Microchip Technology 24FC64FT-I/SN

Overview

24FC64FT-I/SN 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 quarter 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/SN datasheet, 24FC64FT-I/SN pinout, 24FC64FT-I/SN application, or 24FC64FT-I/SN equivalent, key selection criteria include its 1 MHz I²C speed at V_CC ≥ 2.5 V, low 1 µA standby current, TSSOP-8 package compatibility, and quarter-array hardware write-protect functionality.

Technical Context

The 24FC64FT-I/SN implements a standard two-wire 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 EEPROM array, 32-byte page write buffer, and address pointer auto-increment logic for sequential read/write operations.

Write protection is implemented via the WP pin, which-when tied to V_CC-inhibits 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/SN is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and Pb-free. Pin functions are electrically identical across SOIC, PDIP, MSOP, and TDFN variants but differ from the 5-lead SOT-23 variant (which omits A0–A2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA64FT-I/SN, the 24FC64FT-I/SN delivers 2.5× higher I²C bandwidth and identical low-voltage operation, while AT24C64D offers comparable speed but lacks dedicated hardware write-protect for critical memory segments-making 24FC64FT-I/SN optimal for safety- or security-sensitive configurations.

Availability

24FC64FT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system boot configuration, and smart meter firmware parameter backup requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24FC64FT-I/SN 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The 24FC64F family was designed specifically for low-power, high-reliability nonvolatile data storage in space- and energy-constrained embedded systems-emphasizing fast I²C throughput, extended voltage range, and hardware-assisted data integrity.

FAQ

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

The 24FC64FT-I/SN supports up to 1 MHz I²C clock frequency when V_CC is 2.5 V or higher. At V_CC between 1.7 V and 2.5 V, the maximum clock rate drops to 400 kHz. This dual-speed capability allows seamless integration across 1.8 V, 3.3 V, and 5 V systems while maintaining optimal performance in each domain. The 24FC64FT-I/SN datasheet specifies precise timing parameters-including THIGH, TLOW, and TSU:DAT-for both conditions.

How does the hardware write-protect feature work on the 24FC64FT-I/SN?

The 24FC64FT-I/SN's WP pin enables hardware write-protection for the upper quarter of the memory array (addresses 1800h–1FFFh). When WP is tied to V_CC, write commands to that region are ignored-though reads remain fully functional. The protection is sampled at the Stop bit of each write command, making it immune to mid-cycle toggling. This eliminates reliance on software locks and prevents corruption of critical firmware or security keys stored in the protected zone.

What package type is used for the 24FC64FT-I/SN?

The 24FC64FT-I/SN is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 3.0 mm × 4.4 mm body dimensions and 0.65 mm lead pitch. It is RoHS-compliant and Pb-free, marked with "4F64FT" and temperature grade "I" per Microchip's standard marking convention. This package offers superior thermal performance and board-space efficiency compared to PDIP or SOIC, while maintaining pin compatibility with other 8-lead variants in the 24XX64F family.

Can multiple 24FC64FT-I/SN devices share the same I²C bus?

Yes-up to eight 24FC64FT-I/SN devices can operate on a single I²C bus using the A2, A1, and A0 address pins to configure unique 7-bit slave addresses. Each pin must be hardwired to V_SS or V_CC to set its logic state. The resulting address uses the fixed prefix '1010' followed by the A2–A0 bits, enabling full 512 Kbit address space expansion. Note that the SOT-23 variant lacks these pins and supports only a fixed address.

What is the endurance and data retention specification for the 24FC64FT-I/SN?

The 24FC64FT-I/SN guarantees more than one million erase/write cycles per memory location and greater than 200 years of data retention at +85°C ambient temperature. These specifications are validated per JEDEC standards and reflect worst-case conditions-actual field performance typically exceeds these values. Endurance is uniform across the entire 8K × 8-bit array, including pages accessed via the 32-byte buffer, and applies under recommended operating conditions (V_CC = 1.7–5.5 V, T_A = –40°C to +85°C).