Microchip Technology AT24C64AN-10SU-2.7

Overview

AT24C64AN-10SU-2.7 from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports 400 kHz I²C bus speed, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention. It is commonly used in embedded systems for configuration storage, calibration data logging, and firmware parameter backup.

For engineers reviewing the AT24C64AN-10SU-2.7 datasheet, AT24C64AN-10SU-2.7 pinout, AT24C64AN-10SU-2.7 application, or AT24C64AN-10SU-2.7 equivalent, key selection considerations include its SOIC-8 package, 2.7V–5.5V supply range, 32-byte page write capability, Schmitt-trigger inputs for noise immunity, and compatibility with standard I²C controllers in microcontroller-based designs.

Technical Context

The AT24C64AN-10SU-2.7 implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and active-high SCL, supporting up to eight devices on a shared bus via A0–A2 address pins. Its internal architecture organizes memory as 256 pages of 32 bytes each, enabling both byte and page write modes with self-timed 5 ms max write cycles.

It uses internal pull-down biasing on floating A0–A2 and WP pins when board coupling is below 3 pF, and includes Schmitt-triggered, filtered inputs for robust operation in electrically noisy environments. The device enters low-power standby mode (<2 µA at 2.7V) after STOP condition receipt and supports acknowledge polling for write-cycle completion detection.

Key Specifications

Pinout & Package

AT24C64AN-10SU-2.7 is supplied in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads, RoHS-compliant lead finish. Dimensions: 4.80–5.00 mm width × 3.81–3.99 mm depth × ≤1.75 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D-SSHM-T and M24C64-WMN6TP, the AT24C64AN-10SU-2.7 offers optimal balance of industrial temperature support, I²C interoperability, and cost-effectiveness for general-purpose configuration storage - without requiring PCB changes or firmware adaptation.

Availability

AT24C64AN-10SU-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer device configuration, and power supply firmware parameter storage requiring stable component supply and long-term obsolescence management.

Supply support for AT24C64AN-10SU-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 memory solutions, with a focus on embedded control and connectivity.

The AT24C64AN-10SU-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space-constrained industrial and commercial systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64AN-10SU-2.7?

The AT24C64AN-10SU-2.7 supports a maximum I²C clock frequency of 400 kHz across its full 2.7V–5.5V supply range and operating temperature (–40°C to +85°C). This complies with the Fast-mode I²C specification and ensures timing margin for reliable communication with standard microcontroller I²C peripherals. The device does not support High-speed mode (3.4 MHz) or SMBus-specific timing.

Does the AT24C64AN-10SU-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C64AN-10SU-2.7 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 1.8 kΩ to 10 kΩ depending on bus capacitance and speed; 4.7 kΩ is commonly used for 400 kHz operation with moderate trace length. No internal pull-ups are provided.

How many devices can share the same I²C bus with the AT24C64AN-10SU-2.7?

Up to eight AT24C64AN-10SU-2.7 devices can share a single I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit hardware addresses (0x50–0x57). All devices must use distinct combinations of these pins; floating pins default to logic low due to internal biasing, so explicit hardwiring is recommended for deterministic addressing.

What is the write endurance and data retention specification for the AT24C64AN-10SU-2.7?

The AT24C64AN-10SU-2.7 is rated for 1 million write cycles per memory location and guarantees 100 years of data retention at +25°C. Retention decreases logarithmically with temperature - e.g., ~30 years at +85°C - but remains sufficient for industrial equipment lifetimes. Endurance applies to both byte and page write modes.

Can the AT24C64AN-10SU-2.7 operate at 1.8V?

No, the AT24C64AN-10SU-2.7 is specified only for 2.7V to 5.5V operation, as indicated by the "–2.7" suffix in its part number. For 1.8V–5.5V operation, Microchip offers the AT24C64AN-10SU-1.8 variant. Using the –2.7 version below 2.7V may result in unreliable reads/writes or failure to acknowledge I²C transactions.