Physical Attributes

The serial number is printed on the back of every YubiKey in the YubiKey 5 Series, YubiKey 5 FIPS Series, YubiKey 5 CSPN Series and YubiKey Bio Series. The 2D barcode (QR code) of the serial number is also printed on the back of every YubiKey in the 5 (FIPS/CSPN) Series except the 5C Nano form factor, which is too small to accommodate the 2D barcode.

Additionally, all of the keys in the YubiKey 5 FIPS Series have the acronym “FIPS” underneath the QR code on the back, along with “v5” running up the left side of the QR code, except on the YubiKey 5C Nano, where it runs down the right side.

All current YubiKeys have been IP68-rated under the IEC standard 60529.

YubiKey 5 NFC

Important

The attributes listed below also apply to the YubiKey 5 NFC FIPS, YubiKey 5 NFC CSPN, Security Key NFC, and the Security Key NFC - Enterprise Edition.

Dimensions: 18mm x 45mm x 3.3mm
Weight: 3g
Physical Interfaces: USB, NFC
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

YubiKey 5 Nano

Important

The attributes listed below also apply to the YubiKey 5 Nano FIPS, and the YubiKey 5 Nano CSPN.

Dimensions: 12mm x 13mm x 3.1mm
Weight: 1g
Physical Interfaces: USB
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

YubiKey 5C

Important

The attributes listed below also apply to the YubiKey 5C FIPS and the YubiKey 5C CSPN.

Dimensions: 12.5mm x 29.5mm x 5mm
Weight: 2g
Physical Interfaces: USB
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

YubiKey 5C Nano

Important

The attributes listed below also apply to the YubiKey 5C Nano FIPS and the YubiKey 5C CSPN.

Dimensions: 12mm x 10.1mm x 7mm
Weight: 1g
Physical Interfaces: USB
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

YubiKey 5Ci

Important

The attributes listed below also apply to the YubiKey 5Ci FIPS and the YubiKey 5Ci CSPN.

Dimensions: 12mm x 40.3mm x 5mm
Weight: 2.9g
Physical Interfaces: USB, Lightning®
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

YubiKey 5C NFC

Important

The attributes listed below also apply to the YubiKey 5C FIPS, YubiKey 5C NFC CSPN, Security Key C NFC, and the Security Key C NFC - Enterprise Edition.

Dimensions: 18mm x 45mm x 3.7mm
Weight: 4g
Physical Interfaces: USB, NFC
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

YubiKey Bio Series

The YubiKey Bio - FIDO Edition is available in the USB-A format, while the YubiKey C Bio - FIDO Edition is available in the USB-C format, both with a maximum transfer rate of 12 Mbps.

The sensors and LEDs behave the same way in both formats.

YubiKey Bio - FIDO Edition

YubiKey C Bio - FIDO Edition

Sensors

The YubiKey Bio recognizes two interactions, one a touch, and the other a fingerprint. Its recognition of the fingerprint - or lack thereof - is communicated through the LEDs (see LED Behavior).

On the YubiKey Bio, the silver-colored bezel encircling the fingerprint sensor provides the grounding plane required to read the fingerprint.

Biometric Touch:
	When prompted to have the YubiKey Bio read your fingerprint from the fingerprint sensor, be sure to touch at least a tiny part of the ring. If you use your little finger to touch only the center of the fingerprint sensor, the key will not read the fingerprint.
Plain Touch:	When prompted to touch the YubiKey Bio but not explicitly asked for the fingerprint, touch both the bezel and the fingerprint sensor, even though the fingerprint will not be read.

Tips provides detailed instructions on using the fingerprint sensor.

LEDs

The YubiKey Bio has a green LED and an amber LED to provide direct feedback, flashing when the key is ready for interaction or communicating something about the interaction. LED Behavior provides detailed descriptions.

Ratings

The YubiKey Bio has been IP68-rated under the IEC standard 60529.

Care and Cleaning

To clean the YubiKey and sensor, use only wipes impregnated with no more than 70% isopropyl alcohol.

Operational Data

Dimensions
- YubiKey A Bio: 18mm x 45mm x 3.35mm
- YubiKey C Bio: 18mm x 45mm x 3.75mm
Weight: YubiKey Bio A: 4.5g; YubiKey Bio C: 5.0g
Operating Temperatures: 0 °C - 40 °C (32 °F - 104 °F)
Storage Temperatures: -20 °C - 85 °C (-4 °F - 185 °F)

FIPS-specific Marking

CSPN-specific Marking

Security Key Series Marking

The color of the non-Enterprise edition of the Security Key Series was changed to black in January 2023. To distinguish the Security Key Series from the YubiKey 5 Series, “FIDO” is inscribed on the back.

Like the non-Enterprise edition of the Security Key Series, the Enterprise edition of the Security Key Series also has “FIDO” inscribed on the back to distinguish them from a YubiKey 5 Series. In addition, the serial number is inscribed on the back of each key in the Enterprise edition of the Security Key Series.

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