Microchip Technology AT24C64A-10TU-2.7

Overview

AT24C64A-10TU-2.7 from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) two-wire serial EEPROM with I²C-compatible interface, operating from 2.7V to 5.5V, featuring 32-byte page write capability, hardware write protection via WP pin, and 1 million write cycles endurance. It is used for nonvolatile parameter storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT24C64A-10TU-2.7 datasheet, AT24C64A-10TU-2.7 pinout, AT24C64A-10TU-2.7 application, or AT24C64A-10TU-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5V), TSSOP-8 package footprint, 400 kHz I²C speed support, WP-enabled hardware data lock, and industrial temperature rating (–40°C to +85°C).

Technical Context

The AT24C64A-10TU-2.7 implements a standard two-wire (I²C) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. It supports cascaded bus operation with up to eight devices using A0–A2 address pins and uses open-drain bidirectional SDA with external pull-up.

Internally organized as 256 pages of 32 bytes each, it executes self-timed write cycles (≤5 ms), supports byte and page writes, and enters low-power standby mode (ISB = 2.0 µA at VCC = 2.7V) after STOP condition or power-up.

Key Specifications

Pinout & Package

AT24C64A-10TU-2.7 is housed in an 8-lead TSSOP package (4.4 mm body width, JEDEC MO-153 compliant), with gull-wing leads and RoHS-compliant green finish ("U" suffix). Pin 1 is marked by a corner notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64A-10TU-2.7, AT24C64C-SSHM-T offers tighter write timing and wider voltage range for future-proofing, while BR24G64FJ-WE2 delivers faster communication and lower standby draw-both require validation of WP behavior and timing margins in target systems.

Availability

AT24C64A-10TU-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and embedded controller bootloader settings requiring stable component supply and long-term lifecycle support.

Supply support for AT24C64A-10TU-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 broad industrial and automotive qualification capabilities.

The AT24C64A-10TU-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM product line, designed specifically for reliable, low-power, I²C-based configuration and calibration data storage in space-constrained industrial and commercial systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64A-10TU-2.7?

The AT24C64A-10TU-2.7 supports up to 400 kHz I²C clock frequency across its full operating voltage range (2.7V–5.5V) and temperature range (–40°C to +85°C), meeting Fast-mode I²C specifications. This is confirmed in Table 4 of the official datasheet (3054T–SEEPR–1/07), where fSCL min is specified as 400 kHz with defined tLOW, tHIGH, and other timing parameters.

Does the AT24C64A-10TU-2.7 support single-byte and page-write operations?

Yes, the AT24C64A-10TU-2.7 supports both byte-write and 32-byte page-write modes. Page writes allow up to 32 sequential bytes to be written in a single I²C transaction, improving efficiency over individual byte writes. The device automatically handles address incrementing within the 32-byte page boundary, and rollover occurs at page end. This is documented in the "Write Operations" section of the datasheet.

What is the function of the WP pin on the AT24C64A-10TU-2.7?

The WP (Write Protect) pin on the AT24C64A-10TU-2.7 provides hardware-level write inhibition. When WP is driven high to VCC, all write operations-including byte, page, and erase-are blocked. When WP is low or floating (internally pulled down if board coupling <3 pF), normal write functionality is enabled. This feature safeguards critical configuration data from unintended modification.

What package type is used for the AT24C64A-10TU-2.7?

The AT24C64A-10TU-2.7 uses an 8-lead TSSOP package (designated "8A2" in Microchip's ordering guide), with 4.4 mm body width, gull-wing leads, and RoHS-compliant green finish. The "TU" in the part number explicitly denotes TSSOP packaging, and mechanical dimensions conform to JEDEC MO-153, Variation AA.

What is the endurance and data retention specification for the AT24C64A-10TU-2.7?

The AT24C64A-10TU-2.7 guarantees 1 million write cycles per memory location and 100 years of data retention at +25°C. These values are characterized and specified in the "Features" section and Table 6 of the datasheet (3054T–SEEPR–1/07). Retention decreases logarithmically with temperature-e.g., ~30 years at +85°C-but remains well within industrial requirements.