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

STMicroelectronics M24256-DFCS6TP/K

Name: M24256-DFCS6TP/K
Brand: STMicroelectronics
SKU: M24256-DFCS6TP/K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M24256-DFCS6TP/K

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 8-UFBGA, WLCSP

Datasheet:: M24256-DFCS6TP/K.pdf

Description:: IC EEPROM 256KBIT I2C 8WLCSP

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Inventory:11,799

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Product details

Overview

M24256-DFCS6TP/K from STMicroelectronics is a 256-Kbit I²C-compatible serial EEPROM organized as 32 K × 8 bits, supporting 1 MHz clock operation across 1.7 V to 5.5 V supply. It features a 64-byte identification page with permanent lock capability, 4 million write cycles, and 200-year data retention. Used for secure parameter storage in industrial control modules requiring robust nonvolatile memory with hardware write protection.

For engineers reviewing the M24256-DFCS6TP/K datasheet, M24256-DFCS6TP/K pinout, M24256-DFCS6TP/K application, or M24256-DFCS6TP/K equivalent, key selection factors include I²C bus speed compatibility (1 MHz/400 kHz/100 kHz), extended voltage range (1.7–5.5 V), identification page locking, WC-controlled full-array write protection, and ECOPACK2-compliant TSSOP8 packaging.

Technical Context

The device operates exclusively as an I²C slave, using open-drain SDA with external pull-up and edge-triggered SCL for synchronous byte transfer. Addressing relies on three chip-enable inputs (E2–E0) to configure the 3 LSBs of the 7-bit device address, enabling up to eight devices on one bus.

It implements internal ECC across 4-byte groups for single-bit error correction during read, while write cycling is managed per group - all four bytes in a group share a cumulative 4M-cycle endurance budget. The identification page (64 bytes) uses a distinct device type identifier (1011b) and supports dedicated lock/unlock instructions.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 Kbit (32 Kbyte), organized as 32 K × 8 bits - supports firmware parameter tables and calibration data storage.
I²C clock frequency	Up to 1 MHz - enables fast configuration loading in real-time systems without bus contention delays.
Supply voltage range	1.7 V to 5.5 V - interoperable with 1.8 V logic and legacy 3.3 V/5 V microcontrollers without level shifters.
Write endurance	4 million write cycles per memory location - sufficient for daily recalibration over 10+ years in industrial logging.
Data retention	200 years at +25 °C - ensures long-term reliability in unattended infrastructure monitoring nodes.
Operating temperature	−40 °C to +85 °C - qualified for deployment in outdoor metering and factory-floor automation equipment.
Page size	64 bytes - matches typical I²C burst length limits and optimizes firmware update packet efficiency.
Identification page	64-byte dedicated area with permanent lock - stores cryptographic keys or device-specific identifiers immune to field overwrite.

Pinout & Package

Supplied in RoHS-compliant, halogen-free TSSOP8 (DW) package, 169 mil width, with exposed pad not connected. Pin 1 marked by notch or dot; pin numbering follows standard counter-clockwise layout from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
E2	Chip enable (LSB)	Configures bit b1 of 7-bit I²C address; tied high/low to select device on shared bus.
E1	Chip enable (middle)	Configures bit b2 of 7-bit I²C address; enables up to eight unique addresses per bus segment.
E0	Chip enable (MSB)	Configures bit b3 of 7-bit I²C address; floating defaults to low (0), limiting address flexibility.
SDA	Serial data I/O	Open-drain bidirectional line; requires external pull-up; supports wire-OR with other I²C slaves.
SCL	Serial clock input	Master-generated clock; rising edge samples SDA; falling edge allows SDA transition.
WC	Write control	Active-high global write protect; disables all write operations including identification page programming.
VCC	Supply voltage	1.7–5.5 V DC input; decoupling capacitor (10–100 nF) required near pins for noise immunity.
VSS	Ground reference	Return path for VCC; must be low-impedance connection to minimize ground bounce during writes.

Key Features

Feature	Design Value
1 MHz I²C interface	Enables sub-millisecond parameter reads in time-critical sensor fusion applications without protocol overhead.
Identification page with lock	64-byte dedicated region programmable once and permanently read-only - meets secure boot credential storage requirements.
Hardware write protection (WC)	Single-pin global disable of all write operations - prevents accidental corruption during power transients or firmware faults.
ECC per 4-byte group	Transparent single-bit error correction on read - eliminates need for software checksum validation in safety-critical logging.
ECOPACK2 packaging	TSSOP8 with halogen-free, RoHS-compliant materials - satisfies environmental compliance for EU/China industrial exports.
Enhanced ESD/latch-up	±4 kV HBM ESD rating and latch-up immunity per JESD78 - improves field reliability in electrostatic-prone manufacturing environments.

Applications

Smart Energy Metering

Industrial PLC I/O Modules

Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs in DIN-rail mounted electricity meters.

IC Role / Device Role / Timing Role: Nonvolatile configuration store interfaced via I²C to ARM Cortex-M4 host MCU; accessed during cold start and periodic updates.

Use Value: 200-year data retention ensures lifetime accuracy without field replacement; WC pin prevents corruption during brown-out events.

