Microchip Technology 24AA025-I/MS

Overview

24AA025-I/MS 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 frequency, and 16-byte page write buffer. It serves as nonvolatile configuration storage in embedded controllers, sensor nodes, and power management ICs.

For engineers reviewing the 24AA025-I/MS datasheet, 24AA025-I/MS pinout, 24AA025-I/MS application, or 24AA025-I/MS equivalent, key selection considerations include its SOT-23-6 package, absence of hardware write-protect (WP pin not connected), I²C bus compatibility up to eight devices, and low-power operation with 1 μA standby current.

Technical Context

The 24AA025-I/MS implements a standard two-wire I²C interface with open-drain SDA/SCL requiring external pull-ups, Schmitt-trigger inputs for noise immunity, and internal slope control to suppress ground bounce. Its address decoding uses A0/A1 pins (A2 unconnected in SOT-23), enabling up to four devices on one bus.

It supports byte and page write operations with self-timed 5 ms maximum erase/write cycle, automatic address pointer incrementing during sequential reads, and acknowledge polling for write-cycle completion detection-no WP pin functionality is present, distinguishing it from 24AA024 variants.

Key Specifications

Pinout & Package

24AA025-I/MS is housed in a 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for space-constrained PCB layouts. The package has no exposed pad and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC025-I/MS, the 24AA025-I/MS enables lower-voltage operation down to 1.7V and targets industrial-grade applications, while AT24C02C-SSHM-T offers hardware write protection and SOIC-8 packaging-neither is pin-compatible, but both serve overlapping configuration-storage roles.

Availability

24AA025-I/MS is available at Aetrix Electronics and suitable for smart sensor calibration, embedded controller configuration, and power management unit settings requiring stable component supply and long-term obsolescence support.

Supply support for 24AA025-I/MS 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.

The 24AA025-I/MS belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-power, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components.

FAQ

What is the maximum I²C clock frequency supported by the 24AA025-I/MS?

The 24AA025-I/MS supports up to 400 kHz I²C clock frequency when VCC is ≥1.8V. At VCC between 1.7V and 1.8V, the maximum clock rate is limited to 100 kHz to ensure timing margin compliance. This dual-speed capability allows flexible integration across 1.8V, 3.3V, and 5V systems while maintaining signal integrity.

Does the 24AA025-I/MS have a hardware write-protect (WP) pin?

No, the 24AA025-I/MS does not include a functional hardware write-protect pin. As confirmed in the datasheet, the WP pin is not internally connected on any 24XX025 variant-including the 24AA025-I/MS in MSOP and SOT-23 packages. Write protection must be implemented in software or via external logic if required.

How many 24AA025-I/MS devices can be connected on a single I²C bus?

Up to four 24AA025-I/MS devices can share one I²C bus. Because the SOT-23 package lacks the A2 pin, only A0 and A1 are available for slave address configuration, yielding four unique 7-bit addresses (1010000, 1010001, 1010010, 1010011). This matches the datasheet specification for SOT-23 variants.

What is the page write buffer size of the 24AA025-I/MS?

The 24AA025-I/MS features a 16-byte page write buffer. This allows up to 16 bytes to be loaded into the internal buffer before initiating the self-timed 5 ms write cycle. Writing across a physical page boundary causes wraparound within the same page, so firmware must manage address alignment to avoid unintended overwrites.

Is the 24AA025-I/MS compatible with 1.8V microcontrollers?

Yes, the 24AA025-I/MS is fully compatible with 1.8V microcontrollers. It operates from 1.7V to 5.5V, meets I²C voltage-level requirements at 1.8V (VIH = 0.7×VCC ≈ 1.26V, VIL = 0.3×VCC ≈ 0.54V), and specifies AC timing for 100 kHz operation down to 1.7V. No level-shifting circuitry is required for direct interface.