Microchip Technology AT24C512-10UI-2.7

Overview

AT24C512-10UI-2.7 from Microchip Technology (formerly Atmel) is a 512 Kbit (65,536 × 8) serial EEPROM with 2-wire I²C interface, operating at 2.7V–5.5V supply, supporting up to 400 kHz clock rate, featuring 128-byte page write mode, hardware write protection via WP pin, and industrial temperature range (−40°C to +85°C). It is used for nonvolatile parameter storage in embedded controllers, power meters, and industrial sensors.

For engineers reviewing the AT24C512-10UI-2.7 datasheet, AT24C512-10UI-2.7 pinout, AT24C512-10UI-2.7 application, or AT24C512-10UI-2.7 equivalent, key selection criteria include voltage compatibility (2.7V–5.5V), industrial-grade reliability (100,000 write cycles, 40-year data retention), I²C bus scalability (up to 4 devices), and package options including 8-pin LAP.

Technical Context

The AT24C512-10UI-2.7 implements a standard I²C-compatible 2-wire serial interface with Schmitt-triggered, noise-filtered inputs and open-drain SDA/SCL pins enabling wired-OR bus topology. It uses A0/A1 address pins to support up to four devices on one bus, with internal pull-down biasing when unconnected.

It supports byte and 128-byte page writes with self-timed internal write cycles (typ. 5 ms), acknowledge polling for completion detection, and hardware/software write protection via the WP pin-tied high to VCC for full memory lockout or controlled dynamically during operation.

Key Specifications

Pinout & Package

AT24C512-10UI-2.7 is packaged in an 8-pin Leadless Array Package (LAP), 3.0 mm × 3.0 mm body, 0.5 mm pitch, bottom-terminal layout. Pin 1 is marked by chamfered corner; no external decoupling capacitor required due to low ICC/ISB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C512-RMN6TP and BR24G512FJ-WE2, the AT24C512-10UI-2.7 uniquely combines industrial temperature rating, hardware WP, and 8-pin LAP packaging - making it the only option qualified for ruggedized embedded systems requiring both reliability and space-constrained layout.

Availability

AT24C512-10UI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, and automotive body control units requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for AT24C512-10UI-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 acquired Atmel in 2016 and maintains full product support, documentation, and qualification for legacy Atmel EEPROMs including the AT24C512 family.

The AT24C512 series was designed for robust, low-power nonvolatile storage in resource-constrained embedded systems - emphasizing I²C interoperability, industrial reliability, and flexible voltage operation across consumer, industrial, and automotive segments.

FAQ

What is the maximum I²C clock frequency supported by AT24C512-10UI-2.7?

The AT24C512-10UI-2.7 supports up to 400 kHz I²C clock frequency when operated within its 2.7V–5.5V supply range. This is specified in the AC Characteristics table under fSCL (2.7-volt column). The device does not support 1 MHz operation - that speed is only guaranteed for the 5.0V variant (e.g., AT24C512-10UI) or 1.8V variants with tighter timing margins. Using >400 kHz may result in ACK failures or data corruption.

Does AT24C512-10UI-2.7 have built-in write protection, and how is it enabled?

Yes, AT24C512-10UI-2.7 includes hardware write protection via the WP pin. When WP is tied to VCC, all write operations (byte and page) are inhibited; when WP is grounded, normal writes are permitted. If left unconnected, WP is internally pulled down to GND, enabling writes by default. This dual-mode protection allows both permanent lockdown (via hardwired VCC) and dynamic control (via MCU GPIO).

What package type is used for AT24C512-10UI-2.7, and what are its key mechanical features?

AT24C512-10UI-2.7 uses the 8-pin Leadless Array Package (LAP), designated as 8C1 in Microchip's ordering guide. It measures 3.0 mm × 3.0 mm with 0.5 mm pitch, bottom-mounted solder terminals, and no exposed pad. Its compact footprint and absence of leads reduce board area and improve resistance to mechanical shock - ideal for space-constrained industrial modules where PDIP or SOIC would be impractical.

Can multiple AT24C512-10UI-2.7 devices share the same I²C bus, and how many?

Yes, up to four AT24C512-10UI-2.7 devices can share a single I²C bus using the A0 and A1 address pins. Each device's I²C slave address is formed as 0b1010xxX, where xx is the binary value of A1:A0 (00–11). Since AT24C512-10UI-2.7 has hardwired or floating A0/A1 pins, users assign unique combinations to avoid address collisions - enabling scalable parameter storage across distributed sensor nodes without bus expansion hardware.

What is the typical write cycle time for AT24C512-10UI-2.7, and how is completion detected?

The typical internal write cycle time for AT24C512-10UI-2.7 is 5 ms, with a maximum of 10 ms per page (as specified in tWR). Completion is detected via acknowledge polling: after issuing a write command and stop condition, the host repeatedly sends a START + device address (with R/W = 0); the AT24C512-10UI-2.7 responds with ACK only once the write is complete. This avoids fixed-delay waits and optimizes bus utilization in real-time systems.