Microchip Technology 24FC64F-I/SN

Overview

24FC64F-I/SN from Microchip Technology Inc. is a 64 Kbit I²C-compatible serial EEPROM organized as 8K × 8-bit, operating from 1.7V to 5.5V with 1 MHz max clock frequency (at V_CC ≥ 2.5V), 32-byte page write buffer, and hardware write-protect for upper 1/4 array (1800h–1FFFh). It targets low-power embedded systems requiring nonvolatile storage for configuration data, calibration parameters, or event logs.

For engineers reviewing the 24FC64F-I/SN datasheet, 24FC64F-I/SN pinout, 24FC64F-I/SN application, or 24FC64F-I/SN equivalent, key selection criteria include its 1 MHz I²C speed at 1.7V+, industrial temperature range (−40°C to +85°C), SOT-23-5 package footprint, and quarter-array write-protection capability.

Technical Context

The 24FC64F-I/SN implements a two-wire I²C interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and internal address pointer auto-increment for sequential reads. Its control logic supports byte and page write modes, acknowledge polling during write cycles, and hardware-based write protection tied to the WP pin state.

It uses CMOS EEPROM technology with self-timed erase/write cycles, 1 μA max standby current (I-temp), and 400 μA max read current. The device requires no external high-voltage programming and supports up to eight devices on a single bus via A0–A2 address pins - though those pins are omitted in the SOT-23-5 package variant.

Key Specifications

Pinout & Package

24FC64F-I/SN is supplied in a Pb-free, RoHS-compliant 5-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for high-density PCB layouts. Unlike 8-lead variants, this version omits A0–A2 address pins and supports only a fixed slave address (1010000b).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC64F-I/SN, the 24AA64F-I/SN offers identical packaging and voltage range but sacrifices 1 MHz throughput, while the AT24C64D-SSHM-T trades SOT-23 compactness for SOIC-8 compatibility and removes the dedicated quarter-array write-protect feature - making the 24FC64F-I/SN optimal for new space-constrained designs needing fast, secure, and self-contained nonvolatile storage.

Availability

24FC64F-I/SN is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC modules, medical diagnostic sensors, and automotive body controllers requiring stable component supply across extended product lifecycles.

Supply support for 24FC64F-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, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24XX64F family was designed specifically for low-voltage, low-power embedded systems requiring reliable, pin-efficient nonvolatile memory - emphasizing robust I²C interoperability, extended temperature operation, and hardware-level data protection.

FAQ

What is the maximum I²C clock frequency supported by the 24FC64F-I/SN?

The 24FC64F-I/SN supports up to 1 MHz I²C clock frequency when V_CC is 2.5V or higher. At supply voltages between 1.7V and 2.5V, the maximum clock rate drops to 400 kHz. This dual-speed capability ensures compatibility with both legacy 400 kHz systems and newer high-throughput designs, and is explicitly defined in the DS22154B datasheet AC characteristics table.

Does the 24FC64F-I/SN include hardware write protection, and how is it implemented?

Yes, the 24FC64F-I/SN includes hardware write protection for the upper 1/4 of its memory array (addresses 1800h–1FFFh) via the WP pin. When WP is tied to V_CC, writes to that region are inhibited while reads remain fully functional. This protection is sampled at the Stop bit of each write command and does not require software configuration - a key differentiator from register-based protection schemes found in other EEPROM families.

What package type is used for the 24FC64F-I/SN, and what are its key mechanical features?

The 24FC64F-I/SN uses a 5-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), which omits the A0–A2 address pins present in 8-lead variants. It is Pb-free and RoHS-compliant, with gull-wing leads suitable for standard reflow soldering. The compact footprint makes it ideal for space-constrained applications such as wearable medical devices or automotive interior modules where board area is at a premium.

How many erase/write cycles can the 24FC64F-I/SN endure, and what is its data retention specification?

The 24FC64F-I/SN guarantees a minimum of 1,000,000 erase/write cycles and greater than 200 years of data retention at +85°C ambient temperature. These specifications are validated per JEDEC standards and reflect actual measured performance - not extrapolated estimates - enabling confident use in industrial and automotive applications where long-term reliability is mandatory.

Can multiple 24FC64F-I/SN devices be connected on the same I²C bus?

No, the 24FC64F-I/SN in the SOT-23-5 package does not support multi-device addressing because it lacks A0, A1, and A2 address input pins. It uses a fixed I²C slave address (1010000b). To connect multiple devices on one bus, engineers must select the 8-lead versions (e.g., 24FC64F-I/P or 24FC64F-I/SM) which provide three configurable address bits for up to eight unique addresses.