Microchip Technology 24LC024-I/STG

Overview

24LC024-I/STG from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 2.5V to 5.5V with hardware write-protection (WP pin), 16-byte page write buffer, and industrial temperature range (–40°C to +85°C). It supports up to 400 kHz clock rate, features Schmitt-trigger inputs for noise immunity, and is used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24LC024-I/STG datasheet, 24LC024-I/STG pinout, 24LC024-I/STG application, or 24LC024-I/STG equivalent, key selection considerations include VCC voltage compliance (2.5–5.5V), WP-enabled hardware protection, 8-pin SOIC package footprint, and compatibility with standard I²C master controllers requiring 100/400 kHz timing and open-drain SDA/SCL drive.

Technical Context

The 24LC024-I/STG implements a two-wire I²C interface with slave address decoding via A0–A2 pins, supporting up to eight devices on one bus. Its internal architecture includes a 16-byte page write buffer, self-timed erase/write cycle, and voltage threshold detector disabling write logic below 1.5V.

Schmitt-trigger inputs on SCL/SDA and input filtering suppress noise spikes; output slope control minimizes ground bounce. Write protection is enforced by the dedicated WP pin tied to VCC (enabled) or VSS (disabled), and the device uses an internal address pointer that auto-increments during sequential reads and rolls over at 0xFF.

Key Specifications

Pinout & Package

24LC024-I/STG is packaged in an 8-lead SOIC (3.90 mm) with gull-wing leads, RoHS-compliant matte tin finish, and standard JEDEC MS-012AC outline. Pin 1 is marked by laser dot; package body dimensions: 4.90 mm × 3.90 mm × 1.75 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024-I/STG, 24AA024-I/STG offers broader supply flexibility but sacrifices hardware write-protection, while AT24C02D-SSHM-T trades WP functionality and endurance for lower unit cost and alternate address space - making 24LC024-I/STG optimal for industrial systems demanding guaranteed write-locking and long-term reliability.

Availability

24LC024-I/STG is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration backup, and medical device usage logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24LC024-I/STG 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200 for automotive-grade parts.

The 24LC024-I/STG belongs to Microchip's legacy 24XX serial EEPROM family, designed specifically for reliable, low-power nonvolatile data storage in industrial and automotive control systems where hardware write-protection and extended temperature operation are essential.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24LC024-I/STG?

The 24LC024-I/STG requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Operation below 2.5V is not specified and may result in undefined behavior, including failure to acknowledge I²C commands or incomplete write cycles. The internal voltage detector disables write logic below approximately 1.5V, but read functionality is also unsupported below 2.5V per datasheet DS21210N.

Does the 24LC024-I/STG support 400 kHz I²C Fast-mode communication?

Yes, the 24LC024-I/STG fully supports 400 kHz I²C Fast-mode operation when VCC is ≥1.8V. Its AC specifications (THIGH, TLOW, TR, TF) are validated for this speed, and the device responds to standard I²C Start/Stop conditions and ACK protocols at 400 kHz. External pull-up resistors should be sized accordingly (e.g., ~2 kΩ for 5V bus) to meet rise-time requirements.

How does the WP pin on the 24LC024-I/STG affect memory access?

The WP (Write-Protect) pin on the 24LC024-I/STG is an active-high hardware lock: when tied to VCC, it prevents all write operations (byte, page, or erase) to the entire 2 Kbit memory array, though reads remain fully functional. When tied to VSS, full read/write access is enabled. This pin operates independently of software commands and cannot be overridden by I²C traffic - a key safeguard against firmware bugs or malware-induced corruption.

What is the maximum number of 24LC024-I/STG devices that can be connected on a single I²C bus?

Up to eight 24LC024-I/STG devices can be cascaded on one I²C bus using unique combinations of the A0, A1, and A2 address pins. Each device's 3-bit chip select forms the LSBs of the 7-bit slave address (1010A2A1A0), yielding eight distinct addresses (0x50–0x57). All devices share the same SDA and SCL lines, enabling up to 16 Kbits of contiguous EEPROM space when addressed sequentially in software.

Is the 24LC024-I/STG pin-compatible with other members of the 24XX024 family, such as the 24AA024-I/STG?

Yes, the 24LC024-I/STG is pin-compatible with the 24AA024-I/STG in the same SOIC-8 package: all eight pins (A0–A2, VSS, SDA, SCL, WP, VCC) occupy identical positions and perform identical functions. However, the 24AA024-I/STG operates down to 1.7V and lacks WP functionality in SOT-23 variants - so direct substitution is valid only in SOIC-8 designs where 2.5V minimum VCC is acceptable and hardware write-protection is required.