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Home > Products > Integrated Circuits (ICs) > Memory > Memory

STMicroelectronics M24256-BFDW6TP

Name: M24256-BFDW6TP
Brand: STMicroelectronics
SKU: M24256-BFDW6TP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M24256-BFDW6TP

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: M24256-BFDW6TP.pdf

Description:: IC EEPROM 256KBIT I2C 8TSSOP

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Inventory:14,139

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Product details

Overview

M24256-BFDW6TP from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, operating from 1.7 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 sensor calibration storage, where nonvolatile parameter retention and I²C bus compatibility are critical.

For engineers reviewing the M24256-BFDW6TP datasheet, M24256-BFDW6TP pinout, M24256-BFDW6TP application, or M24256-BFDW6TP equivalent, key selection criteria include supply voltage range (1.7–5.5 V), page size (64 byte), write cycle endurance (>4 million), data retention (>200 years), and TSSOP8 ECOPACK2 RoHS-compliant packaging.

Technical Context

The device implements a fully compliant I²C slave interface with START/STOP detection, ACK/NACK handshaking, and 7-bit device addressing with three chip-enable inputs (E2–E0) for multi-device bus configuration. It supports random, current-address, and sequential read modes without requiring external address latches.

Internal architecture includes an HV generator and sequencer for EEPROM programming, ECC logic correcting single-bit errors per 4-byte group, and a power-on-reset circuit preventing spurious writes during power ramp. The WC pin provides hardware-level array-wide write inhibit independent of I²C command flow.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	256 Kbit (32 K × 8 bits) - supports firmware parameter tables and calibration data sets up to 32 KB.
Interface	I²C bus (100 kHz / 400 kHz / 1 MHz) - interoperable with standard microcontroller I²C peripherals without protocol translation.
Page Size	64 bytes - enables efficient bulk writes within one internal write cycle (≤5 ms), minimizing bus occupancy.
Write Endurance	>4 million cycles - suitable for high-frequency logging applications such as energy meter tamper-event counters.
Data Retention	>200 years at +25 °C - ensures long-term reliability in unattended infrastructure monitoring nodes.
Supply Voltage	1.7 V to 5.5 V - compatible with both 1.8 V logic domains and legacy 3.3 V/5 V systems without level shifters.
Operating Temp	−40 °C to +85 °C - qualified for industrial control cabinets and outdoor environmental sensors.
ESD Protection	>4 kV HBM - reduces risk of field failure in handling-sensitive manufacturing and service environments.

Pinout & Package

TSSOP8 (DW) package: 8-lead, 169 mil body width, ECOPACK2 RoHS-compliant and halogen-free. Pin 1 marked by notch or dot; lead finish is matte tin.

Pin/Terminal	Circuit Role	Design Meaning
E0, E1, E2	Chip Enable Inputs	Set 3 LSBs of 7-bit I²C device address; tied high/low to configure up to 8 devices on same bus.
SDA	Serial Data I/O	Open-drain bidirectional line; requires external pull-up; carries address, command, and data bytes.
SCL	Serial Clock Input	Master-generated clock; synchronizes all data transfers; rising edge samples SDA, falling edge drives SDA.
WC	Write Control Input	Hardware write lock: high = full array write disabled; low or floating = write enabled.
VCC	Supply Voltage	1.7–5.5 V DC input; decoupling capacitor (10–100 nF) required near pins for stable internal charge pump operation.
VSS	Ground Reference	Return path for VCC and all internal logic; must be low-impedance connection to minimize noise coupling.

Key Features

Feature	Design Value
Triple-voltage-range operation	Supports 1.7–5.5 V supply - eliminates need for separate voltage regulators in mixed-voltage systems.
Hardware write protect (WC)	Pin-level disable of all write operations - prevents corruption during brown-out or firmware update sequences.
ECC per 4-byte group	Single-bit error correction on read - improves data integrity in electrically noisy industrial environments.
Identification page (M24256-D variant)	64-byte dedicated page with permanent lock capability - stores factory-trusted keys or calibration certificates.
ECOPACK2 packaging	RoHS-compliant, halogen-free materials - meets global environmental compliance requirements for export and OEM programs.

Applications

Industrial Sensor Calibration

Smart Meter Firmware Storage

Use Scenario: Storing temperature, pressure, and offset coefficients for factory-calibrated industrial transmitters.

IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed via I²C during power-up initialization and periodic self-test.

Use Value: Enables field-replaceable sensor modules with unique calibration data preserved across 200+ years without battery backup.

Use Scenario: Holding firmware patch metadata, tariff tables, and cryptographic keys in utility-grade electricity meters.

IC Role / Device Role / Timing Role: Secure boot-time configuration store interfaced to metering SoC over isolated I²C bus.

