Microchip Technology 24AA1025-I/P

Overview

24AA1025-I/P from Microchip Technology Inc. is a 128K × 8 (1024 kbit) I²C-compatible serial EEPROM with 1.7–5.5 V supply range, 400 kHz max clock (100 kHz below 2.5 V), and industrial temperature rating (–40°C to +85°C). It features 128-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity - deployed in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter logging.

For engineers reviewing the 24AA1025-I/P datasheet, 24AA1025-I/P pinout, 24AA1025-I/P application, or 24AA1025-I/P equivalent, key selection criteria include voltage compatibility (1.7–5.5 V), I²C timing compliance at target VCC, page boundary handling in firmware, and WP pin logic polarity for secure write control.

Technical Context

The 24AA1025-I/P implements a slave-only I²C interface with fixed 4-bit device ID '1010', two user-configurable chip address bits (A0, A1), and one hardwired A2 tied to VCC - enabling up to four devices on a shared bus. Its internal memory is split into two 512 kbit segments (00000h–0FFFFh and 10000h–1FFFFh), accessed via block select bit B0 in the control byte.

Write operations support byte- and page-write modes; page writes are limited to 128-byte boundaries and trigger self-timed erase/write cycles (typ. 3 ms, max 5 ms). Read operations support current-address, random, and sequential modes - with automatic address pointer wraparound within each 512 kbit segment.

Key Specifications

Pinout & Package

24AA1025-I/P is housed in an 8-lead PDIP (Plastic Dual In-line Package) with 300-mil body width, RoHS-compliant matte tin (Sn) lead finish, and industrial-grade thermal performance (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1025-I/P, the 24AA1025-I/P enables lower-voltage operation down to 1.7 V - critical for energy-harvesting or coin-cell designs - while matching industrial temp grade and 128-byte page efficiency. Against AT24C1024, it trades higher clock speed for larger page buffer and simpler address management.

Availability

24AA1025-I/P is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for 24AA1025-I/P 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 manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and consumer applications.

The 24AA1025-I/P belongs to Microchip's 24XX serial EEPROM family, engineered for ultra-low-power, high-reliability data retention in resource-constrained embedded systems with stringent longevity requirements.

FAQ

What is the minimum VCC voltage supported by the 24AA1025-I/P?

The 24AA1025-I/P operates down to 1.7 V, enabling compatibility with 1.8 V logic systems and low-power applications such as battery-backed sensors. Below 2.5 V, its maximum I²C clock frequency is reduced to 100 kHz to maintain timing margin and reliability - verified in DC and AC characteristics tables of the official datasheet DS20001941L.

How does the WP pin function on the 24AA1025-I/P?

The WP (Write-Protect) pin on the 24AA1025-I/P is a hardware-level enable/disable control: when tied to VCC, all write operations (byte and page) are inhibited while reads remain fully functional; when tied to VSS, full read/write access is granted. The pin state is sampled at the Stop bit of each write command - toggling WP mid-cycle has no effect.

Can the 24AA1025-I/P be used with more than one device on the same I²C bus?

Yes, the 24AA1025-I/P supports cascading up to four devices on a single I²C bus using the A0 and A1 pins to configure unique 7-bit slave addresses (1010 A1 A0 xx). The A2 pin must be tied to VCC and is not used for addressing - this architecture allows up to 4 Mbit total EEPROM capacity without bus arbitration conflicts.

What is the page size and write time for the 24AA1025-I/P?

The 24AA1025-I/P has a 128-byte page write buffer and typical page write time of 3 ms (maximum 5 ms). Page writes must stay within physical page boundaries (e.g., 0x0000–0x007F); crossing boundaries causes data wraparound instead of sequential advancement - firmware must enforce alignment to avoid corruption.

Does the 24AA1025-I/P support sequential reads across its full 1024 kbit memory space?

No, sequential reads on the 24AA1025-I/P are limited to 512 kbit segments: addresses 00000h–0FFFFh and 10000h–1FFFFh. After reaching 0FFFFh, the internal address pointer wraps to 00000h; after 1FFFFh, it wraps to 10000h. To read the full array sequentially, two separate read commands - one per segment - are required.