Microchip Technology AT24MAC402/602 I2C Compatible Series EEPROMs

Microchip AT24MAC402/602 I2C Compatible Series EEPROMs provide 2048 bits of Serial Electrically-Erasable Programmable Read-Only Memory (EEPROM) organized as 256 words of eight bits each and is accessed via an I2C-compatible (2-wire) serial interface. In addition, AT24MAC402/602 incorporates an easy and inexpensive method to obtain a globally unique MAC or EUI address (EUI-48 or EUI-64). AT24MAC402 is an EUI-48 compatible device with a 48-bit EUI address, and AT24MAC602 is an EUI-64 compatible device with a 64-bit EUI address. The EUI-48 and EUI-64 addresses can be assigned as the actual physical address of a system hardware device or node, or they can be assigned to a software instance. These addresses are factory programmed by Microchip and permanently write-protected in an extended memory block outside the standard 2-Kbit bit memory array. In addition, the AT24MAC402/602 provides the value-added feature of a factory-programmed, guaranteed unique 128-bit serial number located in the extended memory block (same area as the EUI address values). The serial number is Microchip factory-programmed and permanently write-protected. This 128-bit serial number is compatible with all AT24CS, AT93CS, and AT25S family serial numbers, providing guaranteed unique serial numbers for any application that uses Microchip Serial EEPROMs.


  • Low-voltage operation
  • 1.7V minimum (VCC = 1.7V to 5.5V)
  • Internally organized as 256 x 8 (2K)
  • I2C-compatible (2-wire) serial interface
  • Schmitt Trigger, filtered inputs for noise suppression
  • Bi-directional data transfer protocol
  • 400kHz (1.7V) and 1MHz (2.5V, 5.0V) compatibility
  • Write Protect pin for hardware data protection of the entire array
  • Permanent and Reversible Software Write Protection for the first half of the array
  • Software procedure to verify write-protect status
  • 16-byte page write modes
  • Partial page writes allowed
  • Self-timed write cycle (5ms max)
  • High-reliability
  • 1,000,000 write cycles
  • 100 years of data retention
  • Green package options (PB/Halide-free/RoHS compliant)
  • 8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 5-lead SOT23

Block Diagram

Block Diagram - Microchip Technology AT24MAC402/602 I2C Compatible Series EEPROMs
Published: 2019-09-12 | Updated: 2023-06-06