Microchip Technology 24FC08T-I/OT

Overview

24FC08T-I/OT from Microchip Technology Inc. is an 8-Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, supporting 1 MHz clock frequency at 1.7–5.5 V supply, with hardware write-protection via WP pin and 16-byte page write buffer. It operates across -40°C to +85°C (Industrial grade) in 8-lead SOT-23 package and is used for configuration storage in embedded microcontroller systems.

For engineers reviewing the 24FC08T-I/OT datasheet, 24FC08T-I/OT pinout, 24FC08T-I/OT application, or 24FC08T-I/OT equivalent, key selection criteria include its 1 MHz I²C speed, 1.7 V minimum operating voltage, industrial temperature range, SOT-23 footprint compatibility, and hardware write-protect functionality for secure parameter retention.

Technical Context

The 24FC08T-I/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, HV generator for EEPROM programming, and address pointer logic enabling current-address, random, and sequential read modes.

It supports ACK polling to detect write-cycle completion and uses a fixed 4-bit control code (1010) with 2-bit block select (B1/B0) for accessing four 256-word memory blocks. The WP pin provides full-array hardware write protection when tied to VCC, and all A0–A2 pins are unconnected and may be left floating.

Key Specifications

Pinout & Package

24FC08T-I/OT is supplied in an 5-lead SOT-23 package (JEDEC MO-178AA), with 1.6 mm × 2.9 mm footprint and 1.1 mm height. Pin 1 is SCL; pin 2 is VSS; pin 3 is SDA; pin 4 is VCC; pin 5 is WP. No A0/A1/A2 connections are present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA08T-I/OT, the 24FC08T-I/OT delivers 2.5× faster configuration loading and maintains identical low-voltage operation; versus AT24C08D-SSHM-T, it offers smaller SOT-23 footprint and integrated hardware write protection-critical for safety-critical parameter storage.

Availability

24FC08T-I/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive ECU boot settings, and smart meter firmware metadata requiring stable component supply and long-term lifecycle support.

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

The 24FC08T-I/OT belongs to Microchip's 24XX08 family of I²C EEPROMs, designed specifically for low-power, space-constrained embedded systems requiring fast, reliable, and secure nonvolatile data storage.

FAQ

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

The 24FC08T-I/OT supports up to 1 MHz I²C clock frequency across its full 1.7 V to 5.5 V supply range. This is confirmed in the Device Selection Table and AC Characteristics section of DS20001710M, distinguishing it from the 400 kHz-limited 24AA08 and 24LC08B variants. At 1.7 V, timing parameters such as THIGH (260 ns min) and TLOW (500 ns min) are specified to ensure reliable operation.

Does the 24FC08T-I/OT have hardware write protection, and how is it implemented?

Yes, the 24FC08T-I/OT includes hardware write protection via the WP pin. When WP is tied to VCC, the entire 8-Kbit memory array (addresses 000h–3FFh) is write-inhibited; read operations remain fully functional. This feature is active in all packages except the 4-ball CSP, and the 24FC08T-I/OT's SOT-23 variant fully supports it. The WP pin must be driven to a valid logic level-floating is not permitted.

What package type is used for the 24FC08T-I/OT, and what are its key mechanical dimensions?

The 24FC08T-I/OT uses a 5-lead SOT-23 package (JEDEC MO-178AA), measuring 1.6 mm × 2.9 mm with 1.1 mm maximum height. Pin 1 is SCL, pin 2 is VSS, pin 3 is SDA, pin 4 is VCC, and pin 5 is WP. This compact footprint is ideal for space-constrained PCBs in wearables and sensor modules, and is distinct from the 8-lead SOIC or DFN options listed for other 24FC08 variants.

How many erase/write cycles does the 24FC08T-I/OT guarantee, and under what conditions?

The 24FC08T-I/OT guarantees 1,000,000 erase/write cycles at 25°C and 5.5 V, as specified in Table 1-1 (Endurance) of DS20001710M. This rating applies to both byte and page write modes. Endurance is characterized-not 100% tested-but ensured by process qualification. At elevated temperatures or lower voltages, actual endurance may vary, though the 24FC08T-I/OT maintains full specification compliance across its -40°C to +85°C industrial range.

Can the 24FC08T-I/OT operate from a 1.8 V supply, and what performance trade-offs apply?

Yes, the 24FC08T-I/OT is fully specified for operation down to 1.7 V, so 1.8 V is well within its valid supply range. At 1.8 V, it maintains 1 MHz I²C capability, 1 µA standby current, and full read/write functionality. No performance trade-offs are required-unlike the 24LC08B, which mandates ≥2.5 V. This makes the 24FC08T-I/OT uniquely suitable for direct interfacing with 1.8 V microcontrollers without level translation.