Microchip Technology AT24C512-10PU-2.7

Overview

AT24C512-10PU-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 1 MHz I²C clock at 5V and 400 kHz at 2.7V, features hardware write protection via WP pin, and delivers 100,000 write cycles with 40-year data retention. It is used in embedded systems for firmware parameter storage, calibration data logging, and configuration memory.

For engineers reviewing the AT24C512-10PU-2.7 datasheet, AT24C512-10PU-2.7 pinout, AT24C512-10PU-2.7 application, or AT24C512-10PU-2.7 equivalent, key selection considerations include its 2.7–5.5V supply range, 128-byte page write capability, Schmitt-triggered noise-immune inputs, 8-lead PDIP package, and compatibility with standard I²C bus timing requirements.

Technical Context

The AT24C512-10PU-2.7 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and positive-edge-triggered SCL. Its internal address counter supports current-address, random-address, and sequential read modes, while device addressing uses A0/A1 pins to allow up to four devices on one bus.

Write operations support both byte and 128-byte page modes, with self-timed internal write cycles (max 5 ms). Hardware write protection is enforced when WP = VCC, and all inputs feature Schmitt triggers and input filtering for robust noise immunity in electrically noisy environments.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512-10PI-2.7, the -PU variant ensures RoHS/halogen-free compliance for modern industrial PCBs; compared with M24C512-RMN6TP, it offers tighter cost control and broader design documentation support, though with lower max operating temperature.

Availability

AT24C512-10PU-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, automotive body control modules, and smart energy meters requiring stable component supply and long-term obsolescence management.

Supply support for AT24C512-10PU-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 supply chain ownership of the AT24Cxx EEPROM family. The company specializes in scalable, low-power nonvolatile memory solutions for industrial and automotive markets.

The AT24C512-10PU-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-voltage configuration storage with minimal external components.

FAQ

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

The AT24C512-10PU-2.7 supports up to 400 kHz I²C clock frequency when operated at 2.7V. This is specified in Table 4 of the datasheet under "2.7 Volt" column for fSCL. Higher frequencies (up to 1 MHz) are only guaranteed at 5.0V. Designers must ensure timing margins including tLOW, tHIGH, and tSU.STA are met at the selected VCC and clock rate.

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

Yes, AT24C512-10PU-2.7 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; 4.7 kΩ is commonly used for 400 kHz operation at 3.3V. The device itself does not integrate internal pull-ups.

How many devices can share the same I²C bus using AT24C512-10PU-2.7?

Up to four AT24C512-10PU-2.7 devices can share a single I²C bus. This is enabled by the A0 and A1 address input pins, which combine with the fixed 1010 base address to generate four unique 7-bit device addresses (1010000, 1010001, 1010010, 1010011). All NC pins must remain unconnected or grounded per layout guidance.

What is the function of the WP pin on AT24C512-10PU-2.7?

The WP (Write Protect) pin on AT24C512-10PU-2.7 enables hardware-level write inhibition. When WP is driven high to VCC, all write operations-including byte, page, and erase-are blocked. When WP is low (GND), full read/write access is permitted. Floating WP is internally pulled down, but Microchip recommends explicit GND connection for reliability.

Is AT24C512-10PU-2.7 compatible with 1.8V I²C systems?

No, AT24C512-10PU-2.7 is not compatible with 1.8V I²C systems. Its suffix "-2.7" denotes the 2.7V–5.5V operating range. For 1.8V operation, the correct variant is AT24C512-10PU-1.8, which supports 1.8V–3.6V and is rated for 100 kHz maximum clock speed. Mixing voltage variants risks functional failure or reduced reliability.