Microchip Technology AT24C128N-10SU-1.8

Overview

AT24C128N-10SU-1.8 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 3.6 V, supports 100 kHz I²C bus speed at 1.8 V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 40-year data retention - used in industrial sensor calibration storage and power meter firmware parameter backup.

For engineers reviewing the AT24C128N-10SU-1.8 datasheet, AT24C128N-10SU-1.8 pinout, AT24C128N-10SU-1.8 application, or AT24C128N-10SU-1.8 equivalent, key selection considerations include its 1.8 V operation range, 64-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with standard I²C controllers in space-constrained industrial modules.

Technical Context

The AT24C128N-10SU-1.8 implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and edge-triggered SCL, supporting cascaded addressing via A0/A1 pins for up to four devices on one bus. Its internal architecture organizes memory as 256 pages of 64 bytes each, enabling partial-page writes without rollover within the same page boundary.

It uses an internal proprietary bias circuit on A0, A1, and WP pins to pull them low when floating (if capacitive coupling to VCC plane is <3 pF), ensuring deterministic behavior in unconnected configurations. The device enters low-power standby mode after STOP condition receipt and supports acknowledge polling to detect write cycle completion.

Key Specifications

Pinout & Package

AT24C128N-10SU-1.8 is packaged in an 8-lead SOIC (JEDEC SOIC, package code 8S1), 3.9 mm × 4.9 mm body, green RoHS-compliant lead-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128N-10SU-1.8, AT24C128B-SSHM-T offers longer-term availability and enhanced robustness but requires design review for I²C timing at 1.8 V, while M24128-BWMN6TP provides true pinout compatibility with minor firmware adaptation for WP polarity - both retain identical memory organization and endurance.

Availability

AT24C128N-10SU-1.8 is available at Aetrix Electronics and suitable for smart energy metering, industrial sensor calibration, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT24C128N-10SU-1.8 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 delivering microcontrollers, analog components, and memory solutions for embedded control applications.

The AT24C128N-10SU-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-voltage nonvolatile data storage in industrial, metering, and consumer systems where write endurance and data retention are critical.

FAQ

What is the maximum I²C clock frequency supported by AT24C128N-10SU-1.8 at 1.8 V?

The AT24C128N-10SU-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is specified in Table 4 (AC Characteristics – Industrial Temperatures) and reflects the reduced slew rate and timing margins inherent to low-voltage operation. Higher frequencies (400 kHz or 1 MHz) require ≥2.5 V supply per datasheet limits.

Does AT24C128N-10SU-1.8 support page write operations, and what is the page size?

Yes, AT24C128N-10SU-1.8 supports 64-byte page write operations. The memory is internally organized into 256 pages of 64 bytes each. Page writes allow up to 64 sequential bytes to be written in a single I²C transaction, significantly improving throughput over byte-write mode. Partial page writes are permitted, and address roll-over occurs within the same page boundary.

How does the Write Protect (WP) pin function on AT24C128N-10SU-1.8?

The WP pin on AT24C128N-10SU-1.8 is an active-high hardware write protection input. When WP is tied to VCC, all write operations (byte and page) are inhibited. When WP is grounded, normal write functionality is enabled. If left floating, the pin is internally pulled down (for coupling <3 pF), defaulting to write-enabled - though Microchip recommends hardwiring for deterministic behavior.

What is the endurance and data retention specification for AT24C128N-10SU-1.8?

AT24C128N-10SU-1.8 guarantees 1,000,000 write cycles and 40 years of data retention at +25 °C. These values are confirmed in Tables 4 and 5 (AC Characteristics) and apply to devices bearing the "B" process letter - which AT24C128N-10SU-1.8 qualifies for per ordering information and revision notes in the datasheet.

Is AT24C128N-10SU-1.8 pin-compatible with AT24C128B-SSHM-T?

No, AT24C128N-10SU-1.8 is not pin-compatible with AT24C128B-SSHM-T in terms of guaranteed drop-in replacement. While both use SOIC-8 packages and share identical pin functions (A0, A1, WP, SCL, SDA, VCC, GND, NC), AT24C128B-SSHM-T is a newer generation with revised internal timing and qualification - Microchip explicitly states AT24C128N-10SU-1.8 is "not recommended for new design" and directs users to the B-series datasheet for updated specs and layout guidance.