STMicroelectronics M24512-RDW6TP, 512kbit EEPROM Memory, 900ns 8-Pin TSSOP Serial-I2C

The M24512-W can operate with a supply voltage from 2.5 V to 5.5 V, the M24512-R can operate with a supply voltage from 1.8 V to 5.5 V and the M24512-DF can operate with a supply voltage from 1.7 V to 5.5 V. All these devices operate with a clock frequency of 1 MHz (or less) over an ambient temperature range of -40 °C / +85 °C.
The M24512-D offers an additional page, named the Identification Page (128 byte). The Identification Page can be used to store sensitive application parameters which can be (later) permanently locked in Read-only mode.

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