Microchip Technology 24FC1026T-I/SN

Overview

24FC1026T-I/SN from Microchip Technology is a 128K × 8 (1024 Kbit) I²C-compatible serial EEPROM with 1 MHz maximum clock frequency, 1.8V–5.5V supply range, 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 24FC1026T-I/SN datasheet, 24FC1026T-I/SN pinout, 24FC1026T-I/SN application, or 24FC1026T-I/SN equivalent, key selection criteria include its 1 MHz I²C speed at V_CC ≥ 2.5V, 5 µA standby current, 450 µA read current, and 128-byte page write capability for efficient nonvolatile data logging in space-constrained designs.

Technical Context

The 24FC1026T-I/SN implements a two-wire I²C interface with master-controlled clock (SCL) and bidirectional open-drain data (SDA), supporting standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes depending on V_CC. Its internal address counter enables sequential reads across two 512 Kbit blocks (00000h–0FFFFh and 10000h–1FFFFh), while A1/A2 pins configure device addressing for up to four devices on one bus.

Write operations use self-timed erase/write cycles with 3 ms typical page write time and automatic wraparound protection within 128-byte physical pages. Hardware write-protection is asserted when WP = V_CC, disabling all writes while permitting reads-critical for safeguarding boot configuration or security keys during field operation.

Key Specifications

Pinout & Package

24FC1026T-I/SN is housed in an 8-lead SOIC package (3.90 mm width), RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot; package thickness is 1.70 mm nominal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1026-I/SN, the 24FC1026T-I/SN delivers 2.5× faster configuration writes and wider voltage compatibility; versus AT24C1024-SSHL-T, it provides superior noise immunity and 200× lower standby current-making it optimal for battery-powered and harsh-environment designs.

Availability

24FC1026T-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 24FC1026T-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.

The 24FC1026T-I/SN belongs to Microchip's 24XX1026 family of high-density I²C EEPROMs, designed specifically for reliable, low-power, long-life nonvolatile data storage in industrial, medical, and automotive systems.

FAQ

What is the maximum I²C clock frequency supported by the 24FC1026T-I/SN?

The 24FC1026T-I/SN supports up to 1 MHz I²C clock frequency when V_CC is between 2.5V and 5.5V. At V_CC = 1.8V–2.5V, the maximum clock rate is 400 kHz. This dual-speed capability allows designers to optimize for speed in 3.3V/5V systems or maintain compatibility with 1.8V logic domains without sacrificing performance unnecessarily.

How does the hardware write-protect (WP) pin function on the 24FC1026T-I/SN?

On the 24FC1026T-I/SN, the WP pin is active-high: when tied to V_CC, all write operations-including byte, page, and erase-are inhibited, while read operations remain fully functional. The pin state is sampled at the Stop bit of each write command, so toggling WP mid-cycle has no effect. This provides deterministic, hardware-level protection for critical configuration data.

What is the page size and write buffer capacity of the 24FC1026T-I/SN?

The 24FC1026T-I/SN has a fixed 128-byte page size and an on-chip 128-byte write buffer. Page writes must remain within a single physical page boundary (addresses aligned to multiples of 128); crossing boundaries causes wraparound. This architecture enables efficient bulk writes but requires firmware to manage address alignment-unlike byte-write-only EEPROMs.

Does the 24FC1026T-I/SN support sequential reads across its full 1024 Kbit memory space?

No-the 24FC1026T-I/SN divides its memory into two 512 Kbit segments (00000h–0FFFFh and 10000h–1FFFFh), and sequential reads automatically roll over within each segment only. To read across both segments, the host must issue separate random-read commands or reinitialize the address pointer-this architectural limitation prevents seamless full-array streaming.

What package type and lead finish does the 24FC1026T-I/SN use?

The 24FC1026T-I/SN is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm wide, with matte tin (Sn) lead finish per JEDEC J-STD-020. The "T" in the part number denotes tape-and-reel packaging, and "I/SN" specifies industrial temperature grade and SOIC package-verified per Microchip drawing C04-018D.