Microchip Technology 24AA1026-I/SN

Overview

24AA1026-I/SN from Microchip Technology is a 128K × 8 (1024 Kbit) I²C-compatible serial EEPROM with industrial temperature range (–40°C to +85°C), 1.7V–5.5V supply voltage, and 400 kHz max clock frequency. It features 128-byte page write buffer, hardware write-protect (WP pin), and Schmitt-trigger inputs for noise immunity-used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24AA1026-I/SN datasheet, 24AA1026-I/SN pinout, 24AA1026-I/SN application, or 24AA1026-I/SN equivalent, key selection criteria include VCC compatibility down to 1.7V, guaranteed 400 kHz operation at 2.5V–5.5V, 128-byte page write capability, WP-controlled hardware protection, and SOIC-8 package footprint compatibility with legacy 24Cxx designs.

Technical Context

The 24AA1026-I/SN implements a two-wire I²C interface with slave address decoding via A1/A2 pins, supporting up to four devices on one bus. Its internal architecture includes a 128-byte page latch, dual 512 Kbit memory blocks (00000h–0FFFFh and 10000h–1FFFFh), and block-select bit (B0) for segment addressing.

It uses on-chip charge pump for EEPROM programming, supports byte and page write modes with self-timed erase/write cycles (typ. 3 ms), and incorporates slope-controlled outputs and Schmitt-trigger inputs to suppress ground bounce and EMI-enabling reliable operation in noisy industrial environments.

Key Specifications

Pinout & Package

24AA1026-I/SN is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm wide, RoHS-compliant, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1026-I/SN and AT24C1024-SSHL-T, the 24AA1026-I/SN uniquely supports full 400 kHz operation from 2.5V–5.5V and offers double the page buffer size-delivering faster bulk writes and broader low-voltage compatibility in mixed-supply industrial systems.

Availability

24AA1026-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration backup, and automotive body control module settings requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24AA1026-I/SN 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA1026-I/SN belongs to Microchip's 24XX serial EEPROM product line, engineered for ultra-low-power, high-reliability nonvolatile data storage in space-constrained industrial and automotive applications.

FAQ

What is the maximum I²C clock frequency supported by the 24AA1026-I/SN?

The 24AA1026-I/SN supports up to 400 kHz I²C clock frequency when VCC is between 2.5V and 5.5V. At VCC < 2.5V, the maximum clock rate drops to 100 kHz. This dual-speed capability allows the 24AA1026-I/SN to operate efficiently across both 3.3V and 5V systems while maintaining backward compatibility with legacy 100 kHz buses.

Does the 24AA1026-I/SN support write-protection at the hardware level?

Yes, the 24AA1026-I/SN includes a dedicated Write-Protect (WP) pin that provides hardware-level write inhibition. When WP is tied to VCC, all write operations-including byte and page writes-are disabled, while read operations remain fully functional. This feature prevents accidental or malicious overwrites without requiring firmware intervention, making it ideal for safety-critical configuration storage.

How many devices can be connected on the same I²C bus using the 24AA1026-I/SN?

Up to four 24AA1026-I/SN devices can be cascaded on a single I²C bus using the A1 and A2 address inputs. These pins configure the two least-significant bits of the 7-bit slave address (1010 A2 A1 B0 R/W), allowing unique addressing for each device. This enables scalable memory expansion up to 4 Mbit total system EEPROM capacity without additional bus controllers.

What is the page write buffer size of the 24AA1026-I/SN, and why does it matter?

The 24AA1026-I/SN features a 128-byte page write buffer. This allows up to 128 bytes of data to be loaded into the buffer and written to memory in a single self-timed cycle (~3 ms typical). Compared to byte-write (10 ms per byte), this reduces 128-byte updates from 128 separate write cycles to one-cutting total programming time by >97% and minimizing I²C bus contention in multi-master systems.

Is the 24AA1026-I/SN compatible with standard SOIC-8 footprints used for older 24Cxx EEPROMs?

Yes, the 24AA1026-I/SN in SOIC-8 package (suffix /SN) uses JEDEC-standard 3.90 mm body width and 1.27 mm lead pitch, matching the footprint of legacy 24C02, 24C04, and 24C64 devices. Pinout is identical (NC, A1, A2, VSS, SDA, SCL, WP, VCC), enabling drop-in replacement in existing designs-provided firmware accounts for the expanded 1024 Kbit address space and dual-block architecture.