CAT24C128YI-GT3

CAT24C128YI-GT3 is a 128-kilobit serial I2C EEPROM (16 KB) from the CAT24C family. It provides non-volatile storage accessible over the I2C two-wire bus. Key features: 7-bit device address with A0–A2 pins, a 16-bit memory address space (0x0000–0x3FFF), standard/fast I2C speeds, a page write capability, and a write-cycle time of a few milliseconds. It includes a WP (write protect) input to guard memory and operates from about 1.8–5.5 V (industrial variants exist). Applications include data logging, configuration storage, calibration tables, and embedded parameters. The GT3 suffix indicates a specific packaging/revision (lead-free RoHS compliant); refer to the datasheet for exact package type, temperature range, current limits, and timing. For integration, use proper pull-ups on SCL/SDA, tie WP to ground for writable operation, and use A0–A2 to address multiple devices on the same I2C bus.

Equivalent 128-kbit I2C serial EEPROMs from other vendors include:
- Microchip: 24AA128A, 24LC128A, 24C128A
- Atmel/Microchip: AT24C128A
- ST: M24C128-W
- Xicor: X24C128
Any 128Kb I2C EEPROM with the same interface and voltage range can substitute, provided the package/pinout matches.

Here are the typical features of CAT24C128YI-GT3:
- I2C 2-wire serial EEPROM
- 128 Kbit organization (16 Kbytes)
- 16-byte page write; supports sequential read/writes
- Two-byte memory address field for addressing (0x0000–0x3FFF)
- I2C speeds: Standard mode up to 100 kHz; Fast mode up to 400 kHz
- Write-protect (WP) input
- Endurance: ~1,000,000 write cycles; Data retention ~100 years
- Operating voltage: 1.7 V to 5.5 V
- Temperature range: Industrial grade (-40°C to +125°C)
- 8-pin package (Pb-free, GT3 variant; available in common SMD footprints)
Note: Always confirm exact voltage, temperature range, and package options from the latest datasheet for this specific lot.

- Pin count: 8 pins (8‑lead package such as SOIC/SOP)
- Function: 128 Kbit I2C serial EEPROM (nonvolatile memory, 16 KB organization) with I2C interface. Includes address inputs A0–A2 for device addressing and a WP pin for write protection; pins include Vcc, GND, SDA, and SCL.

Manufacturer: ON Semiconductor (the CAT24C128YI-GT3 line originated with Catalyst Semiconductor and was later acquired by ON Semiconductor).
Company type: A global American semiconductor company that designs, manufactures, and sells integrated circuits and discrete components for automotive, industrial, consumer, and networking applications.

CAT24C128YI-GT3 is a 128‑kbit I2C EEPROM intended for non‑volatile storage. Common application areas include:
- Embedded systems/microcontrollers: parameters, calibration data, LUTs, user preferences
- Automotive ECUs: calibration/config memory, fault/event logs
- Industrial controls/instrumentation: data logging, setup memory, counters
- Consumer electronics: boot/config data, device IDs, firmware metadata
- IoT/wearables/smart meters: persistent configuration and sensor/event data
- Medical devices: calibration/config data and non‑volatile logs
- Any application needing small, cost‑effective non‑volatile memory with I2C.

8-pin surface-mount package (SOIC-8). RoHS-compliant (lead-free).