24AA64T-E/OT

24AA64T-E/OT is Microchip’s 64-kilobit I2C serial EEPROM. It provides non-volatile storage for data that must survive power cycles, such as configuration data, calibration constants, or device IDs.
Key points:
- Size and organization: 64 Kbit memory (8,192 bytes), typically organized as 8K × 8.
- Interface: I2C two-wire. Device address allows memory banking (standard 7-bit addressing; supports both 100 kHz and 400 kHz modes).
- Access: Random and sequential read; 16-byte page write capability.
- Performance and endurance: Write cycle ~a few milliseconds; endurance around 1,000,000 write cycles; long data retention (on the order of decades).
- Power and temp: Operating voltage typically 1.7–5.5 V; extended/industrial temperature range (suffix E) for -40°C to +125°C; packaging options indicated by the OT variant.
- Applications: Configuration data storage, calibration tables, serial numbers, and other small non-volatile data in embedded systems.
- Packaging: 8-pin packages (e.g., SOIC, PDIP) with options for different temperature grades and packaging.
For exact voltage, timing, and package details, consult the datasheet.

Equivalent parts (64 Kbit I2C EEPROM, pin-compatible with 24AA64T-E/OT) from other vendors include:
- AT24C64A/D (Atmel/Microchip)
- M24C64-W (STMicroelectronics)
- CAT24C64 / CAT24C64B (ON Semiconductor)
- 24LC64 / 24C64 (Microchip legacy)
These share the same I2C interface, 1-byte addressing, and similar voltage ranges. Check package and timing to ensure compatibility.

Key features of 24AA64T-E/OT (64Kbit I2C EEPROM, automotive grade):
- 64Kbit serial EEPROM (8K × 8) with I2C two‑wire interface
- 16‑bit memory addressing (MSB/LSB) for full 8K data space
- Random and sequential read; page write up to 32 bytes
- Write cycle typically ~5 ms; acknowledge polling for completion
- WP pin for hardware write protection and A0–A2 pins for up to 8 devices on the bus
- Operating voltage in common I2C range (typical 1.8–5.5 V)
- Endurance: about 1,000,000 write cycles; data retention ~200 years
- Temperature: automotive grade, -40°C to +125°C (suffix OT)
- 8‑pin package; Tape & Reel packaging (-T) available; RoHS compliant
- Low standby current; suitable for power‑conscious applications
- ESD protection and general reliability features typical of Microchip I2C EEPROMS
Note: exact voltage range and timing can vary slightly by package/lot; refer to the datasheet for precise specs.

- Pin count: 8 pins (8‑pin package, e.g., SOIC/DIP).
- Pin functions (pin1–pin8, orientation may vary):
- A0, A1, A2: hardware address inputs
- GND: ground
- SDA: I2C data
- SCL: I2C clock
- WP: write protect (active high)
- VCC: supply voltage
- Function: 64‑Kbit I2C serial EEPROM (8K × 8), with 3 address pins to allow multiple devices on the same bus; WP protects memory when asserted.

- Manufacturer: Microchip Technology Inc.
- What kind of company: A U.S.-based semiconductor company that designs and manufactures embedded-control solutions, including microcontrollers, non-volatile memory (EEPROMs like the 24AA64), and analog ICs.

24AA64T-E/OT is a 64-kbit I2C serial EEPROM (8 KB) with extended temperature range. Typical applications include:
- Storing calibration, configuration, and parameter data for microcontrollers
- Saving device IDs, serial numbers, and factory/programming data
- Lookup tables, thresholds, and small firmware configuration data
- Non-volatile boot/configuration info and lightweight event logs
- Automotive/industrial equipment and other environments needing extended-temp operation
- IoT, consumer electronics, and medical devices for persistent settings and small data storage
- Any application requiring reliable, low-power, non-volatile storage across power cycles

8-pin SOIC (surface-mount) package.