Microchip Technology 24FC1026-I/SN

Overview

24FC1026-I/SN from Microchip Technology is a 128K × 8 (1024 Kbit) I²C-compatible serial EEPROM with 1.8V–5.5V supply range, 1 MHz maximum clock frequency, 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 24FC1026-I/SN datasheet, 24FC1026-I/SN pinout, 24FC1026-I/SN application, or 24FC1026-I/SN equivalent, key selection criteria include voltage compatibility (1.8V min), high-speed I²C timing (1 MHz at VCC ≥ 2.5V), page write latency (3 ms typical), ESD robustness (>4 kV), and cascading support for up to four devices on one bus.

Technical Context

The 24FC1026-I/SN implements a two-wire I²C slave interface with fixed 7-bit address prefix '1010' and user-configurable A1/A2 bits enabling up to four devices per bus. Its internal memory is split into two 512 Kbit blocks selected by the B0 bit, requiring explicit block addressing for full 1024 Kbit access.

It uses on-chip charge pump (HV generator) for EEPROM programming, supports byte and page writes with self-timed erase/write cycles, and employs slope-controlled outputs to suppress ground bounce. Write protection is asserted when WP = VCC, disabling all writes while permitting reads.

Key Specifications

Pinout & Package

24FC1026-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 3.90 mm body width, RoHS-compliant matte tin lead finish, and standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC1026-I/SN, the 24FC1026-I/SN delivers higher speed and lower voltage operation at identical package and pinout; versus AT24C1024-SSHL-T, it provides explicit block addressing for legacy-compatible memory mapping but requires additional B0 bit handling in firmware.

Availability

24FC1026-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 product lifecycles.

Supply support for 24FC1026-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 Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC1026 belongs to Microchip's 24XX1026 family of high-density I²C EEPROMs engineered for low-power, wide-voltage industrial and automotive applications demanding robust data retention and noise-immune communication.

FAQ

What is the minimum operating voltage for the 24FC1026-I/SN?

The 24FC1026-I/SN operates down to 1.8V, enabling direct interface with 1.8V and 2.5V logic domains without level shifters. This specification is confirmed in the Device Selection Table and Electrical Characteristics section of DS20002270E, where VCC range is explicitly stated as 1.8V–5.5V for the 24FC1026 variant. Below 1.8V, the device will not function reliably, and I²C timing margins degrade significantly.

Does the 24FC1026-I/SN support 1 MHz I²C communication across its full voltage range?

Yes, the 24FC1026-I/SN supports 1 MHz I²C clock frequency when VCC is 2.5V or higher, as specified in Table 1-2 (AC Characteristics). At VCC between 1.8V and 2.5V, maximum clock frequency is 400 kHz. This dual-speed capability is unique to the FC variant and distinguishes it from the AA and LC versions, which are limited to 100/400 kHz.

How does the WP pin function on the 24FC1026-I/SN?

The WP (Write-Protect) pin on the 24FC1026-I/SN is a hardware enable input: when tied to VCC, all write operations (byte and page) are inhibited while read operations remain fully functional. The pin state is sampled at the Stop bit of each write command, and toggling WP mid-cycle has no effect. This provides fail-safe protection against spurious writes during power transitions.

What is the page size and write time for the 24FC1026-I/SN?

The 24FC1026-I/SN has a 128-byte page write buffer and a typical page write time of 3 ms, with a maximum of 5 ms per AC Characteristic Table 1-2 (TWC). This applies to both byte and page writes, as all writes trigger the same self-timed internal erase/write cycle. The 128-byte buffer allows efficient bulk updates without exceeding physical page boundaries.

Can multiple 24FC1026-I/SN devices share the same I²C bus?

Yes, up to four 24FC1026-I/SN devices can be cascaded on a single I²C bus using the A1 and A2 address inputs. These pins configure the two most significant bits of the 7-bit slave address (prefix '1010'), yielding four unique addresses: 101000x, 101001x, 101010x, and 101011x - where x is the block select bit B0. No external address decoding logic is required.