Microchip Technology 24AA1026T-I/SN

Overview

24AA1026T-I/SN 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, 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 24AA1026T-I/SN datasheet, 24AA1026T-I/SN pinout, 24AA1026T-I/SN application, or 24AA1026T-I/SN equivalent, key selection criteria include voltage compatibility down to 1.7V, guaranteed 400 kHz operation at VCC ≥ 2.5V, 128-byte page write capability, hardware write-protect functionality, and SOIC-8 packaging with industry-standard pinout.

Technical Context

The 24AA1026T-I/SN implements a two-wire I²C interface with slave address decoding using A1/A2 pins, supporting up to four devices on one bus. Its internal architecture includes a 128-byte page latch, EEPROM array segmented into two 512 Kbit blocks (addressed via B0 bit), and on-chip HV generator for write/erase operations.

It supports byte and page write modes with self-timed erase/write cycles (typ. 3 ms), acknowledges only after successful command receipt, and uses acknowledge polling to detect write completion. The device enforces strict I²C timing-including THD:STA ≥ 600 ns and TSU:DAT ≤ 100 ns at 5.5V-with slope-controlled outputs to suppress ground bounce.

Key Specifications

Pinout & Package

24AA1026T-I/SN is housed in an 8-lead SOIC package (3.90 mm width), RoHS-compliant, with standard pin spacing and gull-wing leads suitable for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1026T-I/SN and AT24C1024-SSHL-T, the 24AA1026T-I/SN uniquely supports 1.7V operation while retaining 128-byte page writes-making it optimal for ultra-low-voltage embedded systems needing minimal I²C transactions and maximum voltage flexibility.

Availability

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

Supply support for 24AA1026T-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 microcontroller, analog, FPGA, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated silicon and development tools.

The 24AA1026T-I/SN belongs to Microchip's 24XX1026 family of I²C EEPROMs designed specifically for reliable, low-power, multi-voltage nonvolatile data storage in space-constrained embedded systems.

FAQ

What is the minimum operating voltage for the 24AA1026T-I/SN?

The 24AA1026T-I/SN operates down to 1.7V, enabling direct interface with 1.8V logic families and battery-powered systems under brown-out conditions. This is lower than the 2.5V minimum of the 24LC1026T-I/SN variant and makes the 24AA1026T-I/SN suitable for ultra-low-power designs where supply headroom is constrained. Operation at 1.7V limits maximum clock frequency to 100 kHz, which remains sufficient for configuration storage and infrequent parameter updates.

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

The WP (Write-Protect) pin on the 24AA1026T-I/SN is a hardware-level enable that inhibits all write operations-including byte, page, and erase-when pulled high to VCC. When tied to VSS, full read/write access is granted. The pin is sampled at the Stop condition of each write command, so toggling WP mid-cycle has no effect. This provides deterministic, glitch-immune protection against unintended writes during firmware updates or system resets-critical for safety-critical applications using the 24AA1026T-I/SN.

Can the 24AA1026T-I/SN be used in a multi-device I²C system?

Yes, the 24AA1026T-I/SN supports cascading up to four devices on a single I²C bus using its A1 and A2 address inputs. These pins configure the two least-significant bits of the 7-bit slave address (base 1010xxx), allowing unique addressing without external logic. Each device can be independently accessed, and combined capacity reaches 4 Mbit. However, sequential reads cannot cross device boundaries-the 24AA1026T-I/SN's internal addressing is limited to 512 Kbit segments, requiring explicit address management in multi-device configurations.

What is the page write buffer size of the 24AA1026T-I/SN, and why does it matter?

The 24AA1026T-I/SN features a 128-byte page write buffer, meaning up to 128 contiguous bytes can be loaded into the buffer and written to memory in a single self-timed cycle. This reduces I²C bus transactions by up to 128× compared to byte writes, lowering host CPU overhead and bus contention. Because page writes wrap within physical boundaries, software must align writes to 128-byte boundaries-misaligned writes overwrite earlier data in the same page. This design optimizes throughput for firmware metadata or calibration tables stored in aligned blocks.

Does the 24AA1026T-I/SN support standard I²C timing requirements?

Yes, the 24AA1026T-I/SN fully complies with standard I²C timing specifications, including START/STOP hold/setup times, data validity windows, and clock high/low periods. At VCC = 5.5V, it meets fast-mode (400 kHz) requirements with THD:STA ≥ 600 ns, TSU:DAT ≤ 100 ns, and TAA ≤ 900 ns. Its Schmitt-trigger inputs and controlled output slopes further enhance noise immunity beyond base I²C specs-making the 24AA1026T-I/SN robust in electrically noisy environments like industrial controls or automotive subsystems.