iCLASS Seos vs MIFARE DESFire EV2

HID iCLASS Seos offers multi-technology credentials (13.56 MHz/125 kHz) with 8 KB Seos storage. DESFire EV2 provides EAL5+ certified security, up to 32 KB memory, and NFC compatibility at 13.56 MHz.

Side-by-side specs

Frequency

iCLASS Seos: 13.56 MHz (Seos and iCLASS), 125 kHz (Prox)
MIFARE DESFire EV2: 13.56 MHz

Protocol

iCLASS Seos: ISO/IEC 14443-A (Seos), ISO 15693 (iCLASS), ISO 11784/11785 (Prox)
MIFARE DESFire EV2: ISO/IEC 14443-A (all levels), ISO/IEC 14443-4, ISO/IEC 7816-4 (partial), NFC compatible

Memory

iCLASS Seos: 8 KBytes (Seos), 2k bit or 32k bit (iCLASS), 512 bits (Prox)
MIFARE DESFire EV2: 2 kB, 4 kB, 8 kB, 16 kB, or 32 kB EEPROM (data retention 25 years, 500,000 write cycles typical)

Interface

iCLASS Seos: RF (contactless)
MIFARE DESFire EV2: RF contactless (106, 212, 424, 848 kbit/s)

Temp Range

iCLASS Seos: -40°C to +70°C operating, -35°C to +50°C storage
MIFARE DESFire EV2: -25°C to +70°C ambient, -55°C to +125°C storage

Form Factor

iCLASS Seos: ISO/IEC 7810 card, 54mm x 85mm x 0.8mm, composite 60% PVC / 40% PET laminated
MIFARE DESFire EV2: FFC wafer (8-inch 75/120 µm or 12-inch 75/150 µm thickness), MOA4 module (SOT500-2), MOB6 module (SOT500-3); standard (17 pF) or high (70 pF) input capacitance variants

Security

iCLASS Seos: Extended Privacy Support (Seos), Static UID optional (Seos), multiple logical records and data groups, HID Global SIO Data Object Support
MIFARE DESFire EV2: Common Criteria EAL5+ certified; AES-128, 3DES (3KTDEA, 168-bit), 2KTDEA (112-bit), Single DES (56-bit); CMAC (8 bytes); mutual three-pass authentication; Random ID option; ECC…

Spec	iCLASS Seos	MIFARE DESFire EV2
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-A (all levels), ISO/IEC 14443-4, ISO/IEC 7816-4 (partial), NFC compatible
Memory	8 KBytes (Seos), 2k bit or 32k bit (iCLASS), 512 bits (Prox)	2 kB, 4 kB, 8 kB, 16 kB, or 32 kB EEPROM (data retention 25 years, 500,000 write cycles typical)
Interface	RF (contactless)	RF contactless (106, 212, 424, 848 kbit/s)
Temp Range	-40°C to +70°C operating, -35°C to +50°C storage	-25°C to +70°C ambient, -55°C to +125°C storage
Form Factor	ISO/IEC 7810 card, 54mm x 85mm x 0.8mm, composite 60% PVC / 40% PET laminated	FFC wafer (8-inch 75/120 µm or 12-inch 75/150 µm thickness), MOA4 module (SOT500-2), MOB6 module (SOT500-3); standard (17 pF) or high (70 pF) input capacitance variants
Security	Extended Privacy Support (Seos), Static UID optional (Seos), multiple logical records and data groups, HID Global SIO Data Object Support	Common Criteria EAL5+ certified; AES-128, 3DES (3KTDEA, 168-bit), 2KTDEA (112-bit), Single DES (56-bit); CMAC (8 bytes); mutual three-pass authentication; Random ID option; ECC…

Verdict

Choose iCLASS Seos if you need backward compatibility with existing legacy access control infrastructure or multi-technology credential deployment. The Seos variant operates at 13.56 MHz using ISO/IEC 14443-A with 8 KBytes of memory, while the same credential can simultaneously support 125 kHz Prox (512 bits, ISO 11784/11785) and ISO 15693 iCLASS (2k or 32k bit) on a single card. This makes it ideal for phased migration projects where you must maintain operational legacy readers while deploying newer secure systems. Seos offers Extended Privacy Support and optional Static UID, with data organized in logical records and data groups using HID Global's proprietary SIO (Secure Identity Object) architecture. However, the security implementation is vendor-specific to HID Global's ecosystem, limiting interoperability with non-HID systems. Choose MIFARE DESFire EV2 if you require independently certified security, open-standard interoperability, or NFC integration. DESFire EV2 operates exclusively at 13.56 MHz conforming to ISO/IEC 14443-A (all four levels), ISO/IEC 14443-4, and partial ISO/IEC 7816-4, with Common Criteria EAL5+ certification. Memory options range from 2 KB to 32 KB EEPROM with 25-year data retention and 500,000 write cycles. Security features include AES-128, 3DES, and 2KTDEA encryption, mutual three-pass authentication, transaction MAC for tamper detection, proximity check against relay attacks, Random ID for privacy, and hardware exception sensors. Communication speeds reach 848 kbit/s across four speed grades (106, 212, 424, 848 kbit/s). DESFire EV2 is vendor-neutral and widely supported across global access control, transportation ticketing, and secure identity applications requiring auditable cryptographic security.

FAQ

Can iCLASS Seos credentials work with legacy 125 kHz proximity readers?

Yes, iCLASS Seos multi-technology credentials include a 125 kHz Prox component (512 bits, ISO 11784/11785) that operates with existing low-frequency proximity readers, enabling gradual migration to 13.56 MHz Seos technology without replacing all infrastructure simultaneously.

What security certification does MIFARE DESFire EV2 have compared to iCLASS Seos?

MIFARE DESFire EV2 holds Common Criteria EAL5+ certification with independently verified AES-128, 3DES, and transaction MAC security features. iCLASS Seos uses HID Global's proprietary Secure Identity Object architecture with Extended Privacy Support but does not specify equivalent independent security certifications in available documentation.

Which chip offers larger memory capacity for multi-application deployments?

MIFARE DESFire EV2 offers up to 32 KB EEPROM across five memory variants (2, 4, 8, 16, 32 KB), significantly exceeding iCLASS Seos' 8 KBytes of Seos memory, making DESFire EV2 better suited for storing multiple applications, cryptographic keys, and large datasets on a single credential.

Sourcing iCLASS Seos or MIFARE DESFire EV2 in volume?

Roxtron builds custom RFID and NFC products around both iCLASS Seos and MIFARE DESFire EV2. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.