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  • The M41T93 is a low-power serial SPI bus real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 package, and embedded crystal for the SOX18 package). Eight bytes of the register map are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM.

    Addresses and data are transferred serially via a serial SPI bus-compatible interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T93 has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button battery when a power failure occurs.
    Functions available to the user include a non-volatile, time-of-day clock/calendar, alarm interrupt, watchdog timer, programmable 8-bit counter, and square wave outputs. 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 M41T93 is supplied in either a QFN16 or an SOX18, 300 mil SOIC which includes an embedded 32 KHz crystal. The SOX18 package requires only a user-supplied battery to provide non-volatile operation.

    Key Features

    • Ultra-low battery supply current of 365 nA
    • Factory calibrated accuracy ±5 ppm typical after 2 reflows (SOX18) (much better accuracies are achievable using built-in programmable analog and digital calibration circuits)
    • 2.0 V to 5.5 V clock operating voltage
    • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
    • Automatic switchover and reset output circuitry (fixed reference): M41T93S: VCC= 3.0 V to 5.5 V; M41T93R: VCC= 2.7 V to 5.5 V; M41T93Z: VCC= 2.38 V to 5.50 V
    • Compatible with SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0])
    • Programmable alarm with interrupt function (valid even during battery backup mode)
    • Optional 2ndprogrammable alarm available
    • Square wave output (defaults to 32 KHz on power-up)
    • RESET (RST) output
    • Watchdog timer
    • Programmable 8-bit counter/timer
    • 7 bytes of battery-backed user SRAM
    • Battery low flag
    • Low operating current of 80 μA
    • Oscillator stop detection
    • Battery or supercapacitor backup
    • Operating temperature of –40 °C to +85 °C
    • Package options include a 16-lead QFN and an 18-lead embedded crystal SOIC

Circuit Diagram

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STMicroelectronics - M41T93

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M41T93RMY6F
Active
SO18 with embedded crystal Industrial Ecopack1
M41T93RQA6F
Active
VFQFPN 16 4x4x1.0 Industrial Ecopack2
M41T93SMY6F
Active
SO18 with embedded crystal Industrial Ecopack1
M41T93SQA6F
Active
VFQFPN 16 4x4x1.0 Industrial Ecopack2
M41T93ZMY6F
Active
SO18 with embedded crystal Industrial Ecopack1
M41T93ZQA6F
Active
VFQFPN 16 4x4x1.0 Industrial Ecopack2

M41T93RMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T93RQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T93SMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T93SQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

Grade

Industrial

RoHS Compliance Grade

Ecopack2

M41T93ZMY6F

Package:

SO18 with embedded crystal

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO18 with embedded crystal

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M41T93ZQA6F

Package:

VFQFPN 16 4x4x1.0

Material Declaration**:

Marketing Status

Active

Package

VFQFPN 16 4x4x1.0

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.

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M41T93RMY6F Available at 7 distributors

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EAR99 NEC Tape And Reel SO18 with embedded crystal -40 85 1.965 / 1k
MORE INFO

NVRAM size (B):

12

Country of Origin:

PHILIPPINES

M41T93SMY6F Available at 6 distributors

Distributor availability ofM41T93SMY6F

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1429 1 Order Now
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Distributor reported inventory date: 2020-10-28

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EAR99 NEC Tape And Reel SO18 with embedded crystal -40 85 1.965 / 1k
MORE INFO

NVRAM size (B):

12

Country of Origin:

PHILIPPINES

M41T93SQA6F Available at 3 distributors

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DIGIKEY WORLDWIDE 474 1 Order Now
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EAR99 NEC Tape And Reel VFQFPN 16 4x4x1.0 -40 85 1.318 / 1k
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NVRAM size (B):

12

Country of Origin:

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M41T93ZQA6F Available at 4 distributors

Distributor availability ofM41T93ZQA6F

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 718 1 Order Now
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Distributor reported inventory date: 2020-10-28

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel VFQFPN 16 4x4x1.0 -40 85 1.318 / 1k
MORE INFO

NVRAM size (B):

12

Country of Origin:

MALAYSIA

M41T93RQA6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.318 / 1k

Distributor availability ofM41T93RQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1408 1 Order Now
AVNET AMERICA 354 0 Order Now
ARROW EUROPE 1000 0 Order Now
ARROW AMERICA 3000 1000 Order Now
MOUSER WORLDWIDE 1453 1 Order Now
Farnell Element14 EUROPE 837 1 Order Now

Distributor reported inventory date: 2020-10-28

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1408

Min.Order

1

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WORLDWIDE Order Now

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Stock

354

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0

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AMERICA Order Now

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Stock

1000

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Stock

3000

Min.Order

1000

Region

AMERICA Order Now

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Stock

1453

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

837

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 4x4x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.318 / 1k

NVRAM size (B)

12

Country of Origin

MALAYSIA

M41T93ZMY6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.965 / 1k

Distributor availability ofM41T93ZMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 827 1 Order Now
MOUSER WORLDWIDE 400 1 Order Now
Farnell Element14 EUROPE 767 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

827

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

400

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

767

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO18 with embedded crystal

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.965 / 1k

NVRAM size (B)

12

Country of Origin

PHILIPPINES

M41T93RMY6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.965 / 1k

Distributor availability ofM41T93RMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5390 1 Order Now
RS COMPONENTS EUROPE 1830 1 Order Now
AVNET AMERICA 2000 0 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 1000 1000 Order Now
MOUSER WORLDWIDE 2589 1 Order Now
Farnell Element14 EUROPE 651 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

5390

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1830

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

2000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

1000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

2589

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

651

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO18 with embedded crystal

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.965 / 1k

NVRAM size (B)

12

Country of Origin

PHILIPPINES

M41T93SMY6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.965 / 1k

Distributor availability ofM41T93SMY6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1429 1 Order Now
COMPEL EUROPE 30 1 Order Now
AVNET AMERICA 6000 0 Order Now
ARROW EUROPE 1000 0 Order Now
MOUSER WORLDWIDE 784 1 Order Now
Farnell Element14 EUROPE 773 1 Order Now

Distributor reported inventory date: 2020-10-28

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DIGIKEY

Stock

1429

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

30

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

784

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

773

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO18 with embedded crystal

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.965 / 1k

NVRAM size (B)

12

Country of Origin

PHILIPPINES

M41T93SQA6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.318 / 1k

Distributor availability ofM41T93SQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 474 1 Order Now
ARROW AMERICA 75 1 Order Now
MOUSER WORLDWIDE 1148 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

474

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

75

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1148

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 4x4x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.318 / 1k

NVRAM size (B)

12

Country of Origin

MALAYSIA

M41T93ZQA6F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.318 / 1k

Distributor availability ofM41T93ZQA6F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 718 1 Order Now
ARROW AMERICA 7 1 Order Now
MOUSER WORLDWIDE 1917 1 Order Now
Farnell Element14 EUROPE 975 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

718

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

7

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

1917

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

975

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFQFPN 16 4x4x1.0

Operating Temperature (°C)

(min)

-40

(max)

85

Budgetary Price (US$)* / Qty

1.318 / 1k

NVRAM size (B)

12

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