDS Clock+ (Pixel clock for synchronization) |
| 11 | Shield | shield | TMDS Clock Shield |
| 12 | Clock- | data | TMDS Clock- (Pixel clock for synchronization) |
| 13 | CEC | data | Consumer Electronics Control - Single-wire bidirectional bus for device control (volume, power, input switching) |
| 14 | Util | reserved | Utility / HEAC+ / ARC - Audio Return Channel for TV audio to soundbar, eARC in HDMI 2.1 |
| 15 | SCL | data | I2C Serial Clock (DDC) - 100kHz clock for EDID/HDCP communication |
| 16 | SDA | data | I2C Serial Data (DDC) - Bidirectional data for EDID/HDCP |
| 17 | GND | ground | DDC/CEC Ground - Ground reference for control signals |
| 18 | +5V | power | +5V Power (min 55mA, max 500mA) - Powers EDID EEPROM in displays and passive adapters |
| 19 | HPD | data | Hot Plug Detect / HEAC- - Sink pulls high (>2.4V) when ready, triggers source to read EDID |
Signal Types
Common Applications
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Use the pinout as a working reference now, then jump to the full library or the next workflow when you need it.
Browse more connector references →The HDMI Type A connector has 19 pins: Pin 1 (TMDS 2+), Pin 2 (Shield), Pin 3 (TMDS 2-), and Pin 4 (TMDS 1+). Plus 15 more pins. Common in Home Theater and PC Monitors.
HDMI Type A Pinout Guide
HDMI (High-Definition Multimedia Interface) is the universal standard for transmitting uncompressed digital video and audio between devices. The Type A connector (standard full-size) has 19 pins and uses TMDS (Transition Minimized Differential Signaling) for video data transmission. HDMI supports multiple connector sizes: Type A (standard, 13.9mm), Type C (Mini HDMI, 10.42mm), and Type D (Micro HDMI, 6.4mm), all carrying the same 19 signals. The connector carries three TMDS data channels (RGB or YCbCr), one TMDS clock channel, DDC (I2C) for EDID communication, CEC for device control, and HPD for hot-plug detection.
Wiring Tips & Best Practices
HDMI cables require precise construction for reliable operation at high bandwidths. The TMDS pairs (Pins 1/3, 4/6, 7/9, 10/12) must be individually shielded twisted pairs with 100 ohm differential impedance. For HDMI 2.1 at 48 Gbps (Ultra High Speed cables), use certified cables to ensure 4K@120Hz or 8K@60Hz compatibility. The DDC channel (Pins 15/16) uses I2C protocol at 100 kHz for EDID communication between source and sink. Pin 18 (+5V) provides power for EDID chips in passive adapters and must supply at least 55mA at 5V.
Common Issues
HDCP (High-bandwidth Digital Content Protection) handshake failures cause blank screens or purple/green artifacts when playing protected content. Ensure all devices in the chain support the same HDCP version. ARC (Audio Return Channel) on Pin 14 only works when enabled in both TV and soundbar settings, and requires an ARC-compatible HDMI cable. eARC requires HDMI 2.1 cables and compatible ports for full Dolby Atmos passthrough. CEC (Pin 13) brand implementations vary - Samsung Anynet+, LG SimpLink, Sony Bravia Sync may have compatibility issues between brands. Long cable runs (over 5m for passive cables at 4K@60Hz) require active cables with built-in signal boosters. EDID issues causing wrong resolution or no signal can often be fixed with EDID emulators or by power cycling devices in sequence.
Why Use Interactive Diagrams?
- Accuracy: Hover over pins to see exact signal names and descriptions
- Clarity: Color-coded by signal type (power, ground, data)
- Printable: Export clean diagrams for shop floor reference