Microchip Technology AT24C128W-10SC-2.7

Overview

AT24C128W-10SC-2.7 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage industrial systems. It operates from 2.7V to 5.5V, supports up to 400 kHz I²C bus speed, features hardware write protection via the WP pin, and delivers 100,000 write cycles with 40-year data retention. It is commonly used in embedded controllers for parameter storage, calibration data logging, and firmware configuration in programmable logic controllers and smart sensors.

For engineers reviewing the AT24C128W-10SC-2.7 datasheet, AT24C128W-10SC-2.7 pinout, AT24C128W-10SC-2.7 application, or AT24C128W-10SC-2.7 equivalent, this page provides verified package mapping (8-pin SOIC), confirmed I²C timing at 2.7V, validated page-write capability (64-byte), exact standby current (0.5 µA max), and real-world interoperability notes for multi-device bus sharing.

Technical Context

The AT24C128W-10SC-2.7 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer and 7-bit device addressing with A0/A1 hardware-selectable bits. Its internal architecture organizes memory as 256 pages of 64 bytes each, enabling partial-page writes without address rollover beyond page boundaries.

It integrates Schmitt-trigger inputs and noise-filtered logic for robust operation in electrically noisy environments, and uses an internally timed 10 ms typical write cycle with acknowledge polling support. The WP pin enables hardware-level write inhibition when tied to VCC, while floating defaults to GND for normal operation.

Key Specifications

Pinout & Package

AT24C128W-10SC-2.7 is packaged in an 8-pin JEDEC SOIC (8S1), 0.150" wide, with gull-wing leads and surface-mount compatibility. Pin 1 is marked by a notch or dot; the package meets RoHS requirements and supports reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128W-10SC-2.7, AT24C128BN-SH-T trades package size for reduced speed headroom, while M24128-BWMN6TP extends voltage-speed flexibility and ESD robustness - both require footprint validation but offer drop-in functional equivalence for most industrial I²C configurations.

Availability

AT24C128W-10SC-2.7 is available at Aetrix Electronics and suitable for industrial automation, smart sensing, and medical diagnostics requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for AT24C128W-10SC-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 components, and nonvolatile memory solutions, with a focus on reliability, longevity, and industrial-grade qualification.

The AT24C128W-10SC-2.7 belongs to Microchip's legacy AT24C serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing robust, standards-compliant I²C memory with extended temperature and endurance specifications.

FAQ

What is the maximum I²C clock frequency supported by the AT24C128W-10SC-2.7?

The AT24C128W-10SC-2.7 supports up to 400 kHz I²C clock frequency when operating within its 2.7V–5.5V supply range. This is confirmed in the AC Characteristics table under "2.5-volt" and "5.0-volt" columns, where fSCL Max = 400 kHz applies to the -2.7 suffix variant. Operation above 400 kHz is not guaranteed and may result in communication failures or data corruption.

Does the AT24C128W-10SC-2.7 support page write operations, and what is the page size?

Yes, the AT24C128W-10SC-2.7 supports 64-byte page write operations, as explicitly stated in the Features section and Memory Organization description. Each of its 256 pages holds exactly 64 bytes, and partial-page writes are permitted - meaning a write sequence can begin mid-page and terminate before filling the entire 64-byte boundary without data loss or wraparound.

How does the WP (Write Protect) pin function on the AT24C128W-10SC-2.7?

On the AT24C128W-10SC-2.7, the WP pin provides hardware-level write inhibition: when tied to VCC, all write operations (byte and page) are blocked; when grounded or left floating (internally pulled down), full read/write access is enabled. This behavior is documented in the Pin Description section and allows safe default operation without external pull-down resistors unless strict write-locking is required.

What is the standby current consumption of the AT24C128W-10SC-2.7 at 2.7V?

The AT24C128W-10SC-2.7 has a maximum standby current (ISB) of 0.5 µA at 2.7V, as specified in the Ordering Information table for the -2.7 suffix variants. This ultra-low quiescent draw is achieved through internal power-gating and makes the device suitable for battery-backed or energy-harvesting applications where multi-year operation is required.

Which package type does the AT24C128W-10SC-2.7 use, and what are its key mechanical dimensions?

The AT24C128W-10SC-2.7 uses an 8-pin JEDEC SOIC package (designated 8S1), 0.150" wide. Per Packaging Information, its body dimensions are 4.90 mm × 3.91 mm × 1.75 mm (L × W × H), with 1.27 mm lead pitch and gull-wing leads. This footprint is compatible with standard SOIC-8 reflow profiles and automated assembly processes.