Microchip Technology AT24C64W-10SC

Overview

AT24C64W-10SC from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) I²C-compatible serial EEPROM optimized for low-voltage industrial and embedded systems. It operates from 2.7V to 5.5V, supports 100 kHz I²C bus speed at 2.7V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention. It is commonly used in set-top boxes for configuration storage and calibration data backup.

For engineers reviewing the AT24C64W-10SC datasheet, AT24C64W-10SC pinout, AT24C64W-10SC application, or AT24C64W-10SC equivalent, key selection considerations include its 2.7V–5.5V supply range, 32-byte page write capability, Schmitt-triggered inputs for noise immunity, and compatibility with standard I²C controllers in space-constrained designs.

Technical Context

The AT24C64W-10SC implements a two-wire (I²C) serial interface with open-drain SDA and input-clocked SCL, supporting bidirectional data transfer and device addressing via A0–A2 pins. Its internal architecture organizes memory as 256 pages of 32 bytes each, enabling partial-page writes without erasing full pages.

It integrates a low-power standby mode (ISB ≤ 0.5 µA at 2.7V), on-chip voltage detection for noise resilience, and hardware write protection that disables writes to the upper quadrant (16K bits) when WP = VCC. The device uses an internally timed 10 ms max write cycle and supports acknowledge polling for host synchronization.

Key Specifications

Pinout & Package

AT24C64W-10SC is supplied in an 8-pin JEDEC SOIC package (package code 8S1), measuring 3.90 mm × 4.90 mm × 1.75 mm, with gull-wing leads and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C64-WMN6TP and CAT24C64WI-GT3, the AT24C64W-10SC provides tighter standby current (0.5 µA) at 2.7V and guaranteed 100 kHz operation across its full voltage range - making it optimal for cost-sensitive commercial-grade embedded systems with strict power budgets.

Availability

AT24C64W-10SC is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and set-top box user preferences requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for AT24C64W-10SC 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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT24Cxx EEPROM family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.

The AT24C64W-10SC belongs to Microchip's legacy serial EEPROM product line, designed specifically for robust, low-power, I²C-based nonvolatile data storage in resource-constrained embedded systems where endurance and data integrity are critical.

FAQ

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

The AT24C64W-10SC supports up to 100 kHz I²C clock frequency when operating at 2.7V–5.5V. This is confirmed in the AC Characteristics table under fSCL for the "2.7-, 2.5-volt" column. While some 5V-only variants of the AT24C64 family support 400 kHz, the AT24C64W-10SC variant is specified strictly for 100 kHz across its entire voltage range.

Does the AT24C64W-10SC support partial page writes?

Yes, the AT24C64W-10SC supports partial page writes. Its 32-byte page write mode allows writing 1 to 32 bytes per transaction, with automatic internal address incrementing. The device does not require full-page alignment, enabling efficient updates of scattered configuration fields without overwriting adjacent data in the AT24C64W-10SC memory array.

What is the function of the WP pin on the AT24C64W-10SC?

The WP (Write Protect) pin on the AT24C64W-10SC provides hardware-level write inhibition. When pulled high to VCC, it disables write operations to the upper quadrant (16K bits) of memory. When grounded, full write access is enabled. If left unconnected, an internal pull-down ensures default write-enable behavior in the AT24C64W-10SC.

What is the endurance rating of the AT24C64W-10SC?

The AT24C64W-10SC is rated for 1 million write cycles per memory location, as specified in the DC Characteristics table under Endurance. This applies to both byte and page write modes at 25°C and is validated across the full 2.7V–5.5V supply range - ensuring long-term reliability in applications like medical device logging or industrial calibration storage using the AT24C64W-10SC.

Is the AT24C64W-10SC compatible with standard I²C controllers?

Yes, the AT24C64W-10SC is fully compliant with the standard I²C protocol, including START/STOP conditions, ACK/NACK handshaking, and 7-bit device addressing with R/W bit. Its open-drain SDA/SCL pins, Schmitt-trigger inputs, and noise-suppressed timing meet I²C specification requirements - enabling plug-and-play integration with any standard I²C master controller interfacing to the AT24C64W-10SC.