Physical Interfaces: USB, NFC, Apple Lightning®

We refer to the ways that a computer, phone, tablet, etc. can connect with a YubiKey as the physical interfaces.


All of the models in the YubiKey 5 (FIPS/CSPN) Series provide a USB 2.0 interface, regardless of the form factor of the USB connector. The YubiKey presents itself as a USB composite device in addition to each individual USB interface.

USB A and USB C connectors are supported.

The USB PID and iProduct string changes depending on which of the USB interfaces are enabled. They are described in the YubiKey USB ID Values Guide.

For more information, see Understanding the USB Interfaces.

Apple Lightning®

The YubiKey 5Ci presents itself as an Apple iOS peripheral. It is able to interact with:

  • Any iOS app using the Yubico YubiKey iOS SDK.
  • Any app input data field through the touch-triggered OTP.
  • Any WebAuthn-compliant application (starting in iOS 13). This includes the Safari browser.

When connecting the YubiKey 5Ci through Lightning®, the interfaces enabled setting is common to both USB-C and Lightning®. Enabling or disabling an interface applies to both connections.


Developers: Enabling apps within iOS to use advanced protocols that send and receive information from the YubiKey 5Ci requires that you:

The USB and iProduct strings that are displayed when connecting through Lightning® or USB are specific to the connection type. They are described in the YubiKey USB ID Values guide.


The YubiKey 5 NFC and YubiKey 5C NFC provide an NFC wireless interface in addition to USB. The YubiKey 5 NFC and YubiKey 5C NFC include the RFID standard specific to the ISO/IEC 14443-A and ISO/IEC 14443-4 NFC format. RFID implementations not included in the listed ISO standards are not supported.

The NDEF URI has been updated to a new format, follow the link below for an example of the new format. The <OTP> value is replaced with the OTP generated by the YubiKey.

For operations that require a touch, all touch requests within the first 20 seconds of the operation succeed. After a period of inactivity, a YubiKey placed on a desktop NFC reader may power down to help prevent unintended access. To regain connectivity with an NFC reader, remove the YubiKey from the reader and reposition it on the reader. Some NFC readers may power-cycle and in doing so, prevent the YubiKey from powering down.

To contact Yubico Support, submit a request.