Microchip Technology AT24C64W-10SC-2.7

Overview

AT24C64W-10SC-2.7 from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) two-wire serial EEPROM with low-voltage operation (2.7V to 5.5V), 100 kHz I²C bus compatibility, hardware write protection via WP pin, and 32-byte page write capability. It delivers high reliability with 1 million write cycles and 100-year data retention, deployed in industrial control modules for parameter storage and calibration data logging.

For engineers reviewing the AT24C64W-10SC-2.7 datasheet, AT24C64W-10SC-2.7 pinout, AT24C64W-10SC-2.7 application, or AT24C64W-10SC-2.7 equivalent, key selection considerations include its 2.7V–5.5V supply range, 8-pin SOIC package, WP-enabled hardware memory protection, 10 ms max write cycle time, and compatibility with microcontroller I²C peripherals requiring robust nonvolatile configuration storage.

Technical Context

The AT24C64W-10SC-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer and device addressing via A0–A2 pins. Its internal architecture organizes 65,536 bits as 8192 words of 8 bits across 256 pages of 32 bytes each.

It features Schmitt-trigger inputs on SDA/SCL for noise immunity, a programmable write-protect function that inhibits writes to the upper quadrant (16K bits) when WP = VCC, and acknowledge polling support to monitor write completion without fixed delay timing.

Key Specifications

Pinout & Package

AT24C64W-10SC-2.7 is housed in an 8-pin JEDEC SOIC (SOIC-8, package code 8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95640-DW and 24LC64-I/P, the AT24C64W-10SC-2.7 uniquely balances 2.7V operation, hardware WP protection, and sub-µA standby current - making it optimal for battery-powered industrial sensors and medical devices requiring both low-voltage compatibility and secure configuration storage.

Availability

AT24C64W-10SC-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AT24C64W-10SC-2.7 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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on reliability and long-term product support.

The AT24C64W-10SC-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for robust, low-power, I²C-based configuration and calibration storage in industrial, medical, and automotive applications.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64W-10SC-2.7?

The AT24C64W-10SC-2.7 supports up to 100 kHz I²C clock frequency when operated within its 2.7V–5.5V supply range. This is specified in the AC Characteristics table under fSCL for 2.7V/2.5V operation. It does not support 400 kHz mode - that capability is reserved for the 5.0V versions (e.g., AT24C64-10SC). Using >100 kHz may result in unreliable ACK detection or data corruption.

How does the Write Protect (WP) pin function on the AT24C64W-10SC-2.7?

On the AT24C64W-10SC-2.7, the WP pin provides hardware-level write inhibition: when tied to VCC, it blocks write operations to the upper quadrant (16K bits, addresses 0x2000–0x3FFF); when tied to GND, full-memory writes are permitted. If left unconnected, WP is internally pulled down to GND, enabling default write access. This feature protects critical calibration data from accidental overwrite during firmware execution.

What package type is used for the AT24C64W-10SC-2.7?

The AT24C64W-10SC-2.7 uses an 8-pin JEDEC SOIC package (package code 8S1), 0.150" wide, with gull-wing leads and 1.27 mm pitch. This is confirmed in the AT24C64 Ordering Information table on page 12 of the datasheet, where "-10SC" denotes SOIC-8 commercial grade, and "-2.7" specifies the 2.7V–5.5V voltage option.

Does the AT24C64W-10SC-2.7 support page write operations, and what is the page size?

Yes, the AT24C64W-10SC-2.7 supports 32-byte page write operations. Its 64 Kbit memory is organized into 256 pages of 32 bytes each. During a page write, up to 32 consecutive bytes can be written in a single I²C transaction - significantly improving throughput over byte-wise writes. Attempting to cross a 32-byte boundary causes automatic rollover to the start of the same page.

What is the endurance and data retention specification for the AT24C64W-10SC-2.7?

The AT24C64W-10SC-2.7 is rated for 1 million write cycles and 100 years of data retention at +25°C. These values are explicitly stated in the "High Reliability" section of the datasheet and apply to the entire AT24C32/64 family, including this specific variant. Endurance is tested under page-mode conditions at 5.0V and 25°C; retention degrades predictably at elevated temperatures per Arrhenius modeling.