Use Value: Supports remote firmware updates with verified signature storage and write-lock protection against tampering.

PLC I/O Module Configuration

Medical Diagnostic Device Settings

Use Scenario: Retaining channel-specific gain, filter, and scaling settings for modular programmable logic controller analog input cards.

IC Role / Device Role / Timing Role: Persistent configuration memory mapped into microcontroller's I²C peripheral address space.

Use Value: Allows hot-swap I/O modules to retain calibrated settings without reprogramming after replacement.

Use Scenario: Saving user-adjusted contrast, brightness, and diagnostic thresholds in portable ultrasound imaging units.

IC Role / Device Role / Timing Role: Low-power, high-reliability storage for clinical settings where data loss is unacceptable.

Use Value: Guarantees >200-year retention of FDA-required operational parameters under continuous thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C256-10PU-2.7	256 Kbit I²C EEPROM, 2.7–5.5 V supply, no WC pin, max 400 kHz clock	Lacks hardware write control and 1 MHz support; lower voltage floor limits use in 1.8 V systems	Select when cost sensitivity outweighs need for 1.7 V operation or hardware write lock.
BR24G256FJ-WE2	256 Kbit I²C EEPROM, 1.6–5.5 V, built-in write protect register, 1 MHz capable	Software-configurable WP register instead of dedicated WC pin; different pinout (SOP8)	Prefer when system-level write protection policy is dynamic and managed by host firmware.

Compared with AT24C256-10PU-2.7 and BR24G256FJ-WE2, M24256-BFDW6TP uniquely combines 1.7 V minimum supply, dedicated hardware WC pin, and TSSOP8 ECOPACK2 packaging - making it optimal for space-constrained, low-voltage industrial designs requiring deterministic write inhibition.

Availability

M24256-BFDW6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and PLC I/O module configuration requiring stable component supply across extended product lifecycles.

Supply support for M24256-BFDW6TP 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 harsh industrial and metering environments with stringent longevity and reliability demands.

FAQ

What is the function of the WC pin on M24256-BFDW6TP?

The WC (Write Control) pin is a hardware-level enable/disable input for all write operations. When driven high, it disables writes to the entire memory array regardless of I²C commands; when low or floating, writes are permitted. This prevents accidental overwrites during power transitions or firmware glitches, and does not affect read operations.

Does M24256-BFDW6TP support 1 MHz I²C operation across its full voltage range?

Yes - M24256-BFDW6TP supports 1 MHz I²C clock frequency from 1.7 V to 5.5 V, as confirmed in DS1766 Rev 35 Section 1. This distinguishes it from many competing EEPROMs that limit high-speed operation to ≥2.5 V or ≥3.0 V supplies.

How does the ECC feature operate, and does it impact write endurance?

ECC corrects single-bit errors per 4-byte group during reads, using transparent internal logic. During writes, all four bytes in a group are cycled together - meaning endurance is budgeted per group, not per byte. Total endurance remains >4 million cycles per group, but distributed writes across group bytes extend effective lifetime.

Is the TSSOP8 (DW) package of M24256-BFDW6TP RoHS-compliant and halogen-free?

Yes - the TSSOP8 package carries ST's ECOPACK2 designation, certifying full RoHS compliance and halogen-free construction per IEC 61249-2-21. This includes lead-free matte tin terminations and absence of brominated flame retardants in molding compounds.

M24256-BFDW6TP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 256Kbit

Memory Organization:: 32K x 8

Memory Interface:: I2C

Clock Frequency:: 1 MHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 450 ns

Voltage - Supply:: 1.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

M24256-BFDW6TP FAQ

1.How can I place an order for M24256-BFDW6TP through Aetrix?

Please submit a Request for Quotation (RFQ) for M24256-BFDW6TP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M24256-BFDW6TP reliable?

The price and inventory of M24256-BFDW6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-BFDW6TP is usually 5 days.

3.What payment methods are accepted for M24256-BFDW6TP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-BFDW6TP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M24256-BFDW6TP?

M24256-BFDW6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M24256-BFDW6TP order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M24256-BFDW6TP?

For technical support, including M24256-BFDW6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-BFDW6TP requirements.

6.How does Aetrix verify that M24256-BFDW6TP is sourced from the original manufacturer or authorized distributors?

All M24256-BFDW6TP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M24256-BFDW6TP meets industry standards.

7.What is the process for return or replacement of M24256-BFDW6TP?

All M24256-BFDW6TP units undergo pre-shipment inspection (PSI). If there is an issue with M24256-BFDW6TP, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M24256-BFDW6TP part is unused and in its original packaging.

Return procedure for M24256-BFDW6TP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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