Microchip Technology 24LC64F-E/SN

Overview

24LC64F-E/SN from Microchip Technology Inc. is a 64 Kbit I²C-compatible serial EEPROM organized as 8K × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz max clock frequency and industrial/automotive temperature range (–40°C to +125°C). It features hardware write-protect for the upper 1/4 array (1800h–1FFFh), 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in automotive body control modules, industrial sensor nodes, and embedded system configuration storage.

For engineers reviewing the 24LC64F-E/SN datasheet, 24LC64F-E/SN pinout, 24LC64F-E/SN application, or 24LC64F-E/SN equivalent, key selection considerations include its 2.5V minimum VCC, E-grade automotive qualification, quarter-array WP functionality, and compatibility with standard I²C master controllers requiring low-power nonvolatile memory with deterministic write timing.

Technical Context

The 24LC64F-E/SN implements a two-wire I²C interface with slave-only operation, supporting standard-mode (100 kHz) and fast-mode (400 kHz) signaling depending on VCC level. Its internal address counter enables current-address, random, and sequential read modes, while the 32-byte page buffer allows burst writes within physical page boundaries (0000h–001Fh, 0020h–003Fh, etc.).

Write protection is implemented via the WP pin, which-when tied to VCC-disables writes only to addresses 1800h–1FFFh; all other locations remain writable. Acknowledge polling is supported to detect write cycle completion without fixed delay timing, improving bus efficiency in time-critical systems.

Key Specifications

Pinout & Package

24LC64F-E/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150 mil body width, RoHS-compliant matte tin finish, and JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC64F-E/SN, the 24AA64F-I/SN trades automotive qualification for ultra-low-voltage operation, while the AT24C64D-SSHM-T sacrifices E-grade reliability for faster clocking and simplified write-protection scope - making 24LC64F-E/SN optimal for safety-critical automotive configurations requiring guaranteed 125°C operation and granular 1/4-array lock.

Availability

24LC64F-E/SN is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor nodes, and medical infusion pumps requiring stable component supply with long-term lifecycle assurance.

Supply support for 24LC64F-E/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.

The 24LC64F-E/SN belongs to Microchip's 24XX64F family of I²C EEPROMs, designed specifically for automotive and industrial systems demanding high reliability, extended temperature operation, and hardware-level data protection.

FAQ

What is the minimum supply voltage required for 24LC64F-E/SN operation?

The 24LC64F-E/SN requires a minimum VCC of 2.5V, as specified in the Device Selection Table and Electrical Characteristics section. This distinguishes it from the 24AA64F (1.7V min) and 24FC64F (1.7V min) variants. Operating below 2.5V may result in undefined behavior or failure to respond on the I²C bus. The 24LC64F-E/SN datasheet explicitly states "2.5–5.5V" for VCC range and confirms 400 kHz operation only at VCC ≥ 2.5V.

Does 24LC64F-E/SN support 1 MHz I²C clock frequency?

No, the 24LC64F-E/SN does not support 1 MHz I²C operation. Its maximum clock frequency is 400 kHz at VCC ≥ 2.5V, as confirmed in the Device Selection Table and AC Characteristics tables. The 1 MHz capability is exclusive to the 24FC64F variant. Attempting 1 MHz communication with 24LC64F-E/SN will violate timing specifications including THIGH, TLOW, and TR, leading to bus errors or failed acknowledgments.

How does the write-protect (WP) pin function on 24LC64F-E/SN?

The WP pin on 24LC64F-E/SN enables hardware write-protection for the upper 1/4 of memory (addresses 1800h–1FFFh) when pulled high to VCC. Writes to this region are inhibited, but reads remain fully functional. When WP is tied to VSS, full-array write access is enabled. The pin is sampled at the Stop bit of each write command, and toggling WP after the Stop has no effect on an ongoing write cycle. This behavior is documented in Section 2.4 and Figure 6-2 of the datasheet.

What package type is used for 24LC64F-E/SN?

The 24LC64F-E/SN uses an 8-lead SOIC (Small Outline Integrated Circuit) package with 150 mil body width, as indicated by the "SN" suffix in the part number and confirmed in Section 9.1 (Package Marking Information) and the Package Types diagram on page 2 of DS22154B. This package is RoHS-compliant, features matte tin (Sn) plating, and follows JEDEC MS-012AC mechanical dimensions.

Can multiple 24LC64F-E/SN devices share the same I²C bus?

Yes, up to eight 24LC64F-E/SN devices can operate on the same I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit slave addresses (0x50–0x57). These pins must be hard-wired to VSS or VCC - they are not internally terminated and cannot float. The SOT-23 variant lacks these pins, but 24LC64F-E/SN (SOIC) fully supports multi-device addressing as described in Section 5.0 and Figure 5-1 of the datasheet.