Microchip Technology 24FC256T-I/MNY

Overview

24FC256T-I/MNY from Microchip Technology is a 256-Kbit (32K × 8) I²C-compatible serial EEPROM with 1.7V–5.5V single-supply operation, 1 MHz maximum clock frequency at V_CC ≥ 2.5V, and industrial temperature range (–40°C to +85°C). It features a 64-byte page write buffer, hardware write-protection via the 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 24FC256T-I/MNY datasheet, 24FC256T-I/MNY pinout, 24FC256T-I/MNY application, or 24FC256T-I/MNY equivalent, key selection criteria include its 1 MHz I²C speed capability at low voltage, 5 ms max page write time, 1 µA standby current, and MNY package (8-lead TSSOP) compatibility with space-constrained industrial control modules.

Technical Context

The 24FC256T-I/MNY implements a two-wire I²C interface with programmable device addressing via A0–A2 pins, supporting up to eight devices on one bus. Its internal architecture includes a 64-byte page latch, HV generator for EEPROM programming, and memory control logic enabling self-timed erase/write cycles without external timing components.

It uses open-drain SDA/SCL with internal Schmitt triggers and slope control to suppress ground bounce and noise. Write protection is implemented through level-sensitive WP pin sampling at the Stop bit, and acknowledge polling is supported to detect write cycle completion without fixed delay timing.

Key Specifications

Pinout & Package

24FC256T-I/MNY is packaged in an 8-lead TSSOP (MNY), with exposed pad not connected. Pin functions are electrically identical to SOIC and TDFN variants but optimized for surface-mount density and thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA256T-I/MNY and AT24C256-SSHL-T, the 24FC256T-I/MNY uniquely delivers 1 MHz I²C performance *with* industrial temperature rating and AEC-Q100 qualification - making it the only option for high-speed, mission-critical embedded storage in harsh environments.

Availability

24FC256T-I/MNY is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data retention, and automotive body control module settings requiring stable component supply across extended product lifecycles.

Supply support for 24FC256T-I/MNY 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 communications markets with high-reliability semiconductor products.

The 24FC256 belongs to Microchip's 24XX256 family of I²C EEPROMs, designed specifically for low-voltage, high-speed nonvolatile data storage in resource-constrained embedded systems requiring guaranteed write endurance and long-term data integrity.

FAQ

What is the maximum I²C clock frequency supported by the 24FC256T-I/MNY?

The 24FC256T-I/MNY supports up to 1 MHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC < 2.5V, the maximum clock frequency drops to 400 kHz. This dual-speed capability allows the 24FC256T-I/MNY to operate efficiently across wide voltage rails while maintaining compatibility with legacy 400 kHz systems.

Does the 24FC256T-I/MNY require external level shifting when interfaced with a 1.8V microcontroller?

No, the 24FC256T-I/MNY does not require external level shifting when used with a 1.8V microcontroller. Its 1.7V–5.5V operating range and Schmitt-trigger inputs allow direct connection to 1.8V I²C buses, provided pull-up resistors are sized appropriately (e.g., 10 kΩ for 100 kHz, 2 kΩ for 1 MHz).

How does hardware write-protection work on the 24FC256T-I/MNY?

Hardware write-protection on the 24FC256T-I/MNY is controlled by the WP pin: when tied to VCC, all write operations (byte and page) are inhibited while reads remain functional. The pin is sampled at the Stop bit of each write command, ensuring protection remains active even during partial transactions or power transients.

What is the page write buffer size of the 24FC256T-I/MNY, and why does it matter?

The 24FC256T-I/MNY has a 64-byte page write buffer. This allows up to 64 bytes of data to be loaded into the buffer and written to memory in a single self-timed cycle. It matters because it reduces I²C bus occupancy and host MCU overhead compared to byte-by-byte writes-critical for real-time systems where bus latency must be minimized.

Is the 24FC256T-I/MNY qualified for automotive applications?

Yes, the 24FC256T-I/MNY is AEC-Q100 qualified for automotive applications. While the "I" suffix denotes Industrial temperature range (–40°C to +85°C), the device meets AEC-Q100 Grade 2 stress testing requirements, making it suitable for body control modules, infotainment subsystems, and other under-hood–adjacent applications.