Use Scenario: Holding module identification, channel scaling coefficients, and diagnostic history in modular I/O bases.

IC Role / Device Role / Timing Role: Slave EEPROM on backplane I²C bus; read at power-on to configure FPGA-based signal conditioning logic.

Use Value: Identification page lock secures vendor-specific calibration data against unauthorized modification during maintenance.

Medical Infusion Pumps

Automotive Body Control Modules

Use Scenario: Archiving dose history, user preferences, and regulatory audit trails in Class IIa infusion devices.

IC Role / Device Role / Timing Role: Secure parameter storage accessible only after hardware authentication; write-protected except during service mode.

Use Value: 4 million write cycles support >10 years of daily usage; ECC ensures integrity of critical therapy logs.

Use Scenario: Storing seat position presets, lighting profiles, and fault-code history in BCMs with CAN/LIN interfaces.

IC Role / Device Role / Timing Role: Local configuration memory for microcontroller subsystem; updated via diagnostic session over UDS.

Use Value: −40 °C to +85 °C operation guarantees reliability under hood temperature extremes; TSSOP8 fits compact PCB layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C256-SSHL-T	256 Kbit I²C EEPROM; 1.7–5.5 V; no identification page; max 1 MHz clock; 1M write cycles.	Lacks permanent-lockable ID page and ECC; suitable for basic parameter storage without security requirements.	Select when cost sensitivity outweighs need for secure credential storage or extended endurance.
BR24G256FJ-3GE2	256 Kbit I²C EEPROM; 1.6–5.5 V; includes 64-byte ID page but no lock function; 4M cycles; 100-year retention.	Provides ID page but lacks permanent lock; retention halved vs. M24256-DF; same TSSOP8 footprint.	Choose if ID page use is temporary (e.g., field calibration) and 100-year retention suffices.

Compared with AT24C256-SSHL-T and BR24G256FJ-3GE2, the M24256-DFCS6TP/K uniquely combines permanent ID-page locking, 200-year retention, and ECC - making it optimal for medical and industrial applications where data integrity and long-term security are mandatory.

Availability

M24256-DFCS6TP/K is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC I/O modules, medical infusion pumps, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for M24256-DFCS6TP/K 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, specializing in microcontrollers, power management, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24256 series belongs to ST's serial EEPROM product line, designed specifically for secure, high-reliability nonvolatile storage in harsh-environment applications demanding extended data retention and hardware-level write protection.

FAQ

What is the function of the WC pin on M24256-DFCS6TP/K?

The WC (Write Control) pin is an active-high hardware write protect. When driven high, it disables all write operations-including byte/page writes and identification page programming-while still allowing read access. This prevents accidental or malicious memory corruption during power transitions or firmware errors, and is essential for safety-critical deployments like medical devices.

How does the identification page differ from main memory in M24256-DFCS6TP/K?

The identification page is a dedicated 64-byte region accessible via a separate I²C device address (1011b prefix). Unlike main memory, it supports a lock instruction that permanently disables further writes. Once locked, reads remain functional but no subsequent programming is possible-even with WC low-ensuring immutability of stored credentials or calibration keys.

Can M24256-DFCS6TP/K operate reliably at 1.7 V supply?

Yes. The M24256-DF variant is explicitly rated for 1.7 V minimum supply voltage across the full −40 °C to +85 °C temperature range. At 1.7 V, it maintains full 1 MHz I²C functionality, 5 ms write timing, and ECC operation. This enables direct interfacing with ultra-low-power microcontrollers without voltage translation.

Is the TSSOP8 package of M24256-DFCS6TP/K lead-free and RoHS compliant?

Yes. The M24256-DFCS6TP/K uses ST's ECOPACK2 packaging standard, which is fully RoHS-compliant and halogen-free. The TSSOP8 (DW) package meets JEDEC MS-012 standards, with lead finish qualified to IPC/JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30 °C/85% RH).

M24256-DFCS6TP/K Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-UFBGA, WLCSP

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-WLCSP

M24256-DFCS6TP/K FAQ

1.How can I place an order for M24256-DFCS6TP/K through Aetrix?

Please submit a Request for Quotation (RFQ) for M24256-DFCS6TP/K 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-DFCS6TP/K reliable?

The price and inventory of M24256-DFCS6TP/K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24256-DFCS6TP/K is usually 5 days.

3.What payment methods are accepted for M24256-DFCS6TP/K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24256-DFCS6TP/K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M24256-DFCS6TP/K?

M24256-DFCS6TP/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M24256-DFCS6TP/K 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-DFCS6TP/K?

For technical support, including M24256-DFCS6TP/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24256-DFCS6TP/K requirements.

6.How does Aetrix verify that M24256-DFCS6TP/K is sourced from the original manufacturer or authorized distributors?

All M24256-DFCS6TP/K 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-DFCS6TP/K meets industry standards.

7.What is the process for return or replacement of M24256-DFCS6TP/K?

All M24256-DFCS6TP/K units undergo pre-shipment inspection (PSI). If there is an issue with M24256-DFCS6TP/K, 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-DFCS6TP/K part is unused and in its original packaging.

Return procedure for M24256-DFCS6TP/K:

1.Submit a request within 90 days.

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

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