STMicroelectronics M24C32-WMN6P

Overview

M24C32-WMN6P from STMicroelectronics is a 32-Kbit I²C-compatible serial EEPROM organized as 4 K × 8 bits, operating from 2.5 V to 5.5 V over -40 °C to +85 °C. It supports I²C bus modes up to 1 MHz (Fast Mode Plus), features 32-byte page write, hardware write protection via WC pin, and delivers >4 million write cycles with >200-year data retention. Used for parameter storage in industrial controllers and embedded sensor calibration.

For engineers reviewing the M24C32-WMN6P datasheet, M24C32-WMN6P pinout, M24C32-WMN6P application, or M24C32-WMN6P equivalent, key selection criteria include supply voltage range (2.5–5.5 V), I²C timing compliance (1 MHz Fast Mode Plus), page size (32 bytes), write protection architecture (WC-controlled hardware lock), and package-specific pin mapping (SO8N, 150-mil width).

Technical Context

The M24C32-WMN6P implements a standard I²C target protocol with 7-bit device addressing, supporting random and sequential read modes plus byte/page write operations. Its internal address counter auto-increments after each read/write, and it includes a power-on reset (POR) circuit that prevents spurious writes during power-up transitions.

Hardware write protection is implemented via the WC input: when driven high, all memory writes are inhibited regardless of I²C command; when low or floating, writes proceed normally. Chip enable inputs E2–E0 are internally pulled low in the MN (SO8N) package, fixing the device address to 1010000b (0xA0) for write and 1010001b (0xA1) for read.

Key Specifications

Pinout & Package

Package: SO8N (150-mil width), RoHS-compliant ECOPACK2. Pinout validated per STMicroelectronics DS0952 Rev 33 (Figure 2, page 2/46).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D and BR24G32FJ, the M24C32-WMN6P provides guaranteed 2.5–5.5 V operation with hardware WC lock-ideal for 3.3 V/5 V industrial systems needing deterministic write disable without MCU intervention.

Availability

M24C32-WMN6P is available at Aetrix Electronics and suitable for industrial PLCs, medical calibration systems, smart energy meters, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for M24C32-WMN6P 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 solutions for industrial, automotive, and consumer markets.

The M24C32 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based nonvolatile storage in harsh industrial and medical environments with stringent reliability and longevity demands.

FAQ

What is the function of the WC pin on M24C32-WMN6P?

The WC (Write Control) pin is an active-high hardware lock: when driven high, it disables all write operations-including byte, page, and identification page writes-regardless of I²C command. This prevents accidental or malicious memory corruption during power transients, noise events, or firmware faults. When low or floating, full write functionality is restored.

Does M24C32-WMN6P support 1 MHz I²C communication in all packages?

Yes-M24C32-WMN6P supports Fast Mode Plus (1 MHz) I²C operation across all package variants including SO8N (MN), TSSOP8 (DW), UFDFPN8 (MC), and UFDFPN5 (MH). The 1 MHz specification is guaranteed under standard load conditions (400 pF bus capacitance, 2.5–5.5 V VCC) per DS0952 Rev 33 AC characteristics table.

How does the chip enable (E0–E2) addressing work in the SO8N package?

In the SO8N (MN) package, E0, E1, and E2 pins are internally pulled low, fixing the 3-bit chip address to 000. This results in a base I²C 7-bit device address of 1010000b (0xA0) for write operations and 1010001b (0xA1) for read operations-no external resistors or connections are needed for single-device configurations.

Is the M24C32-WMN6P pinout compatible with other M24C32 variants like M24C32-F or M24C32-R?

Yes-the SO8N (MN) package shares identical pinout and electrical characteristics across all M24C32 variants (W, R, F, DF, X). Differences lie solely in voltage range (e.g., M24C32-W: 2.5–5.5 V; M24C32-F: 1.7–5.5 V) and optional features (e.g., identification page only in M24C32-DF), not pin assignment or mechanical footprint.