Microchip Technology 24LC00-I/ST

Overview

24LC00-I/ST from Microchip Technology Inc. is a 128-bit (16 × 8) I²C-compatible serial EEPROM designed for low-power, space-constrained applications requiring nonvolatile storage of calibration data, device IDs, or manufacturing parameters. It operates from 2.5V to 5.5V, draws only 500 µA typical read current and 100 nA standby current, and supports 100 kHz / 400 kHz clock rates in industrial temperature range (–40°C to +85°C). Packaged in 8-lead SOIC, it integrates Schmitt-trigger inputs and slope-controlled outputs for robust noise immunity on shared buses.

For engineers reviewing the 24LC00-I/ST datasheet, 24LC00-I/ST pinout, 24LC00-I/ST application, or 24LC00-I/ST equivalent, this page delivers verified electrical specs, validated SOIC-8 pin mapping, confirmed I²C timing compliance (THIGH/TLOW/TSU:STA), endurance (1M cycles), and real-world use cases in embedded sensor nodes, power supply configuration, and industrial control firmware storage.

Technical Context

The 24LC00-I/ST implements a slave-only I²C interface with fixed 4-bit device code '1010' and three don't-care address bits, enabling up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and retains position after byte writes.

It uses on-chip charge-pump voltage generation for EEPROM programming, includes VCC threshold detection (disabled below 2.5V), and relies on ACK polling-not timeout-based delay-to confirm write completion. All I/O pins feature Schmitt-trigger inputs and input filter spike suppression (TSP ≤ 50 ns) for reliable operation in electrically noisy environments.

Key Specifications

Pinout & Package

24LC00-I/ST is supplied in an 8-lead SOIC package (3.90 mm body width), RoHS-compliant and Pb-free. Pin 1 is marked with a notch or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24AA00-I/ST, the 24LC00-I/ST trades 1.8V operation for improved noise immunity at higher VCC; versus AT24C01A-PU, it provides pin-compatible minimal footprint but lacks scalability-making it optimal for cost-sensitive, space-constrained 128-bit storage tasks.

Availability

24LC00-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and embedded controller bootloader ID storage requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for 24LC00-I/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.

The 24LC00 belongs to Microchip's legacy 24XX00 family of ultra-low-power serial EEPROMs, engineered specifically for minimal-footprint, low-quiescent-current nonvolatile storage in resource-constrained embedded systems.

FAQ

What is the minimum operating voltage for the 24LC00-I/ST?

The 24LC00-I/ST requires a minimum supply voltage of 2.5V, as specified in the Device Selection Table and Electrical Characteristics section. Unlike the 24AA00 variant, it does not support operation down to 1.8V. This 2.5V lower limit ensures stable internal charge-pump operation for EEPROM writes and reliable I²C communication across the industrial temperature range. Operating below 2.5V may result in failed writes or communication errors.

Does the 24LC00-I/ST support 400 kHz I²C communication?

Yes, the 24LC00-I/ST fully supports 400 kHz I²C clock frequency under VCC ≥ 2.5V, as confirmed in Table 1-2 AC Characteristics. Its THIGH and TLOW timing parameters meet Fast-mode requirements, and its SDA/SCL rise/fall times (≤300 ns) comply with I²C specification limits. No external speed-binning or derating is required-designers can enable 400 kHz mode directly in host controller firmware.

How many write cycles can the 24LC00-I/ST endure?

The 24LC00-I/ST is rated for more than 1 million erase/write cycles, per the Features section and Table 1-2. This endurance is ensured by characterization-not 100% tested-and applies across the full industrial temperature range. In practice, this supports daily reprogramming for over 27 years, making it suitable for applications involving periodic calibration updates or firmware metadata logging.

Is the 24LC00-I/ST pin-compatible with other 24XX00 family members in SOIC-8?

Yes, the 24LC00-I/ST shares identical SOIC-8 pinout and function mapping with 24AA00-I/ST and 24C00-I/ST, including NC pins at positions 1, 2, 3, and 7, VSS at pin 4, SDA at pin 5, SCL at pin 6, and VCC at pin 8. This allows direct substitution within the same package variant, provided the application's VCC range and temperature requirements align with the selected variant's specifications.

What is the purpose of ACK polling with the 24LC00-I/ST?

ACK polling allows the master controller to detect write completion without fixed delays: after issuing a STOP condition, the master repeatedly sends a START + write-address byte; the 24LC00-I/ST responds with an ACK only once its internal 3 ms write cycle finishes. This method maximizes I²C bus utilization and eliminates worst-case timing uncertainty-critical for real-time systems where deterministic response latency matters. The 24LC00-I/ST does not generate ACKs during active writes, making this mechanism both reliable and efficient.