STMicroelectronics M24256-BWMN6TP

Overview

M24256-BWMN6TP from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, operating from 2.5 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-BWMN6TP datasheet, M24256-BWMN6TP pinout, M24256-BWMN6TP application, or M24256-BWMN6TP equivalent, key selection factors include supply voltage range (2.5–5.5 V), TSSOP8 package compatibility, I²C bus speed (1 MHz max), and hardware write lock capability via WC input.

Technical Context

The device implements a standard I²C slave protocol with 7-bit device addressing and configurable chip enable (E2–E0) pins enabling up to eight devices on one bus. It supports random, current-address, and sequential read modes with automatic address roll-over at memory boundaries.

Internal ECC logic operates transparently across groups of four consecutive bytes, correcting single-bit errors during reads and distributing write cycles across each group to extend endurance. Write control (WC) disables all writes when high, independent of I²C transaction state.

Key Specifications

Pinout & Package

TSSOP8 (DW) package, 169 mil width, 0.65 mm pitch, RoHS-compliant ECOPACK2. Pin 1 marked by notch or bevel; body dimensions 4.4 mm × 3.0 mm × 1.2 mm.

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-BWMN6TP provides deterministic hardware-level write disable and guaranteed 2.5 V operation - critical for industrial systems where brown-out resilience and tamper resistance are non-negotiable.

Availability

M24256-BWMN6TP is available at Aetrix Electronics and suitable for industrial PLCs, smart sensors, medical diagnostics equipment, and energy metering systems requiring stable component supply across extended production lifecycles.

Supply support for M24256-BWMN6TP 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.

M24256 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 requirements.

FAQ

What is the function of the WC pin on M24256-BWMN6TP?

The WC (Write Control) pin is a hardware-level write disable input. When driven high, it prevents all write operations-including byte, page, and identification page writes-regardless of I²C commands sent. This feature ensures memory contents remain intact during power transients, MCU resets, or firmware anomalies, eliminating reliance on software locks.

Does M24256-BWMN6TP support 1 MHz I²C operation across its full voltage range?

Yes. The M24256-BWMN6TP supports 1 MHz I²C clock frequency from 2.5 V to 5.5 V, as verified in DS1766 Rev 35 AC characteristics (Table 10). This allows full-speed communication with 3.3 V and 5 V microcontrollers without clock throttling or voltage translation circuitry.

How does the internal ECC work, and does it affect read/write timing?

The ECC logic corrects single-bit errors across every group of four consecutive bytes during read operations. It operates transparently-no additional timing overhead is added to reads or writes. Writes to any byte automatically cycle all four bytes in its group, distributing endurance wear but preserving deterministic 5 ms write latency.

Can M24256-BWMN6TP be used in place of M24256-BW without design changes?

Yes. M24256-BWMN6TP is the tape-and-reel packaged variant of the M24256-BW in TSSOP8 (DW) form factor. It shares identical electrical specifications, pinout, timing, and functionality. The "MN6TP" suffix denotes packaging and reel orientation per ST's ordering code convention-not a functional revision.