Microchip Technology AT24C128-10TU-1.8-T

Overview

AT24C128-10TU-1.8-T 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. It is used in industrial sensor calibration storage and portable medical device configuration memory.

For engineers reviewing the AT24C128-10TU-1.8-T datasheet, AT24C128-10TU-1.8-T pinout, AT24C128-10TU-1.8-T application, or AT24C128-10TU-1.8-T equivalent, key selection considerations include 1.8 V operation margin, 64-byte page write capability, TSSOP-8 package footprint, extended industrial temperature range (–40°C to +85°C), and I²C timing compliance at low supply voltage.

Technical Context

The AT24C128-10TU-1.8-T implements a standard two-wire (I²C-compatible) interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. It uses a cascaded addressing scheme with A0/A1 pins enabling up to four devices on one bus, and supports both byte and 64-byte page writes with self-timed internal write cycles.

Its memory is organized as 256 pages of 64 bytes each, requiring a 14-bit word address. The WP pin provides hardware-level write inhibition when pulled high, while internal pull-downs on A0, A1, and WP ensure deterministic behavior when left floating under specified capacitive coupling conditions.

Key Specifications

Pinout & Package

AT24C128-10TU-1.8-T is housed 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 beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128-10TU-1.8-T, AT24C128B-SSHM-T removes process-letter dependency for endurance assurance, while M24128-BWMN6TP extends voltage range and raises 1.8 V I²C speed to 400 kHz - both offer drop-in TSSOP-8 replacement but differ in qualification rigor and timing headroom.

Availability

AT24C128-10TU-1.8-T is available at Aetrix Electronics and suitable for industrial sensor calibration storage, portable medical device configuration, and smart energy meter firmware parameters requiring stable component supply and long-lifecycle support.

Supply support for AT24C128-10TU-1.8-T 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 broad industrial and automotive qualification coverage.

The AT24C128 series belongs to Microchip's legacy serial EEPROM product line, designed for reliable, low-power, I²C-based configuration and calibration storage in space- and power-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C128-10TU-1.8-T at 1.8 V?

The AT24C128-10TU-1.8-T supports a maximum I²C clock frequency of 100 kHz when operated at 1.8 V. This is specified in Table 4 (AC Characteristics – Industrial Temperatures) of the datasheet and reflects timing margins validated for reliable communication under low-voltage conditions. Higher frequencies (e.g., 400 kHz) require ≥2.5 V supply.

Does AT24C128-10TU-1.8-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C128-10TU-1.8-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input. Typical values range from 2.2 kΩ to 10 kΩ to VCC (1.8 V), selected based on bus capacitance and desired rise time. No internal pull-ups are provided.

How is write protection implemented on AT24C128-10TU-1.8-T?

Write protection on AT24C128-10TU-1.8-T is implemented via the WP (Write Protect) pin: when WP is driven high to VCC, all write operations (byte and page) are inhibited. When WP is low or floating (internally pulled down), writes are enabled. This is a hardware-level feature independent of software commands.

What package type does AT24C128-10TU-1.8-T use, and what are its key mechanical dimensions?

AT24C128-10TU-1.8-T uses an 8-lead TSSOP (Thin Shrink Small Outline Package) with 4.4 mm body width. Key dimensions include: D = 2.90–3.10 mm (body width), E = 6.40 mm (typical lead-to-lead length), e = 0.65 mm (pitch), and L = 0.45–0.75 mm (lead length). It is RoHS-compliant and halogen-free ("U" suffix).

Is AT24C128-10TU-1.8-T suitable for new designs, or is it obsolete?

AT24C128-10TU-1.8-T is not recommended for new designs per Microchip's official documentation (Revision History, 0670T, March 2007). Engineers should migrate to the AT24C128B series (e.g., AT24C128B-SSHM-T), which offers improved endurance guarantees and updated qualification - though AT24C128-10TU-1.8-T remains available for legacy support and existing production.