| M34F04 | 4 Kbit Serial I2C EEPROM With Hardware Write Control on Top Half of Memory | Active | 0.4 | 1 | I2C | 4 | 2.5 | SO8 | Half Array Write Protect |
| M34E04 | 4 Kbit I2C bus / SMBus Serial EEPROM, SPD for DRAM Modules (DDR4) | Active | 0.4 | 4 | I2C | 4 | 1.7 | UFDFPN8 | Data lock by block of 128 bytes |
| M34E02-F | 2 Kbit I2C bus Serial EEPROM, SPD for DRAM modules (DDR2/DDR3) | Active | 0.4 | 1 | I2C | 2 | 1.7 | TSSOP8,UFDFPN8 | Data lock for lower 128 byte block |
| M34E04B | 4-Kbit Serial Presence Detect (SPD) EEPROM compatible with JEDEC EE1004 | Active | 0.4 | 4 | I2C | 4 | 1.7 | UFDFPN8 | Data lock for lower 128 byte block |
