Microchip Technology 24AA025-I/ST

Overview

24AA025-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 industrial temperature range (−40°C to +85°C), 400 kHz max clock, and 16-byte page write buffer. It supports up to eight devices on one bus and is used for storing calibration data, configuration settings, or device identifiers in embedded control systems.

For engineers reviewing the 24AA025-I/ST datasheet, 24AA025-I/ST pinout, 24AA025-I/ST application, or 24AA025-I/ST equivalent, key selection considerations include its 6-lead SOT-23 package, absence of hardware write-protect (WP pin not connected), Schmitt-trigger noise immunity, and compatibility with low-voltage microcontroller I²C interfaces.

Technical Context

The 24AA025-I/ST implements a standard two-wire I²C slave interface with open-drain SDA/SCL pins requiring external pull-ups. Its internal address pointer auto-increments during sequential reads and wraps at 0xFF, enabling full memory access in one transaction.

It uses low-power CMOS technology with typical standby current of 1 μA and active read current of 1 mA. Write operations are self-timed (≤5 ms), support byte and page modes, and include built-in VCC threshold detection to inhibit writes below 1.5V.

Key Specifications

Pinout & Package

24AA025-I/ST is housed in a 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for high-density PCB layouts. Pin A2 is not internally connected per datasheet Section 2.3 and Figure 5-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA025-I/ST, the 24LC025-I/ST offers wider temperature tolerance but tighter VCC constraints, while the AT24C02-SSHM-T provides write protection at the cost of larger size and incompatible pinout - making 24AA025-I/ST optimal for compact, low-voltage, write-flexible designs.

Availability

24AA025-I/ST is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, and medical diagnostic handsets requiring stable component supply across multi-year production cycles.

Supply support for 24AA025-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 nonvolatile memory solutions, headquartered in Chandler, Arizona.

The 24AA025-I/ST belongs to Microchip's 24XX025 family of serial EEPROMs, designed specifically for reliable, low-power, space-efficient data storage in resource-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by the 24AA025-I/ST?

The 24AA025-I/ST supports up to 400 kHz I²C clock frequency when VCC is ≥1.8V. At VCC < 1.8V, maximum clock rate is limited to 100 kHz per DS21210N-page 3, Table 1-2. This dual-speed capability ensures interoperability across diverse host platforms while maintaining timing compliance.

Does the 24AA025-I/ST have a hardware write-protect pin?

No, the 24AA025-I/ST does not include a functional WP pin. As confirmed in DS21210N-page 5, Section 2.4 and the Device Selection Table, the WP pin is not internally connected on any 24XX025 variant. Write protection must be implemented in software or via external logic if required.

How many 24AA025-I/ST devices can be connected on the same I²C bus?

Up to four 24AA025-I/ST devices can share one I²C bus. Because the SOT-23 package lacks the A2 pin (DS21210N-page 5), only A1 and A0 are available for chip addressing, yielding 2² = 4 unique I²C addresses (0x50–0x53) per DS21210N-page 7, Section 5.1.

What is the page write size and maximum write time for the 24AA025-I/ST?

The 24AA025-I/ST features a 16-byte page write buffer and guarantees a maximum write cycle time of 5 ms for both byte and page operations (DS21210N-page 3, Parameter TWC). This allows efficient bulk parameter updates without exceeding timing budgets in real-time systems.

Is the 24AA025-I/ST RoHS compliant and lead-free?

Yes, the 24AA025-I/ST is Pb-free and RoHS compliant per DS21210N-page 1, Features section. The "I/ST" suffix denotes industrial temperature grade in SOT-23 package with matte tin (Sn) plating, meeting JEDEC J-STD-609A Class 1 requirements.