STMicroelectronics M24C64-WMN6TP

Overview

M24C64-WMN6TP from STMicroelectronics is a 64-Kbit I²C-compatible serial EEPROM organized as 8 K × 8 bits, operating from 2.5 V to 5.5 V over –40 °C to +85 °C. It supports 1 MHz, 400 kHz, and 100 kHz I²C bus modes; features 32-byte page write with ≤5 ms internal write time; includes hardware write protection via WC pin; and delivers >4 million write cycles with >200-year data retention. It is used in industrial control modules for parameter storage and calibration data logging.

For engineers reviewing the M24C64-WMN6TP datasheet, M24C64-WMN6TP pinout, M24C64-WMN6TP application, or M24C64-WMN6TP equivalent, key selection considerations include I²C speed compatibility (1 MHz), supply voltage range (2.5–5.5 V), page size (32 bytes), write protect functionality (WC pin), and SO8N package footprint for board space-constrained designs.

Technical Context

The M24C64-WMN6TP implements a standard I²C slave protocol with start/stop detection, 7-bit device addressing (1010xxxR/W), and ACK/NACK handshaking. Its internal architecture includes an address register, page latches, ECC logic (on K-process variants), and a high-voltage generator for EEPROM cell programming.

It supports three read modes - random, current address, and sequential - and two write modes - byte and page - with automatic address incrementing and page boundary roll-over. The WC pin provides hardware-level write lock for the entire memory array, independent of software commands.

Key Specifications

Pinout & Package

Package: SO8N (ECOPACK2), 150 mil width, RoHS-compliant and halogen-free surface-mount package with standard 8-pin DIP footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D-SSHM-T and BR24G64FJ-WE2, the M24C64-WMN6TP uniquely combines hardware WC-based full-array lock, guaranteed 2.5–5.5 V operation across industrial temperature range, and SO8N packaging optimized for automated optical inspection (AOI) in high-reliability manufacturing.

Availability

M24C64-WMN6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and automotive body control unit designs requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for M24C64-WMN6TP 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory products for industrial, automotive, and consumer markets.

The M24C64-WMN6TP belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based nonvolatile storage in harsh environments with extended temperature and reliability requirements.

FAQ

What is the default I²C slave address of M24C64-WMN6TP in SO8N package?

The SO8N package fixes E0–E2 inputs internally to logic low (000), resulting in a base 7-bit I²C address of 0x50. With R/W bit appended, read address is 0xA1 and write address is 0xA0. No external pull-up/down resistors are needed on E0–E2 for this variant.

Can M24C64-WMN6TP perform page writes across 32-byte boundaries?

No - page writes are strictly confined within a single 32-byte page. If more than remaining bytes in the current page are sent, data wraps around to the start of the same page (e.g., writing 35 bytes starting at address 0x001E writes bytes 0x001E–0x001F, then 0x0000–0x0020). Cross-page writes require separate page write commands.

Is the WC pin active-high or active-low, and what happens when it floats?

The WC pin is active-high: driving it high disables all write operations to the memory array. When left floating (unconnected), WC is internally pulled low, enabling writes. This default behavior ensures functional operation without external biasing in simple designs.

Does M24C64-WMN6TP include error correction code (ECC) functionality?

ECC is implemented only in devices marked with process letter 'K' (e.g., M24C64-WMN6TP-K). Standard M24C64-WMN6TP units do not include ECC. When present, ECC corrects single-bit errors per 4-byte group transparently during reads, improving long-term data reliability without software intervention.