Microchip Technology 24AA1026T-I/SM

Overview

24AA1026T-I/SM 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-protect (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 24AA1026T-I/SM datasheet, 24AA1026T-I/SM pinout, 24AA1026T-I/SM application, or 24AA1026T-I/SM equivalent, key selection considerations include VCC compatibility down to 1.7V, I²C bus noise immunity via hysteresis, page-write timing (3 ms typical), WP-controlled write inhibition, and cascading support for up to four devices on one bus.

Technical Context

The 24AA1026T-I/SM implements a two-wire I²C slave interface with fixed 4-bit control code (1010b) and user-configurable A1/A2 address bits enabling up to four devices per bus. Its internal memory is segmented into two 512 Kbit blocks selected by the B0 bit, limiting sequential reads to 00000h–0FFFFh or 10000h–1FFFFh boundaries.

Write operations support byte and page modes; page writes buffer up to 128 bytes before initiating self-timed internal erase/write (5 ms max). The WP pin samples at the Stop bit to enable/disable writes, and Schmitt-trigger inputs on SDA/SCL provide 0.05×VCC hysteresis for robust noise suppression in electrically noisy environments.

Key Specifications

Pinout & Package

24AA1026T-I/SM is housed in an 8-lead SOIC package (3.90 mm width, JEDEC MS-012), RoHS-compliant, with gull-wing leads and matte tin finish. 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 24AA1026T-I/SM, the 24LC1026T-I/SM trades wider voltage flexibility for stricter VCC minimum and extended temperature range, while the AT24C1024-SSHL-T eliminates address boundary constraints at the cost of missing dedicated hardware write-protect.

Availability

24AA1026T-I/SM is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24AA1026T-I/SM 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 microcontroller, analog, FPGA, and memory solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The 24AA1026T-I/SM belongs to Microchip's 24XX1026 family of I²C EEPROMs, designed specifically for low-voltage, low-power embedded systems needing robust nonvolatile storage with minimal external components.

FAQ

What is the minimum VCC voltage supported by the 24AA1026T-I/SM?

The 24AA1026T-I/SM operates down to 1.7V, enabling direct integration with 1.8V logic families and ultra-low-power systems. Below 2.5V, its I²C clock frequency is limited to 100 kHz to ensure reliable timing margins. This specification is validated across the full industrial temperature range (–40°C to +85°C) and documented in DS20002270E, Table 1-2.

How does the WP pin function on the 24AA1026T-I/SM?

The WP (Write-Protect) pin on the 24AA1026T-I/SM is sampled at the Stop bit of each I²C write command. When tied to VCC, it disables all write operations (byte and page) while allowing unlimited reads. No software configuration is needed - protection is purely hardware-based and active immediately upon power-up. This behavior is confirmed in Section 2.4 and Figure 1-1 of DS20002270E.

Can the 24AA1026T-I/SM perform sequential reads across its entire 1024 Kbit memory space?

No. The 24AA1026T-I/SM divides memory into two 512 Kbit blocks (00000h–0FFFFh and 10000h–1FFFFh), and sequential reads automatically roll over within each block but cannot cross the boundary. To read the full array, software must issue separate read commands with explicit B0 bit control. This architectural constraint is defined in Section 5.0 and Figure 5-1 of DS20002270E.

What is the typical page write time for the 24AA1026T-I/SM, and how is it measured?

The typical page write time for the 24AA1026T-I/SM is 3 ms, measured from the Stop condition that terminates the page write command to completion of the internal self-timed erase/write cycle. The maximum specified time is 5 ms. This value is independent of the number of bytes written (1–128) and applies across the full VCC and temperature range. It is verified per Table 1-2, Parameter TWC in DS20002270E.

Does the 24AA1026T-I/SM support cascading with other I²C EEPROMs on the same bus?

Yes. The 24AA1026T-I/SM uses A1 and A2 pins to configure two bits of its 7-bit I²C slave address (base 1010b), allowing up to four devices on a single bus. Each device must have a unique A1/A2 combination (00, 01, 10, 11). This cascading capability is explicitly stated in the Device Selection Table and Section 2.1 of DS20002270E.