iCLASS Seos vs MIFARE Plus S / X

iCLASS Seos offers multi-frequency (13.56 MHz, 125 kHz) backwards compatibility with 8 KB memory. MIFARE Plus provides AES-128 with 2-4 KB and EAL4+ certification.

Side-by-side specs

Frequency

iCLASS Seos: 13.56 MHz (Seos and iCLASS), 125 kHz (Prox)
MIFARE Plus S / X: 13.56 MHz

Protocol

iCLASS Seos: ISO/IEC 14443-A (Seos), ISO 15693 (iCLASS), ISO 11784/11785 (Prox)
MIFARE Plus S / X: ISO/IEC 14443 Type A, ISO/IEC 14443-4

Memory

iCLASS Seos: 8 KBytes (Seos), 2k bit or 32k bit (iCLASS), 512 bits (Prox)
MIFARE Plus S / X: 2 kB or 4 kB EEPROM

Interface

iCLASS Seos: RF (contactless)
MIFARE Plus S / X: RF (contactless)

Temp Range

iCLASS Seos: -40°C to +70°C operating, -35°C to +50°C storage
MIFARE Plus S / X: -25°C to +70°C

Form Factor

iCLASS Seos: ISO/IEC 7810 card, 54mm x 85mm x 0.8mm, composite 60% PVC / 40% PET laminated
MIFARE Plus S / X: 8 inch wafer (120 µm thickness, FFC), MOA4 (PLLMC plastic leadless module carrier, SOT500-2)

Security

iCLASS Seos: Extended Privacy Support (Seos), Static UID optional (Seos), multiple logical records and data groups, HID Global SIO Data Object Support
MIFARE Plus S / X: AES-128 authentication and encryption, MIFARE CRYPTO1 keys (2×48-bit per sector), AES keys (2×128-bit per sector), originality signature, anti-tearing mechanism, Common Criteria…

Spec	iCLASS Seos	MIFARE Plus S / X
Frequency	13.56 MHz (Seos and iCLASS), 125 kHz (Prox)	13.56 MHz
Protocol	ISO/IEC 14443-A (Seos), ISO 15693 (iCLASS), ISO 11784/11785 (Prox)	ISO/IEC 14443 Type A, ISO/IEC 14443-4
Memory	8 KBytes (Seos), 2k bit or 32k bit (iCLASS), 512 bits (Prox)	2 kB or 4 kB EEPROM
Interface	RF (contactless)	RF (contactless)
Temp Range	-40°C to +70°C operating, -35°C to +50°C storage	-25°C to +70°C
Form Factor	ISO/IEC 7810 card, 54mm x 85mm x 0.8mm, composite 60% PVC / 40% PET laminated	8 inch wafer (120 µm thickness, FFC), MOA4 (PLLMC plastic leadless module carrier, SOT500-2)
Security	Extended Privacy Support (Seos), Static UID optional (Seos), multiple logical records and data groups, HID Global SIO Data Object Support	AES-128 authentication and encryption, MIFARE CRYPTO1 keys (2×48-bit per sector), AES keys (2×128-bit per sector), originality signature, anti-tearing mechanism, Common Criteria…

Verdict

Choose iCLASS Seos if you need multi-technology credential consolidation in enterprise physical access control deployments. This chip operates across three frequencies: 13.56 MHz for Seos secure identity objects with 8 KB memory, 13.56 MHz for legacy iCLASS using ISO 15693 with 2k or 32k bit memory, and 125 kHz for Prox compatibility with 512 bits following ISO 11784/11785. The Seos secure identity object layer supports Extended Privacy Support and optional static UID, enabling migration from legacy Prox and iCLASS systems without replacing existing readers. The architecture uses multiple logical records and data groups with HID Global SIO Data Object Support, making it ideal for organizations with heterogeneous reader infrastructure or phased upgrade requirements where backwards compatibility justifies the complexity. Choose MIFARE Plus S or X if you require standardized AES-128 cryptography with Common Criteria EAL4+ certification for secure access control or transit applications. Operating exclusively at 13.56 MHz following ISO/IEC 14443 Type A and ISO/IEC 14443-4 protocols, MIFARE Plus offers 2 KB or 4 KB EEPROM with dual-layer security: MIFARE CRYPTO1 keys (2×48-bit per sector) for legacy compatibility and AES keys (2×128-bit per sector) for modern deployments. The anti-tearing mechanism protects data integrity during interrupted write operations, while originality signatures prevent counterfeiting. The S and X variants provide flexibility in security level implementation. This chip suits greenfield deployments prioritizing cryptographic strength, global interoperability through ISO standards, and certified security assurance over multi-technology backwards compatibility.

FAQ

Can iCLASS Seos work with existing 125 kHz Prox readers?

Yes, iCLASS Seos credentials include 125 kHz Prox compatibility using ISO 11784/11785 with 512 bits of memory, allowing them to function with legacy Prox readers while also supporting newer 13.56 MHz Seos and iCLASS systems on the same card.

What is the memory difference between MIFARE Plus and iCLASS Seos?

MIFARE Plus offers 2 KB or 4 KB EEPROM, while iCLASS Seos provides 8 KB for the Seos application. However, total iCLASS Seos memory varies depending on configuration across its three technologies (2k-32k bit for iCLASS, 512 bits for Prox).

Does MIFARE Plus support both old and new security standards?

Yes, MIFARE Plus supports dual authentication layers: legacy MIFARE CRYPTO1 with 2×48-bit keys per sector for backwards compatibility, and modern AES-128 encryption with 2×128-bit keys per sector, allowing migration from MIFARE Classic while meeting current security requirements.

Sourcing iCLASS Seos or MIFARE Plus S / X in volume?

Roxtron builds custom RFID and NFC products around both iCLASS Seos and MIFARE Plus S / X. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.