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  • The M24256-BW can operate with a supply voltage from 2.5 V to 5.5 V, the M24256-BR and M24256-DR can operate with a supply voltage from 1.8 V to 5.5 V, and the M24256-BF and M24256-DF can operate with a supply voltage from 1.7 V to 5.5 V. All these devices operate with a clock frequency of 1 MHz (or less), over an ambient temperature range of –40 °C / +85 °C.

    Key Features

    • Compatible with all I2C bus modes:
      • 1 MHz
      • 400 kHz
      • 100 kHz
    • Memory array:
      • 256 Kbit (32 Kbyte) of EEPROM
      • Page size: 64 byte
      • Additional Write lockable page (M24256-D order codes)
    • Single supply voltage and high speed:
      • 1 MHz clock from 1.7 V to 5.5 V
    • Write:
      • Byte Write within 5 ms
      • Page Write within 5 ms
    • Operating temperature range:
      • from -40 °C up to +85 °C
    • Random and sequential Read modes
    • Write protect of the whole memory array
    • Enhanced ESD/Latch-Up protection
    • More than 4 million Write cycles
    • More than 200-years data retention
    • Packages
      • SO8 ECOPACK2®
      • TSSOP8 ECOPACK2®
      • UFDFPN8 ECOPACK2®
      • WLCSP ECOPACK2®
      • Unsawn wafer (each die is tested)

Recommended for you

Mobile Applications

    • Part Number

      Serial EEPROMs product finder for Android and iOS

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS1766
      256-Kbit serial I²C bus EEPROM
      34.0
      838.19 KB
      PDF
      DS1766

      256-Kbit serial I²C bus EEPROM

    • Description Version Size Action
      AN4653
      Cycling endurance and data retention of high density EEPROM based on CMOS F8H process
      1.0
      267.34 KB
      PDF
      AN2014
      How a designer can make the most of STMicroelectronics Serial EEPROMs
      10.1
      1.13 MB
      PDF
      AN971
      I2C communication between ST7 and M24CXX EEPROM
      1.7
      64.48 KB
      PDF
      AN1471
      What happens to the M24xxx I²C EEPROM if the I²C bus communication is stopped?
      4.4
      72.36 KB
      PDF
      AN4653

      Cycling endurance and data retention of high density EEPROM based on CMOS F8H process

      AN2014

      How a designer can make the most of STMicroelectronics Serial EEPROMs

      AN971

      I2C communication between ST7 and M24CXX EEPROM

      AN1471

      What happens to the M24xxx I²C EEPROM if the I²C bus communication is stopped?

    • Description Version Size Action
      TN1171
      Description of UFDFPN5, UFDFPN8 and WFDFPN8 for STMicroelectronics EEPROMs and recommendations for use
      3.0
      574.55 KB
      PDF
      TN0991
      Description of WLCSP for STMicroelectronics EEPROMs and recommendations for use
      2.2
      721.8 KB
      PDF
      TN1171

      Description of UFDFPN5, UFDFPN8 and WFDFPN8 for STMicroelectronics EEPROMs and recommendations for use

      TN0991

      Description of WLCSP for STMicroelectronics EEPROMs and recommendations for use

    • Description Version Size Action
      ES0370
      M24256-BR and M24256-DF package mechanical data modifications
      1.0
      231.15 KB
      PDF
      ES0370

      M24256-BR and M24256-DF package mechanical data modifications

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      3D_MODEL_EEPROM_ALL_PACKAGES 1.0
      160.28 KB
      ZIP
      IBIS model I2C M24xxx Standard EEPROM (-40 degC to 85 degC) 4.0
      5.86 MB
      ZIP
      IBIS model SPI M95xxx Standard EEPROM (-40 degC to 85 degC) 5.0
      4.92 MB
      ZIP
      Verilog model I2C EEPROM M24XXX 2.0
      18.97 KB
      ZIP
      Verilog model SPI EEPROM M95XXX 2.2
      57.49 KB
      ZIP

      3D_MODEL_EEPROM_ALL_PACKAGES

      IBIS model I2C M24xxx Standard EEPROM (-40 degC to 85 degC)

      IBIS model SPI M95xxx Standard EEPROM (-40 degC to 85 degC)

      Verilog model I2C EEPROM M24XXX

      Verilog model SPI EEPROM M95XXX

Presentations & Training Material

    • Description Version Size Action
      EEPROM in WLCSP July 2016 1.4
      281.42 KB
      PDF
      I2C EEPROM in DFN5 small package 1.0
      555.19 KB
      PDF
      Standard Serial EEPROM presentation 1.0
      545.36 KB
      PDF
      World first 4Mbit SPI EEPROM presentation 1.0
      335.78 KB
      PDF

      EEPROM in WLCSP July 2016

      I2C EEPROM in DFN5 small package

      Standard Serial EEPROM presentation

      World first 4Mbit SPI EEPROM presentation

Publications and Collaterals

    • Description Version Size Action
      EEPROM in Ultra-small packages 1.0
      1.22 MB
      PDF
      Serial EEPROM 1.0
      1.73 MB
      PDF

