UK The short version
Thunderbolt is a high-speed interface developed by Intel, and USB-C is the connector it has used since Thunderbolt 3 in 2015. So the comparison is not like for like: one is a protocol, the other is a plug and socket.
Every Thunderbolt 3, 4 or 5 port is a USB-C port and works with ordinary USB-C devices. The reverse is not true. A USB-C port without Thunderbolt support may run at anything from USB 2.0 at 480 Mb/s to USB4 at 40 Gb/s, and may or may not output video or accept power. A Thunderbolt port guarantees a minimum set of features, which is the real difference.
Why one connector carries both
Thunderbolt 1 and 2 used the Mini DisplayPort connector, which limited them mostly to Apple computers and specialist peripherals. With Thunderbolt 3, Intel moved to USB-C so that one port could serve both Thunderbolt and USB devices. Intel later contributed the Thunderbolt 3 protocol to the USB Implementers Forum, where it became the basis of USB4. That shared history is why Thunderbolt 4 and USB4 look so alike on paper, and why the same oval socket now covers everything from a phone charger to an external PCIe enclosure.
How Thunderbolt and USB-C compare
The table compares a Thunderbolt 4 port with the range of what a USB-C port can be. Thunderbolt 5 doubles the Thunderbolt figures.
| Feature | USB-C port (not Thunderbolt) | Thunderbolt 4 port | Thunderbolt 5 port |
|---|---|---|---|
| Data rate | 480 Mb/s to 40 Gb/s, depending on the controller | 40 Gb/s | 80 Gb/s, up to 120 Gb/s one way |
| Video | Optional, via DisplayPort Alt Mode | Required: two 4K displays or one 8K | Required: two 6K displays |
| PCIe | Only on USB4 hosts that support tunnelling | Required, 32 Gb/s | Required, 64 Gb/s |
| Laptop charging | Optional, via USB Power Delivery | Required on at least one port, up to 100 W | At least 140 W on a charging port, up to 240 W |
| Daisy chaining | Through hubs only | Hubs with up to four Thunderbolt ports | Hubs with up to four Thunderbolt ports |
| Certification | USB-IF, optional | Intel, mandatory | Intel, mandatory |
The Thunderbolt figures are the minimums Intel requires for certification. USB-C ports are not held to any minimum beyond the USB standard they implement, so two USB-C ports on the same computer can behave differently.
How to tell the ports apart
On the outside the sockets are identical. The clues are the marking next to the port and the specification sheet.
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Lightning bolt icon. Marks a Thunderbolt port. A number beside it, such as 4 or 5, gives the generation.
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USB speed logo. Ports marked USB 10Gbps, USB 20Gbps or USB 40Gbps are USB-C ports at that speed, not Thunderbolt.
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DisplayPort logo. Marks a USB-C port that outputs video through DisplayPort Alt Mode.
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No marking. Often a USB 2.0 or USB 3.2 port, especially on compact and embedded boards. Check the datasheet before planning a display or dock on it.
Thunderbolt and USB-C cables
Cables follow the same pattern as ports. A Thunderbolt 4 or 5 cable is a fully featured USB-C cable and works for USB, charging and video. A typical USB-C charging cable carries only USB 2.0 data, so a Thunderbolt device on it either falls back to USB or does not work at all.
Passive Thunderbolt 4 cables carry the full 40 Gb/s up to about 2 m, and Thunderbolt 5 cables carry 80 Gb/s at around 1 m. Longer runs need active cables. For any link where speed matters, use the certified cable with the lightning bolt and generation number printed on the plug.
The same rule works in reverse when buying spares. A Thunderbolt cable is the safest single cable to keep on hand, because it will do everything a USB-C cable can, while a cheap USB-C cable may only charge.
Which to choose for an industrial system
For most industrial peripherals, such as touchscreens, barcode scanners, keyboards and USB cameras, an ordinary USB-C or USB-A port is enough. Thunderbolt earns its place where one cable has to carry very high bandwidth to an external device.
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External PCIe and storage. Thunderbolt NVMe enclosures, 10 Gigabit Ethernet adapters and external GPU or capture enclosures need the guaranteed PCIe bandwidth.
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Several displays from a compact computer. A Thunderbolt dock can add two 4K monitors and a network port through one connection.
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Single-cable touch displays. Where only video, touch and power are needed, a USB-C port with DisplayPort Alt Mode is enough, as on our USB-C touch monitors.
Quick answers on Thunderbolt vs USB-C
Thunderbolt ports appear mainly on compact systems built on recent Intel processors, including several of our industrial NUC PCs. Where a system will be on a vehicle or a vibrating machine, an internal PCIe video capture card is usually more secure than an external Thunderbolt capture device, because a USB-C plug is held only by friction.
Thunderbolt vs USB-C: common questions
Is Thunderbolt the same as USB-C?
No. Thunderbolt is an interface and USB-C is the connector it uses. Thunderbolt ports accept USB-C devices, but USB-C ports do not all support Thunderbolt.
Is Thunderbolt 4 the same as USB-C?
It uses USB-C, with guarantees on top. Thunderbolt 4 promises 40 Gb/s, two 4K displays, PCIe and charging. A USB-C port promises only the connector.
Can I plug a USB-C device into a Thunderbolt port?
Yes. Thunderbolt 3, 4 and 5 ports support USB devices, which run at their own USB speed.
Will a Thunderbolt device work in a USB-C port?
Sometimes. Many Thunderbolt 4 docks fall back to USB on a non-Thunderbolt port with reduced features. Thunderbolt-only devices, such as many PCIe enclosures, need a Thunderbolt or compatible USB4 host.
What does a Thunderbolt cable look like?
Like a USB-C cable, with a lightning bolt on the plug. The generation number is usually printed next to it.
We specify the ports, cables and docks for each system we supply and validate them before it ships as standard, so a display or storage device runs on the port it was planned for.