Microchip Technology AT24C512-10UI-1.8

Overview

AT24C512-10UI-1.8 from Microchip Technology (formerly Atmel) is a 512 Kbit (65,536 × 8) serial EEPROM with I²C-compatible 2-wire interface, optimized for low-voltage embedded systems operating from 1.8 V to 3.6 V. It supports 100 kHz clock frequency at 1.8 V, features hardware write protection via WP pin, and delivers 100,000 write cycles and 40-year data retention - used in industrial sensor calibration storage and firmware parameter backup.

For engineers reviewing the AT24C512-10UI-1.8 datasheet, AT24C512-10UI-1.8 pinout, AT24C512-10UI-1.8 application, or AT24C512-10UI-1.8 equivalent, key selection criteria include 1.8 V supply compatibility, 128-byte page write capability, Schmitt-triggered noise-immune inputs, and industrial temperature range (-40°C to +85°C) support.

Technical Context

The AT24C512-10UI-1.8 implements a true I²C-compliant 2-wire serial interface with open-drain SDA and edge-triggered SCL, supporting up to four devices on a shared bus via A0/A1 address pins. Its internal architecture organizes memory as 512 pages of 128 bytes each, enabling partial-page writes without boundary alignment.

It uses a self-timed internal write cycle (typ. 5 ms, max 10 ms), with acknowledge polling support to detect completion. The WP pin provides hardware-level write inhibition when tied to VCC, while floating WP defaults to GND via internal pull-down - critical for fail-safe configuration storage in power-cycled systems.

Key Specifications

Pinout & Package

AT24C512-10UI-1.8 is supplied in an 8-pin Leadless Array Package (LAP), 0.300" wide, with exposed pad not electrically connected. Package dimensions: 4.90 mm × 3.90 mm × 1.10 mm (max height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512-10UI-1.8, M95M04-DRMN6TP/K offers higher density and speed but demands SPI infrastructure and lacks dedicated hardware write protection, while BR24G512FJ-WE2 provides stronger reliability features including ECC and higher ESD rating - making it preferable where functional safety or long-term data integrity is prioritized over cost-sensitive commodity use.

Availability

AT24C512-10UI-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, medical sensor modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AT24C512-10UI-1.8 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 acquired Atmel in 2016 and maintains full product continuity, quality assurance, and long-term supply commitment for legacy Atmel EEPROMs including the AT24C512 series.

The AT24C512 family was designed for reliable, low-voltage nonvolatile data storage in resource-constrained embedded systems - emphasizing write endurance, noise immunity, and seamless I²C integration without external components.

FAQ

What is the maximum I²C clock frequency supported by AT24C512-10UI-1.8?

The AT24C512-10UI-1.8 supports up to 100 kHz I²C clock frequency when operated at 1.8 V. This is specified in the AC Characteristics table under fSCL for the 1.8-volt column. Higher frequencies (400 kHz, 1 MHz) require ≥2.7 V or ≥4.5 V supply respectively - not applicable to the -1.8 suffix variant. The 100 kHz limit ensures timing margin for rise/fall times and noise immunity at minimum voltage.

Does AT24C512-10UI-1.8 support page write operations, and what is the page size?

Yes, AT24C512-10UI-1.8 supports 128-byte page write operations. The memory is internally organized into 512 pages of 128 bytes each, and partial page writes are allowed. This enables efficient sequential writes without crossing page boundaries - reducing total write time significantly compared to byte-by-byte programming. The page size is fixed and cannot be reconfigured.

What is the function of the WP pin on AT24C512-10UI-1.8, and how should it be connected?

The WP (Write Protect) pin on AT24C512-10UI-1.8 enables hardware-level inhibition of all write operations when driven high to VCC. When left unconnected, it is internally pulled down to GND, allowing normal writes. For permanent protection, tie WP to VCC; for dynamic control, connect to a GPIO. This feature prevents accidental overwrites during power transitions or firmware updates - a critical safeguard in AT24C512-10UI-1.8 deployments.

Is AT24C512-10UI-1.8 qualified for industrial temperature operation?

Yes, AT24C512-10UI-1.8 is rated for industrial temperature operation from -40°C to +85°C. The "I" in the part number denotes Industrial grade, and this range is confirmed in the Ordering Information table and Absolute Maximum Ratings section. It is validated for continuous operation across this range, including data retention and write endurance specifications.

What package type is used for AT24C512-10UI-1.8, and are there thermal considerations?

AT24C512-10UI-1.8 uses the 8-pin Leadless Array Package (LAP), designated as 8C1 in Microchip's ordering matrix. This surface-mount package measures 4.90 mm × 3.90 mm with 0.5 mm pitch. It has no thermal pad; junction-to-ambient thermal resistance is ~200°C/W. For sustained write cycling, keep ambient temperature below 70°C and ensure adequate PCB copper area for passive dissipation - especially during back-to-back page writes.