      EEPROM in Ultra-small packages

      Serial EEPROM

    • Description Version Size Action
      Products and solutions for solar energy 1.0
      1.29 MB
      PDF
      Semiconductor solutions for healthcare applications 1.0
      665.18 KB
      PDF
      Smart grid distribution and smart meters - Energy-efficient solutions 2.0
      1.58 MB
      PDF

      Products and solutions for solar energy

      Semiconductor solutions for healthcare applications

      Smart grid distribution and smart meters - Energy-efficient solutions

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M24256-DFCS6TP/K
Active
WLCSP Industrial Ecopack2
M24256-DFDW6TP
Active
TSSOP8 Industrial Ecopack2
M24256-DFMC6TG
Active
UFDFPN8 Industrial Ecopack2
M24256-DFMN6TP
Active
SO8 Industrial Ecopack2

M24256-DFCS6TP/K

Package:

WLCSP

Material Declaration**:

PDF XML

Marketing Status

Active

Package

WLCSP

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M24256-DFDW6TP

Package:

TSSOP8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TSSOP8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M24256-DFMC6TG

Package:

UFDFPN8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

UFDFPN8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M24256-DFMN6TP

Package:

SO8

Material Declaration**:

Marketing Status

Active

Package

SO8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Replacement Product
Package
Packing Type
Temperature (°C) Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
min
max
M24256-DFCS6TP/K Available at 2 distributors

Distributor availability ofM24256-DFCS6TP/K

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4886 1 Order Now
Newark Element14 AMERICA 192 0 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

4886

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

192

Min.Order

0

Region

AMERICA Order Now

Distributor reported inventory date: 2020-07-06

- WLCSP Tape And Reel -40 85
Active
EAR99 SINGAPORE 0.389 / 1k
M24256-DFDW6TP Available at 4 distributors

Distributor availability ofM24256-DFDW6TP

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 12632 1 Order Now
ARROW EUROPE 12000 0 Order Now
MOUSER WORLDWIDE 3562 1 Order Now
Farnell Element14 EUROPE 7858 1 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

12632

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

12000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3562

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

7858

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-06

Get sample - TSSOP8 Tape And Reel -40 85
Active
EAR99 CHINA 0.2274 / 1k
M24256-DFMN6TP Available at 4 distributors

Distributor availability ofM24256-DFMN6TP

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4579 1 Order Now
MOUSER WORLDWIDE 8029 1 Order Now
Farnell Element14 EUROPE 2102 1 Order Now
RUTRONIK EUROPE 5000 2500 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

4579

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

8029

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2102

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

5000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-06

Get sample - SO8 Tape And Reel -40 85
Active
EAR99 CHINA 0.2075 / 1k
M24256-DFMC6TG Available at 5 distributors

Distributor availability ofM24256-DFMC6TG

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4868 1 Order Now
AVNET AMERICA 5000 0 Order Now
ARROW EUROPE 15000 0 Order Now
Newark Element14 AMERICA 1025 0 Order Now
MOUSER WORLDWIDE 6121 1 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

4868

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

5000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

1025

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6121

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-06

Get sample - UFDFPN8 Tape And Reel -40 85
Active
EAR99 PHILIPPINES 0.2621 / 1k

M24256-DFCS6TP/K

Replacement Product

-

Package

WLCSP

Budgetary Price (US$)*/Qty

0.389 / 1k

Distributor availability ofM24256-DFCS6TP/K

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4886 1 Order Now
Newark Element14 AMERICA 192 0 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

4886

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

192

Min.Order

0

Region

AMERICA Order Now

Distributor reported inventory date: 2020-07-06

Packing Type

Tape And Reel

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.389 / 1k

ECCN (US)

EAR99

Country of Origin

SINGAPORE

M24256-DFDW6TP

Replacement Product

-

Package

TSSOP8

Budgetary Price (US$)*/Qty

0.2274 / 1k

Distributor availability ofM24256-DFDW6TP

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 12632 1 Order Now
ARROW EUROPE 12000 0 Order Now
MOUSER WORLDWIDE 3562 1 Order Now
Farnell Element14 EUROPE 7858 1 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

12632

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

12000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3562

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

7858

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-06

Packing Type

Tape And Reel

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.2274 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

M24256-DFMN6TP

Replacement Product

-

Package

SO8

Budgetary Price (US$)*/Qty

0.2075 / 1k

Distributor availability ofM24256-DFMN6TP

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4579 1 Order Now
MOUSER WORLDWIDE 8029 1 Order Now
Farnell Element14 EUROPE 2102 1 Order Now
RUTRONIK EUROPE 5000 2500 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

4579

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

8029

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2102

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

5000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-06

Packing Type

Tape And Reel

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.2075 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

M24256-DFMC6TG

Replacement Product

-

Package

UFDFPN8

Budgetary Price (US$)*/Qty

0.2621 / 1k

Distributor availability ofM24256-DFMC6TG

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4868 1 Order Now
AVNET AMERICA 5000 0 Order Now
ARROW EUROPE 15000 0 Order Now
Newark Element14 AMERICA 1025 0 Order Now
MOUSER WORLDWIDE 6121 1 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

4868

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

5000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

1025

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

6121

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-06

Packing Type

Tape And Reel

Operating Temperature (°C)

(min)

-40

(max)

85

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.2621 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors