Microchip Technology 24FC64FT-I/OT

Overview

24FC64FT-I/OT from Microchip Technology Inc. is a 64 Kbit I²C-compatible serial EEPROM organized as 8K × 8-bit memory with 1 MHz maximum clock frequency, 1.7–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features hardware write-protection for the upper 1/4 array (1800h–1FFFh), 32-byte page write buffer, 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 24FC64FT-I/OT datasheet, 24FC64FT-I/OT pinout, 24FC64FT-I/OT application, or 24FC64FT-I/OT equivalent, this page delivers verified electrical specs, validated pin functions, confirmed I²C timing behavior at 1 MHz, real-world use cases in low-voltage industrial nodes, and two technically documented alternative parts with precise functional and application-level distinctions.

Technical Context

The 24FC64FT-I/OT implements a standard I²C slave interface with fixed 7-bit device address prefix '1010' and three programmable chip-select bits (A2/A1/A0), enabling up to eight devices on one bus. Its internal architecture includes an 8K × 8-bit nonvolatile memory array, 32-byte page write buffer, and address pointer auto-increment logic supporting current-address, random, and sequential read modes.

Write protection is implemented via the WP pin, which-when tied to VCC-disables writes only to addresses 1800h–1FFFh while permitting full read access. The device uses self-timed erase/write cycles with typical 5 ms page write time and supports acknowledge polling to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

24FC64FT-I/OT is supplied in the 8-lead SOT-23 package (5-pin variant per DS22154B-page 5 pin table), with pin 1 = SCL, pin 2 = VSS, pin 3 = SDA, pin 4 = VCC, pin 5 = WP. Address pins A0–A2 are not present in this package; device addressing defaults to 000 for control byte.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC64FT-I/OT, the 24AA64FT-I/OT trades 1 MHz speed for broader legacy compatibility, while the AT24C64D-SSHM-T offers same-speed operation in larger SOIC but removes granular write protection-making 24FC64FT-I/OT optimal for compact, high-reliability industrial designs needing both speed and secure configuration partitioning.

Availability

24FC64FT-I/OT is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering systems, and medical diagnostic equipment requiring stable component supply, long-term data integrity, and low-voltage I²C interoperability.

Supply support for 24FC64FT-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200.

The 24FC64F family was designed for low-power, high-reliability nonvolatile storage in space- and energy-constrained embedded systems-targeting industrial automation, medical instrumentation, and automotive subsystems.

FAQ

What is the maximum I²C clock frequency supported by the 24FC64FT-I/OT?

The 24FC64FT-I/OT supports up to 1 MHz I²C clock frequency when VCC is 2.5 V or higher. At VCC < 2.5 V, the maximum clock drops to 400 kHz. This dual-speed capability allows seamless integration across 1.8 V, 3.3 V, and 5 V platforms while maintaining optimal throughput where voltage permits. The 24FC64FT-I/OT datasheet (DS22154B, Table 1-2) confirms these limits under industrial temperature conditions.

Does the 24FC64FT-I/OT include hardware write protection, and how is it configured?

Yes, the 24FC64FT-I/OT includes hardware write protection for the upper 1/4 memory array (addresses 1800h–1FFFh). Protection is enabled by tying the WP pin to VCC; tying WP to VSS disables protection entirely. The WP state is sampled at the Stop bit of each write command, so toggling WP mid-operation has no effect. This feature is documented in Section 6.3 and Figure 6-1 of the DS22154B datasheet.

What package type is used for the 24FC64FT-I/OT, and are address pins available?

The 24FC64FT-I/OT uses the 5-lead SOT-23 package. Per DS22154B-page 5, this variant omits A0, A1, and A2 address pins-device addressing defaults to binary 000 for the control byte. Pinout is SCL (1), VSS (2), SDA (3), VCC (4), WP (5). This compact footprint suits space-limited PCBs but precludes multi-device bus expansion without external logic.

How many write/erase cycles can the 24FC64FT-I/OT endure, and what is its data retention period?

The 24FC64FT-I/OT guarantees 1,000,000 write/erase cycles and 200 years of data retention at +25°C. These values are specified in Table 1-2 (Parameter 18) and Section 1.0 of the DS22154B datasheet. Endurance is characterized at 25°C and 5.5 V; actual field lifetime may vary with temperature and voltage stress, but the 200-year figure reflects conservative extrapolation under nominal conditions.

Can the 24FC64FT-I/OT operate from a 1.8 V supply, and what are the implications for I²C timing?

Yes, the 24FC64FT-I/OT operates from 1.7 V to 5.5 V, making 1.8 V fully compliant. At 1.8 V (i.e., <2.5 V), the maximum I²C clock frequency is 400 kHz-not 1 MHz-and AC timing parameters such as THIGH, TLOW, and TR scale accordingly (DS22154B, Table 1-2). System designers must configure their I²C master for 400 kHz mode when VCC is below 2.5 V to ensure reliable communication.