The M24C32-U is a 32-Kbit I²C-compatible EEPROM (electrically erasable programmable memory) organized as 4 K × 8 bits. It can operate with a supply voltage of 1.7 V to 5.5 V, over an ambient temperature range from -40 °C to +85 °C.

The device offers an additional page, named the identification page (32 bytes). This page stores a 128‑bit (16 bytes) unique factory-programmed serial number, which is frozen in read-only mode on delivery from the factory.

The uniqueness of the serial number is ensured across the whole portfolio of serial EEPROMs manufactured by STMicroelectronics, offering a unique identifier.

• I²C interface
  • Compatible with the following I²C bus modes:
    • 100 kHz (Standard-mode)
    • 400 kHz (Fast-mode)
    • 1 MHz (Fast-mode Plus)
• Memory
  • 32-Kbit (4-Kbyte) of EEPROM
  • Page size: 32-byte
• Identification page
  • 256-bit (32-byte) locked in read-only on delivery from the factory
• UID
  • 128-bit (16-byte) unique factory-programmed serial number
• Supply voltage
  • Wide voltage range: 1.7 V to 5.5 V
• Temperature
  • Operating temperature range: -40 °C to +85 °C
• Fast write cycle time
  • Byte and page write within 5 ms (typically 3.2 ms)
• Performance
  • Enhanced ESD and latch-up protection
  • ESD protection: 4 kV (HBM)
  • More than 4 million write cycles
  • More than 200-year data retention
• Advanced features
  • Random and sequential read modes
  • Hardware write protection of the whole memory array
• Package
  • SO8N (ECOPACK2 compliant)