STMicroelectronics M24C32-RMN6P

Overview

M24C32-RMN6P from STMicroelectronics is a 32-Kbit I²C-compatible serial EEPROM organized as 4 K × 8 bits, featuring hardware write protection (WC pin), 32-byte page write capability, and operation across 1.7 V to 5.5 V at -40 °C to +85 °C. It supports Fast Mode Plus (1 MHz), Fast Mode (400 kHz), and Standard Mode (100 kHz) I²C bus timing, and is used in industrial sensor calibration storage, embedded system configuration retention, and power-meter firmware parameter backup.

For engineers reviewing the M24C32-RMN6P datasheet, M24C32-RMN6P pinout, M24C32-RMN6P application, or M24C32-RMN6P equivalent, key selection criteria include I²C speed compatibility, voltage range margin for brown-out resilience, WC-controlled memory lock granularity, and SO8N package footprint compatibility with legacy PCB layouts.

Technical Context

The M24C32-RMN6P implements a standard I²C target protocol with 7-bit device addressing (1010xxxR/W), where E0–E2 pins define the three LSBs of the address. It uses an internal address counter that auto-increments during sequential reads and supports both random and current-address read modes without external address latching.

Its write control (WC) input provides hardware-level protection for the entire memory array-asserting WC high disables all write acknowledgments while preserving read functionality. The device includes a power-on reset (POR) circuit ensuring no spurious writes during VCC ramp-up, and supports polling via ACK to detect write cycle completion without fixed timeout delays.

Key Specifications

Pinout & Package

Package: SO8N (150 mil width), RoHS-compliant ECOPACK2, surface-mount plastic small-outline package with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the M24C32-RMN6P uniquely combines SO8N footprint compatibility, hardware WC pin, and full -40 °C to +85 °C operation - making it optimal for industrial retrofit and safety-certified designs where pinout stability and physical write lock are mandatory.

Availability

M24C32-RMN6P is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, embedded system configuration, and medical device parameter storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for M24C32-RMN6P 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, specializing in microcontrollers, power management ICs, and non-volatile memory solutions for industrial, automotive, and consumer markets.

The M24C32 series belongs to ST's serial EEPROM product line, designed specifically for robust, low-power, I²C-based configuration and calibration data storage in harsh environments and safety-critical applications.

FAQ

What is the function of the WC pin on the M24C32-RMN6P?

The WC (Write Control) pin is a hardware-level enable/disable input for all write operations. When driven high, it prevents any byte or page write to the entire memory array-even if valid I²C write commands are issued-while still allowing full read access. This ensures configuration integrity during power transitions or firmware faults, and eliminates reliance on software-only protection schemes.

Can the M24C32-RMN6P operate reliably at 1.7 V and -40 °C simultaneously?

Yes. The M24C32-RMN6P is fully specified for operation across the full industrial temperature range (-40 °C to +85 °C) at supply voltages as low as 1.7 V. Its internal POR circuit and EEPROM cell design guarantee correct I²C communication, address decoding, and write completion under these conditions, validated per STMicroelectronics DS0952 Rev 33 test conditions.

Does the M24C32-RMN6P support I²C clock stretching?

No. The M24C32-RMN6P does not implement clock stretching. It relies on fixed internal write cycle timing (max 5 ms), and bus masters must either wait for completion using ACK polling or enforce fixed delays. This simplifies master-side timing but requires explicit handling of write latency rather than dynamic SCL hold-off.

How many unique I²C addresses can be assigned using E0–E2 pins?

The E0, E1, and E2 pins configure the three least significant bits of the 7-bit I²C device address (base 1010xxx), allowing up to eight unique addresses (000 to 111) on the same bus. In the M24C32-RMN6P SO8N package, these pins are bonded and accessible-unlike UFDFPN5 variants where they are unconnected and default to 000.