Microchip Technology 24FC01T-I/MS

Overview

24FC01T-I/MS from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 1 MHz maximum clock frequency, and operation down to 1.7V. It features an 8-byte page write buffer, Schmitt-trigger inputs, and supports industrial (–40°C to +85°C) and extended (–40°C to +125°C) temperature ranges in MSOP-8 package. Used for firmware storage, calibration data retention, and configuration parameter backup in embedded controllers.

For engineers reviewing the 24FC01T-I/MS datasheet, 24FC01T-I/MS pinout, 24FC01T-I/MS application, or 24FC01T-I/MS equivalent, key selection criteria include 1 MHz I²C speed at 1.7V, WP-enabled hardware-level write protection, 5 ms max page write time, endurance of 1 million cycles, and compatibility with noise-prone industrial bus environments requiring slope control and ESD >4 kV.

Technical Context

The 24FC01T-I/MS implements a two-wire I²C interface with fixed 7-bit client address (1010xxx), where the three least-significant bits are "don't care" - enabling single-device addressing without A0–A2 pin usage. Its internal architecture includes a page latch buffer, HV generator for EEPROM programming, and memory control logic that manages self-timed erase/write cycles independent of host timing.

It supports all three I²C read modes (current address, random, sequential) and uses acknowledge polling to detect write completion. The device enforces strict bus protocol compliance: SDA transitions only during SCL low, Schmitt-triggered inputs suppress noise, and output slope control minimizes ground bounce - critical for mixed-signal systems sharing noisy PCB return paths.

Key Specifications

Pinout & Package

8-Lead MSOP (Micro Small Outline Package) with exposed pad option; compact 3.0 mm × 3.0 mm footprint, 0.65 mm pitch, suitable for space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01T-I/MS and AT24C01D-SSHM-T, the 24FC01T-I/MS uniquely delivers 1 MHz operation across the full 1.7–5.5V range and extended temperature support - making it the only option for high-speed, wide-voltage, harsh-environment applications without redesigning power or thermal management.

Availability

24FC01T-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter firmware requiring stable component supply across extended temperature and voltage ranges.

Supply support for 24FC01T-I/MS 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, FPGA, and memory solutions, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.

The 24FC01T-I/MS belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for robust, low-power, I²C-based nonvolatile data storage in space- and power-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24FC01T-I/MS?

The 24FC01T-I/MS supports up to 1 MHz I²C clock frequency across its full 1.7V to 5.5V supply range - unlike 24AA01 or 24LC01B variants limited to 400 kHz or 100 kHz at low voltage. This allows faster parameter writes in time-sensitive applications such as real-time motor control calibration. The 24FC01T-I/MS achieves this via optimized internal timing circuits validated for 1 MHz operation at 1.7V.

Does the 24FC01T-I/MS require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC01T-I/MS requires external pull-up resistors on both SDA and SCL because its I/O pins are open-drain. For 1 MHz operation, a 2 kΩ pull-up to VCC is recommended per the datasheet. Incorrect resistor values cause timing violations - e.g., 10 kΩ works for 100 kHz but fails setup/hold times at 1 MHz. The 24FC01T-I/MS does not integrate internal pull-ups.

How does the Write-Protect (WP) pin function on the 24FC01T-I/MS?

When the WP pin of the 24FC01T-I/MS is driven high (tied to VCC), all write operations to the entire 128-byte memory array (addresses 00h–7Fh) are inhibited - reads remain fully functional. This provides hardware-level security against accidental or malicious overwrites. Tying WP to VSS enables normal read/write access. No software command or register setting overrides this physical protection.

Is the 24FC01T-I/MS AEC-Q100 qualified?

Yes, the 24FC01T-I/MS is AEC-Q100 qualified for automotive applications. It meets Grade 1 requirements (–40°C to +125°C operating temperature) and has passed stress testing including HTOL, TC, and ESD per AEC-Q100 Rev H. This qualification is explicitly stated in the device selection table and applies to the 24FC01 variant - not the 24AA01 or 24LC01B - confirming its suitability for under-hood and cabin electronics.

What is the page write capability of the 24FC01T-I/MS?

The 24FC01T-I/MS supports an 8-byte page write buffer: up to eight consecutive bytes can be loaded into the buffer and written to memory with a single Stop condition. This reduces I²C transaction overhead by up to 8× versus byte writes. Page boundaries align every 8 bytes (00h–07h, 08h–0Fh, etc.), and crossing boundaries causes wraparound - so software must validate address alignment before initiating page writes.