The YubiKey 5 NFC FIPS is the FIPS-validated sibling of the standard 5 NFC. Under the hood it is the same hardware key; what you are paying for is the certification. It carries FIPS 140-3 validation, the current US federal standard that replaces the 140-2 generation now being retired. If your controls, contracts or auditors call for a validated authenticator, this is the version that satisfies the line item.
Everything else matches the non-FIPS key. On firmware 5.7 it speaks the full range of protocols: FIDO2/WebAuthn for passkeys, FIDO U2F, PIV smart card, OATH-TOTP and OATH-HOTP, OpenPGP, YubiKey OTP, static password, and HMAC-SHA1 challenge-response. That breadth means one key can cover phishing-resistant sign-in to Microsoft 365 and Entra ID today and still handle older smart-card or OTP systems you have not retired yet.
The form factor is a keychain-sized key with a USB-A connector plus NFC, so it plugs into an older desktop fleet and also taps against a phone. There is no battery and there are no moving parts, and it is crush- and water-resistant, which matters when a key lives on a lanyard or in a pocket for years.
Our take: buy this when a FIPS requirement is genuinely on the paperwork. Regulated buyers, government and IRAP-scoped environments, and anyone whose framework names FIPS 140-3 need the validated part. The 140-2 retirement is a good reason to specify 140-3 now rather than inherit a soon-to-be-legacy certification.
If you have no such requirement, the standard YubiKey 5 NFC is the same hardware with less procurement friction, so do not pay for a certification you will never cite. And if your fleet has moved to USB-C, choose the USB-C member of the FIPS series rather than reaching for adapters.
