Microchip Technology AT24C128N-10SI-2.7

Overview

AT24C128N-10SI-2.7 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM with low-voltage operation (2.7V to 5.5V), 400 kHz I²C bus compatibility at 2.7V, and industrial temperature range (−40°C to +85°C). It features hardware write protection via the WP pin, 64-byte page write capability, and 100,000 write cycles endurance - deployed in embedded systems requiring nonvolatile parameter storage under constrained power and space.

For engineers reviewing the AT24C128N-10SI-2.7 datasheet, AT24C128N-10SI-2.7 pinout, AT24C128N-10SI-2.7 application, or AT24C128N-10SI-2.7 equivalent, key selection criteria include VCC operating range (2.7–5.5 V), I²C clock frequency (400 kHz max at 2.7 V), industrial-grade temperature rating, 8-pin SOIC package (8S1), and hardware/software write protection implementation using the WP pin.

Technical Context

The AT24C128N-10SI-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal address counter supports current-address, random-address, and sequential read modes, while page-write logic enables burst writes up to 64 bytes without rollover across pages.

Device addressing uses A0 and A1 pins to support up to four devices on a shared bus; unconnected pins default to logic low. Write protection is enforced by tying WP high (VCC) to inhibit all writes, or leaving it floating (internally pulled down) for normal operation - enabling both hardware and software-controlled data security.

Key Specifications

Pinout & Package

AT24C128N-10SI-2.7 is housed in an 8-pin JEDEC SOIC package (8S1), 0.150" wide, with standard gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a notch or dot; device orientation follows JEDEC MS-012AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128B-SSHM-T and BR24G128FJ-WE2, the AT24C128N-10SI-2.7 delivers guaranteed 400 kHz I²C performance at 2.7 V in a widely supported 8-pin SOIC package, making it optimal for industrial and medical systems needing proven interoperability, moderate board area, and strict low-voltage timing compliance.

Availability

AT24C128N-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for AT24C128N-10SI-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 coverage.

The AT24C128N-10SI-2.7 belongs to Microchip's AT24C serial EEPROM product line, designed specifically for reliable, low-power, I²C-based parameter storage in space- and power-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C128N-10SI-2.7 at 2.7 V?

The AT24C128N-10SI-2.7 supports up to 400 kHz I²C clock frequency when operated at 2.7 V, as specified in its AC characteristics table. This is lower than the 1 MHz maximum achievable at 5 V, reflecting timing margin adjustments for reduced supply voltage - critical for ensuring reliable communication in 3.3 V industrial systems where noise margins are tighter.

How does the WP pin function on AT24C128N-10SI-2.7?

The WP (Write Protect) pin on AT24C128N-10SI-2.7 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 dual-mode behavior allows both permanent protection (hardwired VCC) and dynamic control (MCU-driven logic level), enhancing security in safety-critical AT24C128N-10SI-2.7 deployments.

What package type is used for AT24C128N-10SI-2.7?

AT24C128N-10SI-2.7 uses an 8-pin JEDEC SOIC package (designated 8S1), 0.150" wide, with gull-wing leads and 1.27 mm pitch. This industry-standard package ensures compatibility with automated assembly processes and widely available socketing solutions, simplifying prototyping and high-volume manufacturing of AT24C128N-10SI-2.7-based designs.

Can AT24C128N-10SI-2.7 be used alongside other AT24C devices on the same I²C bus?

Yes - AT24C128N-10SI-2.7 supports cascading up to four devices on a single I²C bus using its A0 and A1 address pins. These pins configure the device's 3-bit I²C address (bits 4–2), allowing unique addressing within the 0x50–0x53 range. This capability enables modular system design where multiple AT24C128N-10SI-2.7 units store distinct subsystem parameters without bus contention.

What is the data retention period for AT24C128N-10SI-2.7 at 85°C?

AT24C128N-10SI-2.7 guarantees 40 years of data retention at +85°C, as confirmed in its DC characteristics table. This specification reflects worst-case accelerated testing and ensures long-term integrity of stored calibration data, serial numbers, or security keys in thermally stressed environments - a key requirement for AT24C128N-10SI-2.7 applications in industrial and automotive systems.