Microchip Technology 24FC08T-I/MUY

Overview

24FC08T-I/MUY from Microchip Technology Inc. is an 8-Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, supporting 1 MHz clock operation down to 1.7V supply, with 16-byte page write buffer, hardware write-protect (WP), and industrial temperature range (–40°C to +85°C). It is used for nonvolatile parameter storage in embedded controllers, sensor calibration modules, and power management systems.

For engineers reviewing the 24FC08T-I/MUY datasheet, 24FC08T-I/MUY pinout, 24FC08T-I/MUY application, or 24FC08T-I/MUY equivalent, key selection considerations include its 1 MHz I²C speed at 1.7V–5.5V, 5 ms max page write time, 1 µA standby current, and MUY package-specific pin compatibility with SOIC-8 footprint.

Technical Context

The 24FC08T-I/MUY implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer supports current-address, random, and sequential read modes, while the 16-byte page buffer enables efficient burst writes without host intervention between bytes.

Write protection is controlled via the dedicated WP pin - tied to VSS for full read/write access or VCC to inhibit all writes across the entire 000h–3FFh memory map. The device uses self-timed erase/write cycles and supports acknowledge polling to determine write completion without fixed delay timing.

Key Specifications

Pinout & Package

24FC08T-I/MUY is housed in an 8-lead SOIC (SN) package with 150-mil body width and standard 1.27 mm pitch. Pin 1 is marked with a notch or beveled corner; the exposed pad is not present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC08T-I/MUY, the 24AA08T-I/MS trades 1 MHz speed for lower cost in static configuration roles, while the AT24C08D-SSHM-T offers extended temperature range but removes hardware write-protection - requiring additional MCU resources to emulate the WP function.

Availability

24FC08T-I/MUY is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power management unit (PMU) designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24FC08T-I/MUY 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC08T-I/MUY belongs to Microchip's 24XX08 family of I²C EEPROMs, engineered specifically for low-voltage, low-power embedded systems requiring reliable nonvolatile storage with minimal board space and power budget impact.

FAQ

What is the maximum I²C clock frequency supported by the 24FC08T-I/MUY?

The 24FC08T-I/MUY supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range, unlike the 24AA08 (max 400 kHz) or 24LC08B (max 400 kHz, min 2.5V). This enables faster configuration loads in time-critical applications such as real-time sensor fusion engines. The 24FC08T-I/MUY maintains full AC timing compliance at 1 MHz, including THIGH ≤260 ns and TLOW ≥500 ns.

Does the 24FC08T-I/MUY require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC08T-I/MUY requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. For 1 MHz operation, a 2 kΩ pull-up to VCC is recommended; for 400 kHz, 2.2 kΩ is typical. The 24FC08T-I/MUY does not include internal pull-ups, and omitting external resistors will prevent proper I²C bus arbitration and ACK generation.

How does the write-protect (WP) pin function on the 24FC08T-I/MUY?

The WP pin on the 24FC08T-I/MUY is a logic-level input: when tied to VCC, it disables all write operations (byte and page) across the full 000h–3FFh memory map while allowing unrestricted reads; when tied to VSS (or left floating, though not recommended), full read/write access is enabled. This hardware-level protection operates independently of I²C commands and remains active during power transitions.

What is the page write buffer size of the 24FC08T-I/MUY, and how does it improve efficiency?

The 24FC08T-I/MUY features a 16-byte page write buffer, allowing up to 16 consecutive bytes to be loaded into the device before initiating a single internal write cycle. This reduces I²C bus occupancy by up to 16× compared to byte-write mode and eliminates the need for 15 separate ACK handshakes. The 24FC08T-I/MUY completes the entire page write in ≤5 ms, regardless of byte count (1–16).

Is the 24FC08T-I/MUY AEC-Q100 qualified, and what does that mean for automotive use?

Yes, the 24FC08T-I/MUY is AEC-Q100 qualified (Grade 3: –40°C to +85°C), meaning it has passed stress tests for automotive-grade reliability including temperature cycling, HTOL, ESD, and mechanical shock. This qualification validates its use in non-safety-critical automotive applications such as body control modules, infotainment settings storage, and seat/mirror memory - though system-level functional safety compliance remains the responsibility of the end designer.