Microchip Technology 24FC08T-E/OT

Overview

24FC08T-E/OT 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 extended temperature range (–40°C to +125°C). It targets embedded systems requiring nonvolatile parameter storage in automotive and industrial control modules.

For engineers reviewing the 24FC08T-E/OT datasheet, 24FC08T-E/OT pinout, 24FC08T-E/OT application, or 24FC08T-E/OT equivalent, key selection criteria include its 1 MHz I²C speed at 1.7V–5.5V, E-temp qualification, SOIC-8 (OT) package, WP-enabled memory protection, and 1 million write cycles with >200-year data retention.

Technical Context

The 24FC08T-E/OT implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes a 16-byte page latch, address pointer, and HV generator for EEPROM programming - enabling self-timed erase/write cycles without external timing components.

It supports three read modes (current address, random, sequential) and two write modes (byte and page), with acknowledge polling for write-cycle completion detection. The device uses a fixed 4-bit control code (1010) plus 2-bit block select (B1/B0) and R/W bit for addressing - allowing access to all 1024 bytes across four 256-word blocks.

Key Specifications

Pinout & Package

24FC08T-E/OT is supplied in an 8-lead SOIC package (JEDEC MS-012, package code OT), with 3.90 mm body width, 1.27 mm pitch, and exposed pad not present (standard SOIC). Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA08T-I/OT and AT24C08D-SSHM-T, the 24FC08T-E/OT delivers higher-speed I²C communication, extended temperature operation, and hardware-enforced write protection - making it the optimal choice for automotive, energy, and mission-critical industrial applications demanding reliability and performance.

Availability

24FC08T-E/OT is available at Aetrix Electronics and suitable for automotive ECU calibration storage, industrial PLC configuration backup, and medical device parameter retention requiring stable component supply across long product lifecycles.

Supply support for 24FC08T-E/OT 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, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.

The 24FC08T-E/OT belongs to Microchip's 24XX08 family of serial EEPROMs, designed specifically for robust, low-power nonvolatile data storage in space-constrained embedded systems requiring I²C interface simplicity and extended environmental resilience.

FAQ

What is the maximum I²C clock frequency supported by the 24FC08T-E/OT?

The 24FC08T-E/OT supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range - verified per DS20001710M AC Characteristics Table 1-1. This exceeds the 400 kHz limit of 24AA08/24LC08B variants and enables faster parameter writes in time-critical applications. Operation at 1 MHz requires appropriate pull-up resistors (typically 2 kΩ) and controlled bus capacitance.

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

Yes, the 24FC08T-E/OT requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. For 1 MHz operation, a 2 kΩ pull-up to VCC is recommended; for 400 kHz, 4.7 kΩ is typical. The value must be selected based on bus capacitance and desired rise time - per Figure 1-1 timing diagrams in the 24FC08 datasheet.

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

On the 24FC08T-E/OT, the WP pin provides hardware-level write inhibition: when tied to VCC, the entire 1024-byte memory array is locked against write and page-write commands, while reads remain fully functional. When tied to VSS (or left floating, though not recommended), normal read/write access is enabled. This feature is implemented independently of software control and remains active during power transitions.

Is the 24FC08T-E/OT AEC-Q100 qualified and what grade does it meet?

Yes, the 24FC08T-E/OT is AEC-Q100 qualified and meets Grade 1 requirements (–40°C to +125°C ambient operating temperature). This qualification is explicitly stated in the "Features" section of DS20001710M and confirmed in the Device Selection Table - validating its suitability for automotive powertrain, chassis, and ADAS applications where reliability under thermal stress is mandatory.

What is the page write buffer size and how does it affect write efficiency?

The 24FC08T-E/OT features a 16-byte page write buffer, meaning up to 16 contiguous bytes can be written in a single I²C transaction before initiating the internal 5 ms write cycle. This reduces bus arbitration overhead and host CPU involvement compared to byte-wise writes - improving throughput by up to 16× for block updates. Page boundaries align to 16-byte offsets (0x00–0x0F, 0x10–0x1F, etc.), and crossing boundaries causes wraparound within the current page.