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  • The M41T6x is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator. Eight registers are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional eight registers provide status/control of alarm, 32 kHz output, calibration, and watchdog functions. Addresses and data are transferred serially via a two-line, bidirectional I²C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

    Functions available to the user include a time-of-day clock/calendar, alarm interrupts (M41T62/65), 32 kHz output (M41T62/64), programmable square wave output (M41T62/64), and watchdog output (M41T65). The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28-, 29- (leap year), 30- and 31-day months are made automatically.
    The M41T6x is supplied in two very small packages: a tiny, 3 x 3 mm 16-pin QFN which requires a user-supplied 32 kHz crystal, and an ultra-small 1.5 x 3.2 mm LCC with embedded crystal - no external crystal is required.

    Key Features

    • Serial real-time clock (RTC) with alarm functions
      • 400 kHz I²C serial interface
      • Memory mapped registers for seconds, minutes, hours, day, date, month, year, and century
      • Tenths/hundredths of seconds register
    • 350 nA timekeeping current at 3 V
    • Timekeeping down to 1.0 V
    • 1.3 V to 4.4 V I²C bus operating voltage
      • 4.4 V max VCCsuitable for lithium-ion battery operation
    • Low operating current of 35 μA (at 400 kHz I²C speed)
    • 32 kHz square wave output is on at power-up. Suitable for driving a microcontroller in low-power mode. Can be disabled. (M41T62/64)
    • Programmable 1 Hz to 32 kHz square wave output (M41T62/64)
    • Programmable alarm with interrupt function (M41T62/65)
    • 32 kHz crystal oscillator integrates crystal load capacitors, works with high series resistance crystals
    • Oscillator stop detection monitors clock operation
    • Accurate programmable watchdog
      • 62.5 ms to 31 minutes timeout
    • Software clock calibration. Can adjust timekeeping to within ±2 parts per million (±5 seconds per month)
    • Automatic leap year compensation
    • –40 to +85 °C operation
    • Two package options:
      • Very small 3 x 3 mm, lead-free and halogen-free (ECOPACK2) 16-lead QFN
      • Ultra-small 1.5 x 3.2 mm, lead-free and halogen-free (ECOPACK2) 8-pin ceramic leadless chip carrier with embedded 32 kHz crystal - no external oscillator components required (M41T62)

Circuit Diagram

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    • Part number
      Status
      Description
      Type
      Supplier

      STSW-M41T62

      Active

      Platform-independent device driver for M41T62

      Clocks and Timers Software ST

      STSW-SRTC001

      Active

      I2C code for Serial RTC

      Clocks and Timers Software ST

      STSW-SRTC002

      Active

      SPI code -Serial RTC

      Clocks and Timers Software ST
      STSW-M41T62

      Description:

      Platform-independent device driver for M41T62
      STSW-SRTC001

      Description:

      I2C code for Serial RTC
      STSW-SRTC002

      Description:

      SPI code -Serial RTC
    • Part number
      Status
      Description
      Type
      Supplier

      STEVAL-FET001V1

      Active

      M41T62LC6F adapter board for a standard DIL 24 socket

      Process Control and Automation Solution Eval Boards ST
      STEVAL-FET001V1

      Description:

      M41T62LC6F adapter board for a standard DIL 24 socket

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STMicroelectronics - M41T62

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T62LC6F
Active
LCC8 3.2x1.5 mm Industrial Ecopack2
M41T62Q6F
Active
VFQFPN 16 3x3x0.9 Industrial Ecopack2

M41T62LC6F

Package:

LCC8 3.2x1.5 mm

Material Declaration**:

PDF XML

Marketing Status

Active

Package

LCC8 3.2x1.5 mm

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T62Q6F

Package:

VFQFPN 16 3x3x0.9

Material Declaration**:

PDF

Marketing Status

Active

Package

VFQFPN 16 3x3x0.9

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
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Budgetary Price (US$)*/Qty
More info
min
max
M41T62LC6F Available at 7 distributors

Distributor availability ofM41T62LC6F

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 2630 1 Order Now
RS COMPONENTS EUROPE 9455 5 Order Now
ARROW EUROPE 2000 0 Order Now
Newark Element14 AMERICA 97 0 Order Now
ARROW AMERICA 1000 1000 Order Now
MOUSER WORLDWIDE 12743 1 Order Now
RUTRONIK EUROPE 1000 1000 Order Now

Distributor reported inventory date: 2020-11-30

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COMPEL

Stock

2630

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

9455

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5

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2000

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0

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Stock

97

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0

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ARROW

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1000

Min.Order

1000

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AMERICA Order Now

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Stock

12743

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1

Region

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Stock

1000

Min.Order

1000

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Distributor reported inventory date: 2020-11-30

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel LCC8 3.2x1.5 mm -40 85 2.3 / 1k
MORE INFO

NVRAM size (B):

-

Country of Origin:

TAIWAN

M41T62Q6F Available at 7 distributors

Distributor availability ofM41T62Q6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14081 1 Order Now
RS COMPONENTS EUROPE 2560 1 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 9000 0 Order Now
Newark Element14 AMERICA 36 0 Order Now
MOUSER WORLDWIDE 1597 1 Order Now
Farnell Element14 EUROPE 1883 1 Order Now

Distributor reported inventory date: 2020-11-30

Distributor Name

DIGIKEY

Stock

14081

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2560

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

36

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1597

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1883

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-30

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel VFQFPN 16 3x3x0.9 -40 85 0.8 / 1k
MORE INFO

NVRAM size (B):

-

Country of Origin:

MALAYSIA

M41T62LC6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

2.3 / 1k

Distributor availability ofM41T62LC6F

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 2630 1 Order Now
RS COMPONENTS EUROPE 9455 5 Order Now
ARROW EUROPE 2000 0 Order Now
Newark Element14 AMERICA 97 0 Order Now
ARROW AMERICA 1000 1000 Order Now
MOUSER WORLDWIDE 12743 1 Order Now
RUTRONIK EUROPE 1000 1000 Order Now

Distributor reported inventory date: 2020-11-30

Distributor Name

COMPEL

Stock

2630

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

9455

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

2000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

97

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

1000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

12743

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

1000

Min.Order

1000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-30

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

LCC8 3.2x1.5 mm

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

2.3 / 1k

NVRAM size (B)

-

Country of Origin

TAIWAN

M41T62Q6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.8 / 1k

Distributor availability ofM41T62Q6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14081 1 Order Now
RS COMPONENTS EUROPE 2560 1 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 9000 0 Order Now
Newark Element14 AMERICA 36 0 Order Now
MOUSER WORLDWIDE 1597 1 Order Now
Farnell Element14 EUROPE 1883 1 Order Now

Distributor reported inventory date: 2020-11-30

Distributor Name

DIGIKEY

Stock

14081

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2560

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

36

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1597

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1883

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-30

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 3x3x0.9

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

0.8 / 1k

NVRAM size (B)

-

Country of Origin

MALAYSIA

(*) 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