STMicroelectronics M24256-BRMN6P

Overview

M24256-BRMN6P from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, operating from 1.8 V to 5.5 V with 1 MHz clock support. It features 64-byte page write, hardware write protection via WC pin, and enhanced ESD/latch-up immunity. Used in industrial control modules for parameter storage and calibration data retention.

For engineers reviewing the M24256-BRMN6P datasheet, M24256-BRMN6P pinout, M24256-BRMN6P application, or M24256-BRMN6P equivalent, key selection criteria include supply voltage range (1.8–5.5 V), I²C clock compatibility (100 kHz/400 kHz/1 MHz), page size (64 bytes), write cycle endurance (>4 million), and package-specific pin mapping for TSSOP8.

Technical Context

The device implements a slave-only I²C interface with start/stop detection, ACK/NACK handshaking, and address decoding using three chip-enable inputs (E2–E0) to configure the 3-bit device address. Internal ECC logic corrects single-bit errors across 4-byte groups without protocol visibility.

It integrates a high-voltage generator and sequencer for EEPROM programming, supports random/sequential read modes, and uses a power-on-reset circuit to prevent spurious writes during power ramp. Write control (WC) disables all memory writes when driven high, independent of I²C transaction state.

Key Specifications

Pinout & Package

Package: TSSOP8 (DW), 169 mil width, RoHS-compliant ECOPACK2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C256-10PU-2.7 and BR24G256FJ-WE2, M24256-BRMN6P uniquely combines hardware write control (WC), ECC, and 1 MHz I²C speed across 1.8–5.5 V - making it optimal for industrial and medical systems where data integrity and deterministic protection are design-critical.

Availability

M24256-BRMN6P is available at Aetrix Electronics and suitable for industrial PLC modules, smart energy meters, automotive body control units, and medical diagnostic devices requiring stable component supply and long-term lifecycle assurance.

Supply support for M24256-BRMN6P 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.

M24256 belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based nonvolatile storage in space-constrained and mission-critical embedded systems.

FAQ

What is the function of the WC pin on M24256-BRMN6P?

The WC (Write Control) pin is an active-high hardware lock that disables all write operations to the entire memory array when driven high. Unlike software-based write protection, WC operates independently of I²C commands and prevents accidental or malicious writes during power transitions or firmware faults. It requires no initialization and remains effective even if the host MCU fails.

Does M24256-BRMN6P support 1 MHz I²C operation across its full voltage range?

Yes - M24256-BRMN6P supports 1 MHz I²C clock operation from 1.8 V to 5.5 V, verified per DS1766 Rev 35 AC characteristics (Table 10). This enables high-speed parameter loading in real-time systems without voltage derating, unlike many competing EEPROMs that limit speed to 400 kHz below 2.5 V.

How does the ECC feature improve reliability in long-term deployments?

M24256-BRMN6P applies transparent single-bit error correction across every 4-byte group. During read operations, detected bit flips (e.g., from radiation or aging) are automatically corrected before data reaches the host. This extends functional lifetime in environments with elevated EMI or thermal stress, eliminating silent data corruption without host software involvement.

Can multiple M24256-BRMN6P devices share the same I²C bus?

Yes - up to eight devices can coexist on one I²C bus using the E2, E1, and E0 pins to configure unique 3-bit chip addresses. Each pin tied to VCC or VSS sets one bit; floating defaults to low. This enables scalable parameter storage across multi-sensor nodes or modular control systems without address conflicts.