Microchip Technology AT24C128-10TU-2.7

Overview

AT24C128-10TU-2.7 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 400 kHz I²C bus speed at 2.7V, features hardware write protection via 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 AT24C128-10TU-2.7 datasheet, AT24C128-10TU-2.7 pinout, AT24C128-10TU-2.7 application, or AT24C128-10TU-2.7 equivalent, key selection considerations include its TSSOP-8 package, 2.7–5.5 V supply range, 400 kHz I²C timing at 2.7 V, 64-byte page write capability, and hardware write-protect functionality - all critical for robust, space-constrained industrial designs.

Technical Context

The AT24C128-10TU-2.7 implements a standard two-wire (I²C-compatible) 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 efficient partial-page writes without address rollover across pages.

It uses Schmitt-trigger inputs with noise filtering on SCL/SDA, supports acknowledge polling during write cycles, and incorporates internal pull-down biasing on floating A0, A1, and WP pins when board coupling is below 3 pF. The device complies with I²C-bus specification timing requirements for 400 kHz operation at 2.7 V and meets extended industrial temperature range (–40°C to +85°C) per ordering code.

Key Specifications

Pinout & Package

AT24C128-10TU-2.7 is supplied in an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), 4.4 mm body width, RoHS-compliant and halogen-free ("U" suffix). Pin 1 is marked by a notch or dot; package footprint matches JEDEC MO-153, Variation AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128-10TU-2.7, the AT24C128B-SSHM-T offers higher I²C speed and extended longevity assurance, while the M24128-BWMN6TP trades address flexibility for vendor diversification - both require validation of WP behavior and timing margins in existing designs.

Availability

AT24C128-10TU-2.7 is available at Aetrix Electronics and suitable for industrial power meters, medical diagnostic sensors, and factory automation PLCs requiring stable component supply and long-term obsolescence management.

Supply support for AT24C128-10TU-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 memory solutions, with broad industrial and automotive qualification programs.

The AT24C128 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in cost-sensitive industrial and commercial systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C128-10TU-2.7 at 2.7 V?

The AT24C128-10TU-2.7 supports up to 400 kHz I²C clock frequency when operated at 2.7 V, as specified in Table 5 (AC Characteristics – Extended Temperatures). This is lower than its 1 MHz rating at 5 V but ensures robust timing margin under low-voltage industrial conditions where noise immunity is critical. The device maintains full compatibility with standard I²C protocol at this speed.

Does AT24C128-10TU-2.7 support hardware write protection, and how is it implemented?

Yes, AT24C128-10TU-2.7 implements hardware write protection via the WP (Write Protect) pin. When WP is tied to VCC, all write operations - including byte, page, and sequential writes - are inhibited. When WP is grounded, full read/write access is enabled. If left floating, the pin is internally pulled down (for board coupling <3 pF), defaulting to write-enabled mode - though Microchip recommends explicit grounding for reliability.

What package type does AT24C128-10TU-2.7 use, and what are its key mechanical features?

AT24C128-10TU-2.7 uses an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), designated as 8A2 per Microchip's ordering guide. It has a 4.4 mm body width, 0.65 mm lead pitch, and conforms to JEDEC MO-153, Variation AA. The "U" suffix confirms RoHS-compliant, lead-free, and halogen-free construction - essential for industrial environmental compliance.

How many devices can share the same I²C bus using AT24C128-10TU-2.7, and what enables this?

Up to four AT24C128-10TU-2.7 devices can share a single I²C bus, enabled by the A0 and A1 address input pins. Each pin can be hardwired high or low (or left floating, resulting in internal pull-down), generating four unique 3-bit device address combinations (10100xx in binary). This cascading capability eliminates bus contention and simplifies multi-node system design without requiring additional I²C multiplexers.

Is AT24C128-10TU-2.7 suitable for extended temperature applications, and what is its qualified range?

Yes, AT24C128-10TU-2.7 is qualified for industrial temperature operation from –40°C to +85°C, as confirmed by its ordering code and Table 5 (AC Characteristics – Extended Temperatures). It meets this range under 2.7–5.5 V supply and is explicitly approved for extended temperature use when bearing the process letter "B" - a marking found in the lower right corner of the package top surface.