Microchip Technology AT24C512W-10SU-1.8

Overview

AT24C512W-10SU-1.8 from Microchip Technology (formerly Atmel) is a 512 Kbit (65,536 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 3.6 V, supports up to 100 kHz I²C bus speed at 1.8 V, features hardware write protection via WP pin, and delivers 100,000 write cycles with 40-year data retention. It is used in industrial sensor calibration storage and firmware parameter backup where space-constrained, reliable nonvolatile memory is required.

For engineers reviewing the AT24C512W-10SU-1.8 datasheet, AT24C512W-10SU-1.8 pinout, AT24C512W-10SU-1.8 application, or AT24C512W-10SU-1.8 equivalent, key selection considerations include its 1.8 V operation range, 128-byte page write capability, Schmitt-triggered inputs for noise immunity, TSSOP-8 package with lead-free/halogen-free compliance, and support for up to four devices on a shared I²C bus using A0/A1 address pins.

Technical Context

The AT24C512W-10SU-1.8 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting bidirectional data transfer and 9-bit acknowledge protocol. Its internal architecture organizes memory as 512 pages of 128 bytes each, enabling partial-page writes and automatic address incrementing during sequential operations.

It integrates hardware write protection via the WP pin (active-high), Schmitt-triggered inputs on SCL/SDA/A0/A1 for robust noise suppression, and an internal pull-down bias on floating A0/A1 and WP pins. The device enters low-power standby mode after STOP condition completion and supports acknowledge polling to detect write cycle completion without fixed timing delays.

Key Specifications

Pinout & Package

AT24C512W-10SU-1.8 is packaged in an 8-lead TSSOP (8A2) with 0.65 mm pitch, 3.0 mm × 4.4 mm body, and lead-free/halogen-free construction per RoHS Directive 2011/65/EU.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C512-RMN6TP and BR24G512FJ-3GE2, AT24C512W-10SU-1.8 provides verified 100 kHz I²C timing at 1.8 V with guaranteed Schmitt-trigger noise immunity and automotive-grade temperature stability, making it optimal for cost-sensitive industrial controls where robustness outweighs peak speed.

Availability

AT24C512W-10SU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded firmware parameter backup, and automotive body control module NVM requiring stable component supply across multi-year production cycles.

Supply support for AT24C512W-10SU-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with broad industrial and automotive qualification capabilities.

The AT24C512W-10SU-1.8 belongs to Microchip's legacy AT24Cxx serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile data storage in space-constrained embedded systems requiring long-term data integrity.

FAQ

What is the maximum I²C clock frequency supported by AT24C512W-10SU-1.8 at 1.8 V?

The AT24C512W-10SU-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V, as specified in Table 4 of the official datasheet. This limit ensures reliable timing margins under worst-case voltage and temperature conditions. Exceeding this frequency may result in setup/hold violations or failed acknowledge responses. The AT24C512W-10SU-1.8 does not guarantee operation above 100 kHz at 1.8 V, even if functional in bench tests.

Does AT24C512W-10SU-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C512W-10SU-1.8 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 desired rise time. For 1.8 V operation with ≤100 pF total bus capacitance, a 4.7 kΩ resistor is recommended. The AT24C512W-10SU-1.8 itself contains no internal pull-ups on these pins.

How many devices can share the same I²C bus with AT24C512W-10SU-1.8?

Up to four AT24C512W-10SU-1.8 devices can share a single I²C bus using the A0 and A1 address pins. Each device is assigned a unique 2-bit hardware address (00, 01, 10, or 11), resulting in distinct 7-bit device addresses (0x50–0x53). All devices must use identical VCC and logic levels, and total bus capacitance must remain ≤400 pF to maintain signal integrity.

What is the purpose of the NC pin on AT24C512W-10SU-1.8?

Pin 3 on AT24C512W-10SU-1.8 is designated NC (No Connect) and is electrically unconnected - it has no internal bond wire or circuit connection. It must remain unconnected on the PCB; routing traces to or from this pin may cause mechanical stress or unintended coupling. The NC pin exists for package compatibility across the AT24Cxx family and does not affect AT24C512W-10SU-1.8 functionality.

Can AT24C512W-10SU-1.8 be used in automotive applications?

Yes, AT24C512W-10SU-1.8 is qualified for automotive-grade operation across –40°C to +85°C and is offered in lead-free/halogen-free packaging compliant with RoHS. While not AEC-Q200 certified as a standalone component, its specification sheet explicitly states "Automotive Grade, Extended Temperature" and includes reliability data (100K write cycles, 40-year retention) aligned with automotive infotainment and body electronics requirements. System-level validation remains the responsibility of the end customer.