Microchip Technology AT24C128N-10SU-2.7-T

Overview

AT24C128N-10SU-2.7-T from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports up to 1 MHz I²C bus speed at 5V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 40-year data retention. It is commonly used in embedded system configuration storage, sensor calibration data logging, and power meter firmware parameter backup.

For engineers reviewing the AT24C128N-10SU-2.7-T datasheet, AT24C128N-10SU-2.7-T pinout, AT24C128N-10SU-2.7-T application, or AT24C128N-10SU-2.7-T equivalent, key selection considerations include its 8-lead SOIC package, 2.7–5.5V supply range, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with standard I²C controllers in microcontroller-based designs.

Technical Context

The AT24C128N-10SU-2.7-T implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and active-high SCL, supporting cascaded addressing via A0/A1 pins for up to four devices on one bus. Its memory is organized as 256 pages of 64 bytes each, enabling efficient partial-page writes without erasing entire pages.

It uses internal address auto-increment during sequential reads/writes and supports acknowledge polling to detect write completion. The device includes Schmitt-triggered inputs and digital noise filtering on SDA/SCL, ensuring robust operation in electrically noisy industrial environments with VIL/VIH thresholds defined across its full 2.7–5.5V operating range.

Key Specifications

Pinout & Package

AT24C128N-10SU-2.7-T is supplied in an 8-lead JEDEC-standard SOIC package (8S1), measuring 4.90 mm × 3.90 mm × 1.75 mm, with gull-wing leads and RoHS-compliant green finish ("U" suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128N-10SU-2.7-T, the AT24C128B-SSHM-T offers assured 1M-cycle endurance and extended temperature operation without process-letter verification, while the M24128-BWMN6TP provides functional equivalence at lower cost but with reduced write endurance and unspecified high-temp reliability - making the original part optimal for legacy industrial designs already validated with its specific timing and noise-suppression behavior.

Availability

AT24C128N-10SU-2.7-T is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and medical diagnostics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT24C128N-10SU-2.7-T 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 embedded control and connectivity.

The AT24C128N-10SU-2.7-T belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed for reliable, low-power, I²C-based configuration and calibration data storage in industrial, medical, and communications equipment.

FAQ

What is the maximum I²C clock frequency supported by the AT24C128N-10SU-2.7-T?

The AT24C128N-10SU-2.7-T supports up to 1 MHz I²C clock frequency when operated at 5.0V, 400 kHz at 2.7V, and 100 kHz at 1.8V. Since this part is specified for 2.7–5.5V operation, its maximum usable clock rate in typical applications is 1 MHz at 5V or 400 kHz at 3.3V - values confirmed in Table 4 of the official datasheet.

Does the AT24C128N-10SU-2.7-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C128N-10SU-2.7-T requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; 4.7 kΩ is commonly used for 3.3V systems with moderate trace length.

How does the Write Protect (WP) pin function on the AT24C128N-10SU-2.7-T?

The WP pin on the AT24C128N-10SU-2.7-T is an active-high hardware lock: when tied to VCC, all write operations (byte, page, or write-enable) are inhibited; when tied to GND, normal write functionality is enabled. If left floating, it is internally pulled down to GND - but Microchip recommends hardwiring for deterministic behavior.

What is the memory organization of the AT24C128N-10SU-2.7-T?

The AT24C128N-10SU-2.7-T contains 131,072 bits organized as 16,384 words of 8 bits each (16,384 × 8). This equates to 256 pages of 64 bytes each, with random addressing requiring a 14-bit word address - a structure explicitly defined in the Memory Organization section of the datasheet.

Is the AT24C128N-10SU-2.7-T suitable for automotive applications?

No, the AT24C128N-10SU-2.7-T is not qualified for automotive applications. Its datasheet explicitly states that Atmel products "are not suitable for, and shall not be used in, automotive applications" and are not warranted for use in safety-critical or life-support systems. For automotive use, Microchip recommends AEC-Q100-qualified alternatives like the AT24C128D series.