Microchip Technology 24AA1026-I/P

Overview

24AA1026-I/P from Microchip Technology is a 128K × 8 (1024 Kbit) I²C-compatible serial EEPROM with 1.7V–5.5V supply range, 400 kHz max clock (100 kHz below 2.5V), and industrial temperature rating (–40°C to +85°C). It features 128-byte page write buffer, hardware write-protection via WP pin, Schmitt-trigger inputs, and >1 million erase/write cycles - deployed in embedded systems for configuration storage, calibration data retention, and firmware parameter backup.

For engineers reviewing the 24AA1026-I/P datasheet, 24AA1026-I/P pinout, 24AA1026-I/P application, or 24AA1026-I/P equivalent, key selection criteria include voltage compatibility (1.7V min), I²C timing compliance at 400 kHz, page-write boundary handling, WP pin logic behavior, and PDIP-8 package mechanical fit in legacy board layouts.

Technical Context

The 24AA1026-I/P implements a two-wire I²C slave interface with fixed 4-bit control code (1010b), user-configurable A1/A2 address bits enabling up to four devices on one bus, and block-select bit B0 for accessing dual 512 Kbit memory segments (00000h–0FFFFh and 10000h–1FFFFh). Its internal address pointer supports current-address, random, and sequential reads across segment boundaries.

Write operations use self-timed erase/write cycles with typical 3 ms page write time; acknowledge polling is required to detect completion. The device employs slope-controlled outputs to suppress ground bounce and Schmitt-trigger inputs (V_HYS ≥ 0.05 V_CC) for noise immunity on SDA/SCL lines.

Key Specifications

Pinout & Package

24AA1026-I/P is supplied in an 8-lead PDIP (Plastic Dual In-Line Package) with 300-mil body width, through-hole mounting, and RoHS-compliant matte tin plating. Pin 1 is marked by notch or dot; package conforms to JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA1026-I/P, the 24LC1026-I/P trades voltage flexibility for established qualification in 2.5V+ systems, while the AT24C1024 offers higher clock rate at the cost of halved page buffer depth - impacting bulk write latency in configuration-heavy applications.

Availability

24AA1026-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart meter firmware patch storage requiring stable component supply across extended product lifecycles.

Supply support for 24AA1026-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 is a leading provider of microcontroller, analog, FPGA, and memory solutions, emphasizing reliability, longevity, and broad ecosystem support for embedded applications.

The 24AA1026-I/P belongs to Microchip's 24XX serial EEPROM family, designed specifically for low-power, high-reliability nonvolatile data storage in space-constrained industrial and medical systems.

FAQ

What is the minimum operating voltage for the 24AA1026-I/P?

The 24AA1026-I/P operates down to 1.7V V_CC, making it compatible with 1.8V logic families and energy-harvesting systems. Below 2.5V, its maximum I²C clock frequency is limited to 100 kHz to ensure timing margin - a constraint explicitly defined in the DS20002270E datasheet AC characteristics table.

How does the WP pin function on the 24AA1026-I/P?

The WP (Write-Protect) pin on the 24AA1026-I/P is active-high: tying it to VCC disables all write operations (byte and page), while reads remain fully functional. The pin state is sampled at the Stop condition edge of each write command - toggling WP mid-cycle has no effect, ensuring deterministic protection behavior during power transitions.

Can the 24AA1026-I/P perform sequential reads across its full 1024 Kbit address space?

No - sequential reads on the 24AA1026-I/P are bounded by internal 512 Kbit segments (00000h–0FFFFh and 10000h–1FFFFh). To read across both blocks, software must issue two separate sequential read commands with appropriate B0 bit settings; automatic rollover occurs only within each segment.

What is the page write buffer size of the 24AA1026-I/P, and how does it affect memory management?

The 24AA1026-I/P has a 128-byte page write buffer. Writes crossing physical page boundaries (every 128-byte aligned address) wrap within the current page instead of advancing - requiring firmware to split multi-page writes. This design minimizes silicon area but mandates careful address alignment in host drivers.

Is the 24AA1026-I/P pin-compatible with other devices in the 24XX1026 family?

Yes - the 24AA1026-I/P shares identical 8-pin PDIP pinout, signal definitions, and electrical interface with 24LC1026-I/P and 24FC1026-I/P. However, voltage ranges and max clock frequencies differ: 24AA1026 supports 1.7V–5.5V/400 kHz, 24LC1026 requires ≥2.5V, and 24FC1026 supports 1 MHz above 2.5V.