Microchip Technology AT24C512-10PI-2.7

Overview

AT24C512-10PI-2.7 from Microchip Technology (formerly Atmel) is a 512 Kbit (65,536 × 8) two-wire serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports up to 400 kHz I²C bus speed at 2.7V, features hardware write protection via the WP pin, and delivers 100,000 write cycles with 40-year data retention. It is commonly used in embedded systems for configuration storage, calibration data logging, and firmware parameter backup.

For engineers reviewing the AT24C512-10PI-2.7 datasheet, AT24C512-10PI-2.7 pinout, AT24C512-10PI-2.7 application, or AT24C512-10PI-2.7 equivalent, key selection considerations include its 2.7V–5.5V supply range, 128-byte page write capability, Schmitt-triggered inputs for noise immunity, 8-pin PDIP package, and industrial temperature rating (–40°C to +85°C).

Technical Context

The AT24C512-10PI-2.7 implements a standard I²C-compatible 2-wire interface with bidirectional open-drain SDA and edge-triggered SCL. Its internal address counter enables current-address, random-address, and sequential read modes, while device addressing uses A0/A1 pins to support up to four devices on a shared bus.

Write operations are self-timed (typ. 5 ms), support byte and 128-byte page writes, and include acknowledge polling for host synchronization. Hardware write protection is enforced when WP = VCC, and floating WP defaults to GND via internal pull-down - enabling flexible software/hardware data security schemes without external components.

Key Specifications

Pinout & Package

AT24C512-10PI-2.7 is supplied in an 8-pin Plastic Dual In-line Package (PDIP), 0.300" wide (package code 8P3), with through-hole mounting and industry-standard footprint compatibility.

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 AT24C512-10PI-2.7 uniquely combines through-hole PDIP packaging, guaranteed 400 kHz operation across its full 2.7V–5.5V range, and industrial temperature qualification - making it the only option for retrofitting or maintaining legacy industrial control hardware without PCB redesign.

Availability

AT24C512-10PI-2.7 is available at Aetrix Electronics and suitable for industrial programmable logic controllers, smart energy meters, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for AT24C512-10PI-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 technical and manufacturing continuity for the AT24Cxx EEPROM family.

The AT24C512-10PI-2.7 belongs to Microchip's legacy serial EEPROM product line, engineered specifically for industrial and commercial systems demanding proven reliability, wide supply voltage tolerance, and long-term data integrity without complex initialization sequences.

FAQ

What is the maximum I²C clock frequency supported by AT24C512-10PI-2.7 at 3.3V?

The AT24C512-10PI-2.7 supports up to 400 kHz I²C clock frequency across its entire specified supply range of 2.7V to 5.5V - including at 3.3V. This is explicitly characterized in the AC Electrical Characteristics table under the "2.7-volt" column, confirming reliable operation at 400 kHz regardless of whether VCC is 2.7V, 3.3V, or 5.0V. The device does not support 1 MHz operation unless powered at 5.0V.

Does AT24C512-10PI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C512-10PI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. The datasheet specifies typical pull-up values of 1.3 kΩ for 2.7V/5V operation and 10 kΩ for 1.8V operation. Without these resistors, the bus cannot achieve valid high logic levels, and communication will fail. The AT24C512-10PI-2.7 itself contains no internal pull-ups.

Can AT24C512-10PI-2.7 be used in place of AT24C512-10PI without changes to firmware or hardware?

Yes - AT24C512-10PI-2.7 is functionally and pin-compatible with AT24C512-10PI. Both share identical pinout, timing, command set, and memory organization. The only difference is the voltage rating: AT24C512-10PI-2.7 guarantees 400 kHz operation down to 2.7V, whereas AT24C512-10PI is rated only for 4.5V–5.5V. Firmware and hardware require no modifications when substituting AT24C512-10PI-2.7 into existing AT24C512-10PI designs.

How does the WP pin behave when left unconnected on AT24C512-10PI-2.7?

When the WP pin is left unconnected on AT24C512-10PI-2.7, it is internally pulled down to GND via a proprietary bias circuit. This default state enables normal write operations. To activate hardware write protection, WP must be actively driven high to VCC. The internal pull-down eliminates the need for an external resistor in most configurations, simplifying board design while ensuring safe default behavior.

What is the purpose of the NC pin on AT24C512-10PI-2.7, and how should it be handled on the PCB?

The NC (No Connect) pin on AT24C512-10PI-2.7 is an un-bonded die pad with no internal connection. It must remain electrically floating - neither connected to GND, VCC, nor any signal trace. PCB layout guidelines prohibit routing copper to or placing vias near this pin. Doing so may cause unpredictable leakage paths or mechanical stress on the bond wire structure, potentially compromising long-term reliability of the AT24C512-10PI-2.7.