Thunderbolt 1 and 2 use the Mini DisplayPort physical connector to combine PCIe and DisplayPort signals. Thunderbolt 1 provides 10 Gbps (two 5 Gbps channels); Thunderbolt 2 bonds them for 20 Gbps. Supports daisy-chaining up to 6 devices.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | GND | Ground | GND |
| 2 | HPD | Hot plug detect | I/O |
| 3 | TX0n | PCIe TX lane 0 negative | BUS |
| 4 | GND | Ground | GND |
| 5 | TX0p | PCIe TX lane 0 positive | BUS |
| 6 | GND | Ground | GND |
| 7 | RX0n | PCIe RX lane 0 negative | BUS |
| 8 | GND | Ground | GND |
| 9 | RX0p | PCIe RX lane 0 positive | BUS |
| 10 | GND | Ground | GND |
| 11 | TX1n | PCIe TX lane 1 negative | BUS |
| 12 | GND | Ground | GND |
| 13 | TX1p | PCIe TX lane 1 positive | BUS |
| 14 | GND | Ground | GND |
| 15 | RX1n | PCIe RX lane 1 negative | BUS |
| 16 | GND | Ground | GND |
| 17 | RX1p | PCIe RX lane 1 positive | BUS |
| 18 | GND | Ground | GND |
| 19 | AUX p | DP auxiliary channel positive | BUS |
| 20 | AUX n | DP auxiliary channel negative | BUS |
Thunderbolt 1 and 2 use the Mini DisplayPort physical connector to combine PCIe and DisplayPort signals. Thunderbolt 1 provides 10 Gbps (two 5 Gbps channels); Thunderbolt 2 bonds them for 20 Gbps. Supports daisy-chaining up to 6 devices.