Microchip Technology 24AA024-I/ST

Overview

24AA024-I/ST from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.7V to 5.5V with hardware write-protection via the WP pin, 400 kHz max clock (100 kHz below 2.5V), and industrial temperature range (–40°C to +85°C). It supports up to eight devices on one bus and delivers 1 μA standby current and 1 mA typical read current for low-power embedded systems.

For engineers reviewing the 24AA024-I/ST datasheet, 24AA024-I/ST pinout, 24AA024-I/ST application, or 24AA024-I/ST equivalent, key selection considerations include its 16-byte page write buffer, Schmitt-trigger I²C inputs for noise immunity, self-timed 5 ms write cycle, hardware write-protect capability, and compatibility with standard 8-pin SOIC (3.90 mm) packaging.

Technical Context

The 24AA024-I/ST implements a two-wire I²C interface with open-drain SDA/SCL pins requiring external pull-ups, and uses address pins A0–A2 to configure its 7-bit slave address (1010xxx). Its internal address pointer auto-increments during sequential reads and wraps at 0xFF, enabling full-array access in one transaction.

Hardware write protection is enabled when the WP pin is tied to V_CC, locking the entire 256-byte array; WP is not internally connected on non-24XX024 variants. The device features Schmitt-trigger inputs and input filtering (50 ns spike suppression), plus a V_CC threshold detector disabling writes below ~1.5V to prevent data corruption during brown-out conditions.

Key Specifications

Pinout & Package

24AA024-I/ST is supplied in an 8-pin SOIC package (3.90 mm body width, JEDEC MS-012 variant), with lead finish Pb-free and RoHS compliant. Pin 1 is marked by laser indentation per Microchip specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC024-I/ST, the 24AA024-I/ST enables lower-voltage operation and simpler hardware protection, while AT24C02D-SSHM-T trades pin-based WP for flexible software lock bits - making 24AA024-I/ST optimal for robust, low-power, safety-critical storage where hardware-enforced write-lock is mandatory.

Availability

24AA024-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart meter firmware metadata requiring stable component supply, long-term data retention, and hardware write protection.

Supply support for 24AA024-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, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA024-I/ST belongs to Microchip's 24XX serial EEPROM product line, engineered for reliable, low-power nonvolatile storage in cost-sensitive, space-constrained embedded systems across industrial, medical, and consumer applications.

FAQ

What is the maximum I²C clock frequency supported by the 24AA024-I/ST?

The 24AA024-I/ST supports up to 400 kHz I²C clock frequency when V_CC is ≥2.5V. Below 2.5V (down to 1.7V), the maximum clock rate is reduced to 100 kHz to ensure reliable signal integrity and timing margin. This dual-speed capability allows seamless integration across both 3.3V/5V and ultra-low-voltage 1.8V systems without redesign.

Does the 24AA024-I/ST have hardware write protection, and how is it implemented?

Yes, the 24AA024-I/ST includes a dedicated hardware write-protect (WP) pin. When WP is tied to V_CC, the entire 256-byte memory array is locked against write operations - including byte and page writes - regardless of I²C command. This protection remains active even during power transitions, providing fail-safe data integrity. The WP pin is not present on 24AA025 or SOT-23 variants.

What package type is used for the 24AA024-I/ST, and what are its key mechanical dimensions?

The 24AA024-I/ST is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 3.90 mm body width (JEDEC MS-012), 1.27 mm lead pitch, and Pb-free/RoHS-compliant matte tin plating. Pin 1 is laser-marked for orientation. This industry-standard package enables automated assembly and offers proven thermal and mechanical reliability in reflow-soldered industrial PCBs.

How many devices can be connected on the same I²C bus using the 24AA024-I/ST?

Up to eight 24AA024-I/ST devices can be cascaded on a single I²C bus using the three hardware address pins (A0, A1, A2), which configure the three LSBs of the 7-bit slave address (1010xxx). Each device must have a unique A0–A2 combination; all pins must be hardwired to either V_SS or V_CC. This enables up to 16 Kbit of contiguous EEPROM space with proper software address mapping.

What is the write endurance and data retention specification for the 24AA024-I/ST?

The 24AA024-I/ST guarantees a minimum of 1 million erase/write cycles per memory location and 200 years of data retention at +25°C ambient temperature. These specifications are validated per Microchip's characterization process and apply across the full industrial temperature range (–40°C to +85°C), ensuring long-term reliability in demanding embedded deployments where field replacement is impractical.