Microchip Technology AT24C128N-10SC

Overview

AT24C128N-10SC from Microchip Technology (formerly Atmel) is a 128K-bit (16,384 × 8) two-wire serial EEPROM with 2.7V to 5.5V supply operation, 400 kHz I²C bus interface, 64-byte page write capability, and hardware write protection via the WP pin. It operates across industrial temperature range (−40°C to +85°C) in an 8-pin SOIC package and is used for nonvolatile parameter storage in embedded controllers, power supplies, and sensor calibration modules.

For engineers reviewing the AT24C128N-10SC datasheet, AT24C128N-10SC pinout, AT24C128N-10SC application, or AT24C128N-10SC equivalent, key selection criteria include its 2.7–5.5V operating range, 400 kHz I²C speed at 2.7V, 10 ms max write cycle time, industrial temperature rating, and SOIC-8 packaging compatibility with legacy board layouts.

Technical Context

The AT24C128N-10SC implements a standard I²C-compatible two-wire interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. It supports cascaded multi-device bus configurations using A0/A1 address pins, enabling up to four devices on a shared bus.

Internally organized as 256 pages of 64 bytes each, it supports byte-write and partial/complete page-write operations with automatic address incrementing within a page. Write protection is enforced via the dedicated WP pin, which disables all writes when pulled high to VCC.

Key Specifications

Pinout & Package

AT24C128N-10SC is housed in an 8-pin JEDEC SOIC (8S1) package measuring 4.90 mm × 3.90 mm × 1.75 mm, with gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a notch or dot; the package is RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128N-10SC, AT24C128B-SSHL-T trades SOIC mechanical stability for compact TSSOP footprint, while M24128-BWMN6TP extends temperature and ESD margins at the cost of minor timing variations in acknowledge polling-both require layout or firmware validation before substitution.

Availability

AT24C128N-10SC is available at Aetrix Electronics and suitable for industrial power supplies, smart sensor modules, embedded controller configuration, and network equipment identity management requiring stable component supply and long-term obsolescence support.

Supply support for AT24C128N-10SC 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 reliability, longevity, and industrial-grade qualification.

The AT24C128N-10SC belongs to Microchip's legacy AT24C serial EEPROM family, designed specifically for low-power, low-voltage embedded systems requiring robust, field-programmable nonvolatile storage with minimal pin count and board area.

FAQ

What is the maximum I²C clock frequency supported by the AT24C128N-10SC?

The AT24C128N-10SC supports up to 400 kHz I²C communication when operated at 2.7V to 5.5V. This is specified in the AC Characteristics table under fSCL (Clock Frequency, SCL) with "2.5-volt" and "5.0-volt" columns showing 400 kHz and 1000 kHz respectively-but the -10SC suffix denotes the 10 ms write-cycle variant optimized for 400 kHz at 2.7V. The device remains fully functional at lower speeds (100 kHz) for legacy system compatibility.

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

Yes, the AT24C128N-10SC requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is Schmitt-triggered input only. Typical values range from 2.2 kΩ to 10 kΩ to VCC, selected based on bus capacitance and desired rise time. The absence of internal pull-ups means omission will result in complete I²C bus failure.

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

On the AT24C128N-10SC, the WP pin is active-high: when tied to VCC, all write operations-including byte, page, and erase-are inhibited. When tied to GND or left floating (internally pulled down), full read/write access is enabled. This hardware-level protection operates independently of software commands and cannot be overridden by I²C transactions, making it ideal for safeguarding critical configuration data post-deployment.

What package type is used for the AT24C128N-10SC?

The AT24C128N-10SC uses an 8-pin JEDEC-standard SOIC package (designated 8S1), measuring 4.90 mm × 3.90 mm × 1.75 mm with 1.27 mm lead pitch. This is confirmed in the Ordering Information table, where "AT24C128N-10SC" maps to package code "8S1", and matches the mechanical drawings labeled "8S1, 8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)".

Can multiple AT24C128N-10SC devices share the same I²C bus?

Yes, up to four AT24C128N-10SC devices can share a single I²C bus using hardware address configuration via the A0 and A1 pins. Each device responds to a unique 7-bit slave address (0x50–0x53) determined by the logic states of A0/A1. No additional arbitration or protocol modification is needed-the standard I²C addressing scheme handles collision-free communication automatically.