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Thunderbolt 1 and 2 cables and adapters

Is there a difference between cables for Thunderbolt 1 and Thunderbolt 2? And could I use the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter (https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter) to connect TB1 to TB3?

iMac 27″, macOS 10.14

Posted on May 7, 2021 12:21 AM

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Question marked as Best reply

Posted on May 13, 2021 1:52 PM

Hi again nilsens,


Thunderbolt 1 and 2 are the same connections, so the cable and adapters are interchangeable. Learn more here: About Apple Thunderbolt cables and adapters.


We hope this helps!

4 replies

May 7, 2021 6:35 PM in response to nilsens

Hi there nilsens,


Thanks for using Apple Support Communities. It sounds like you want to be able to connect a Thunderbolt 3 and Thunderbolt 1 and would like to know if the Apple adapter will work. It will work to connect Thunderbolt 1 and 2 devices with Thunderbolt 3 devices. If you are connecting the adapter to some devices an external power source may be required.


We hope this helps!

Thunderbolt 1 and 2 cables and adapters

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