24LC08BT-I/OT Overview

The 24LC08BT-I/OT is an 8 Kbit serial EEPROM from Microchip Technology. It uses an I²C (two-wire) interface. The memory is organized into four blocks, each with 256 × 8 bits, which makes addressing and memory management simple.

In terms of electrical features, the 24LC08BT-I/OT supports a wide operating voltage range from 2.5 V to 5.5 V. This allows it to work easily with many microcontrollers and low-power systems. The device has very low standby current in the microamp range and active current in the milliamp range, helping reduce total system power use. It also supports page write operations of up to 16 bytes, which improves write speed while keeping data reliable.

For applications, the 24LC08BT-I/OT is commonly used for device parameter storage, calibration data, configuration settings, and serial number storage. It is widely used in consumer electronics, industrial control systems, medical devices, and IoT products.

24LC08BT-I/OT Key Specs

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24LC08BT-I/OT Pinout

The 24LC08BT-I/OT EEPROM in the SOT-23 package has a simple 5-pin configuration.

SCL (Serial Clock): This pin is used to provide the clock signal for the I²C interface. It synchronizes data transfer between the EEPROM and the microcontroller.

VSS (Ground): This is the ground reference for the device and should be connected to the system ground.

SDA (Serial Data): The data line for I²C communication. It carries the read and write data between the EEPROM and the controller.

VCC (Supply Voltage): This pin provides the power for the EEPROM and supports a wide voltage range, typically 2.5 V to 5.5 V.

WP (Write Protect): This pin controls write protection. When pulled high, the memory is protected against write operations. When low, writing is allowed.

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24LC08BT-I/OT Features

• Single Supply with Operation down to 1.7V for 24AA08 and 24FC08 Devices, 2.5V for 24LC08B Devices

• Low-Power CMOS Technology:

- Read current 1 mA, maximum

- Standby current 1 µA, maximum (I-temp.)

• 2-Wire Serial Interface, I2C Compatible

• Schmitt Trigger Inputs for Noise Suppression

• Output Slope Control to Eliminate Ground Bounce

• 100 kHz, 400 kHz and 1 MHz Compatibility

• Page Write Time: 5 ms, Maximum

• Self-Timed Erase/Write Cycle

• 16-Byte Page Write Buffer

• Hardware Write-Protect

• ESD Protection >4,000V

• More than 1 Million Erase/Write Cycles

• Data Retention >200 Years

• Factory Programming Available

• RoHS Compliant

• Temperature Ranges:

- Industrial (I): -40°C to +85°C

- Extended (E): -40°C to +125°C

• Automotive AEC-Q100 Qualified

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24LC08BT-I/OT Block Diagram

This block diagram of the 24LC08BT-I/OT can be easily understood from two perspectives: data transfer and core memory storage.

1. Data Input and Control Logic

This part acts as the chip’s “brain” and “external window.” The SDA and SCL pins communicate with the external host through the I/O Control Logic. When a command is received, the Memory Control Logic determines whether to read or write data. The WP pin at the top of the diagram functions like a physical lock, preventing accidental data modification when enabled. The HV Generator is a specialized tool for the memory, generating the high voltage needed to program or erase data in the non-volatile storage medium.

2. Addressing and Memory Array

The EEPROM Array is the core area where data is stored. To locate a specific data point, the control logic sends instructions to the XDEC and YDEC, which act like coordinates to precisely select a location in the array. Before data enters or leaves the array, it is temporarily stored in the Page Latches. Then, the Sense Amplifier and R/W Control at the bottom amplifies the signals, ensuring that even weak signals can be read or written accurately.

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24LC08BT-I/OT Application Fields

1. Consumer Electronics

The 24LC08BT-I/OT is mainly used to store user settings. For example, in smart TVs or monitors, it saves brightness, contrast, volume levels, and preset channel lists.

2. Telecommunications

It is used in routers, switches, or optical modules. It stores fixed data like MAC addresses, device serial numbers, and vendor IDs. It also keeps specific port configurations and firmware update flags.

3. Automotive Electronics

Thanks to its industrial-grade stability, it is used in dashboards or in-car infotainment systems. It stores key driving data, initial sensor calibration values, and fault codes (DTC) for safety systems like airbags.

4. Industrial Control & Automation

In PLCs and various industrial sensors, it stores calibration curves and range parameters after on-site setup. It can also record total operation time or error codes from abnormal shutdowns.

5. PC & Peripherals

This chip is widely used in printer cartridges, graphics cards, and docking stations. In printer cartridges, it stores the remaining ink level and serial number to prevent counterfeiting. In graphics cards, it reports key hardware information such as memory frequency and timing to the system through the SPD function.

6. Smart Home & IoT

In smart plugs, thermostats, or cameras, it stores connection credentials. It keeps Wi-Fi SSID and passwords, unique cloud authentication keys, and user-set automation schedules.

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24LC08BT-I/OT Package

The 24LC08BT-I/OT uses a SOT-23 (5-Lead) package design. While it provides high-performance storage, it is also very small. This saves a lot of space on the circuit board. Because of its tiny size, it can easily fit into portable devices and high-density electronic modules.

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