Atmel AT24C256C Memory Smart Card 256K Bits

Atmel AT24C256C Memory Smart Card 256K Bits


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The Atmel AT24C256C straight memory chip card is a 256Kb Serial EEPROM utilizing an I²C (2-wire) serial interface. The smart card chip is organized as one block of 32K x 8 and is optimized for use in consumer, industrial, and automotive applications where low-cost, low-power and low-voltage operation are essential.. The EEPROM is available in a variety of space-saving packaging options.

The Atmel AT24C256C smart card chip provides 262,144-bits of Serial Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 32,768 words of 8 bits each. The chip operates from 1.7V to 5.5V.

Program the AT24C256C Memory Cards with CardLogix’ Smart Toolz™ development kit featuring the user-friendly Card Configuration Utility (CCU), Winplex™ API, and CardAppz™ application software, cards and readers.

The AT24C256C Atmel chip card is available in PVC, ABS, PET, Composite, and Polycarbonate ISO 7810, CR-80, SAM/SIM card, and Keychain form factors.

The Atmel AT24C256C straight memory chip card is now owned by Microchip.


  • Low-voltage and Standard-voltage Operation
    •  VCC = 1.7V to 5.5V
  • Internally Organized as 32,768 x 8
  • 2-wire Serial Interface
  • Schmitt Trigger, Filtered Inputs for Noise Suppression
  • Bidirectional Data Transfer Protocol
  • 400kHz (1.7V) and 1MHz (2.5V, 2.7V, 5.0V) Compatibility
  • Write Protect Pin for Hardware Protection
  • 64-byte Page Write Mode
    • Partial Page Writes Allowed
  • Self-timed Write Cycle (5ms Max)
  • High Reliability
    • Endurance: 1,000,000 Write Cycles
    • Data Retention: 40 Years
  • Lead-free/Halogen-free Devices Available
  • Green Package Options (Pb/Halide-free/RoHS Compliant)
    • 8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 8-ball VFBGA
  • Die Sale Options: Wafer Form, Waffle Pack, and Bumped Wafers


Atmel Corporation is a worldwide leader in the design and manufacture of microcontrollers, capacitive touch solutions, advanced logic, mixed-signal, nonvolatile memory and radio frequency (RF) components. Leveraging one of the industry’s broadest intellectual property (IP) technology portfolios, Atmel® provides the electronics industry with complete system solutions focused on industrial, consumer, security, communications, computing and automotive markets.

Atmel Corporation 1600 Technology Drive, San Jose, CA 95110