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Real Time Clock

Real Time Clocks are in stock with same-day shipping at Mouser from industry leading manufacturers. Mouser is an authorized distributor for many real time clock manufacturers including Analog Devices, Epson, Microchip, Micro Crystal, NXP, Renesas Electronics, STMicroelectronics & more.
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Please view our large selection of real time clocks below.

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Part #

Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD

ISL1208IB8Z
Renesas / Intersil
1: $2.95
801In Stock
1,200Expected 2026/12/25

Mfr. Part No.
ISL1208IB8Z

Mouser Part No
968-ISL1208IB8Z

Renesas / Intersil

Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD

Datasheet

801In Stock

1,200Expected 2026/12/25

$2.95

$2.16

$1.98

$1.78

View

Min.: 1
Mult.: 1

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

2 B

SOIC-8

Backup Switching

2.7 V

5.5 V

- 40 C

+ 85 C

ISL1208

SMD/SMT

Tube

Real Time Clock REAL TIME CLKRTC IN

ISL1219IUZ
Renesas / Intersil
1: $4.08
64In Stock
980Expected 2026/09/11

Mfr. Part No.
ISL1219IUZ

Mouser Part No
968-ISL1219IUZ

Renesas / Intersil

Real Time Clock REAL TIME CLKRTC IN

Datasheet

64In Stock

980Expected 2026/09/11

$4.08

$3.08

$2.83

$2.64

View

Min.: 1
Mult.: 1

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

2 B

MSOP-10

Backup Switching

2.7 V

5.5 V

- 40 C

+ 85 C

ISL1219

SMD/SMT

Tube

Real Time Clock RTC I2c Serial IC 1.8 to 5.5V 32kHz

1337AGDVGI
Renesas Electronics
1: $2.90
7In Stock
768Expected 2027/12/13

Mfr. Part No.
1337AGDVGI

Mouser Part No
972-1337AGDVGI

Renesas Electronics

Real Time Clock RTC I2c Serial IC 1.8 to 5.5V 32kHz

Datasheet

7In Stock

768Expected 2027/12/13

$2.90

$2.17

Min.: 1
Mult.: 1

MSOP-8

1337AGD

SMD/SMT

Tube

Real Time Clock .9RTC BASE

1338-31DCGI8
Renesas Electronics
1: $3.93
69In Stock
6,000Expected 2027/12/13

Mfr. Part No.
1338-31DCGI8

Mouser Part No
972-1338-31DCGI8

Renesas Electronics

Real Time Clock .9RTC BASE

Datasheet

69In Stock

6,000Expected 2027/12/13

Cut Tape

$3.93

$2.93

$2.67

$2.41

View

Reel

$2.24

MouseReel Available

Min.: 1
Mult.: 1

: 3,000

Serial 2-Wire, I2C

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

56 B

SOIC-8

Backup Switching

1.3 V

3.7 V

- 40 C

+ 85 C

1338

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock Automotive tiny Real-Time Clock/calendar with alarm function and I2C-bus

PCA85063ATT/AJ
NXP Semiconductors
1: $1.59
29In Stock
12,500On Order
NRND

Mfr. Part No.
PCA85063ATT/AJ

Mouser Part No
771-PCA85063ATT/AJ

NRND

NXP Semiconductors

Real Time Clock Automotive tiny Real-Time Clock/calendar with alarm function and I2C-bus

Datasheet

29In Stock

12,500On Order

Cut Tape

$1.59

$1.16

$1.06

$0.90

View

Reel

$0.77

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

I2C

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

TSSOP-8

No Backup Switching

900 mV

5.5 V

- 40 C

+ 105 C

PCA85063A

SMD/SMT

AEC-Q100

Reel, Cut Tape, MouseReel

Real Time Clock 2-Wire Real Time Clock IC

R2051L01-E2
Nisshinbo
1: $1.60
79In Stock

Mfr. Part No.
R2051L01-E2

Mouser Part No
848-R2051L01-E2

Nisshinbo

Real Time Clock 2-Wire Real Time Clock IC

Datasheet

79In Stock

Cut Tape

$1.60

$1.17

$1.07

$0.944

Reel

$0.766

View

MouseReel Available

Min.: 1
Mult.: 1

: 3,000

Serial 2-Wire, I2C

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

QFN023023-16

Backup Switching

750 mV

5.5 V

- 40 C

+ 85 C

R2051L

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock RTC IC with 114x8 NV SRAM

BQ3285S-SB2
Texas Instruments
1: $16.84
20In Stock
End of Life

Mfr. Part No.
BQ3285S-SB2

Mouser Part No
595-BQ3285S-SB2

End of Life

Texas Instruments

Real Time Clock RTC IC with 114x8 NV SRAM

Datasheet

20In Stock

$16.84

$13.37

$12.50

$11.90

View

Min.: 1
Mult.: 1

Multiplexed

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

114 B

SOIC-24

Backup Switching

4.5 V

5.5 V

0 C

+ 70 C

BQ3285

SMD/SMT

Tube

Real Time Clock Parallel RTC A 595-B Q4802YDWR A 595-BQ4 A 595-BQ4802YDWR

BQ4802YDW
Texas Instruments
1: $25.56
7In Stock
End of Life

Mfr. Part No.
BQ4802YDW

Mouser Part No
595-BQ4802YDW

End of Life

Texas Instruments

Real Time Clock Parallel RTC A 595-B Q4802YDWR A 595-BQ4 A 595-BQ4802YDWR

Datasheet

7In Stock

$25.56

$20.43

$18.45

$17.89

View

Min.: 1
Mult.: 1

Parallel

YY-MM-DD-dd

HH:MM:SS (24 hr)

16 B

SOIC-28

Backup Switching

4.5 V

5.5 V

0 C

+ 70 C

BQ4802Y

SMD/SMT

Tube

Real Time Clock Real Time Clock MSOP-8 T&R 2.5K

PT7C433833AUEX
Diodes Incorporated
1: $1.48
2,103In Stock
Factory Special Order

Mfr. Part No.
PT7C433833AUEX

Mouser Part No
729-PT7C433833AUEX

Factory Special Order

Diodes Incorporated

Real Time Clock Real Time Clock MSOP-8 T&R 2.5K

Learn More

Datasheet

2,103In Stock

Cut Tape

$1.48

$1.08

$0.984

$0.873

Reel

View

Min.: 1
Mult.: 1

: 2,500

Serial 2-Wire, I2C

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

56 B

Backup Switching

2.7 V

5.5 V

- 40 C

+ 85 C

SMD/SMT

Reel, Cut Tape

Real Time Clock RX4901CE XS D0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-3ppm 2k TR

RX4901CE XS D06
Epson Timing
1: $5.93
1,922In Stock

Mfr. Part No.
RX4901CE XS D06

Mouser Part No
732-RX4901CEXSD06

Epson Timing

Real Time Clock RX4901CE XS D0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-3ppm 2k TR

Learn More

Datasheet

1,922In Stock

Cut Tape

$5.93

$4.54

$4.18

$3.80

Reel

$3.26

View

MouseReel Available

Min.: 1
Mult.: 1

: 2,000

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

256 B

Backup Switching

1.6 V

5.5 V

- 40 C

+ 105 C

RX4901CE

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock RX8901CE XS B0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-3ppm 2k TR

RX8901CE XS B06
Epson Timing
1: $6.04
40In Stock
2,000Expected 2026/10/21

Mfr. Part No.
RX8901CE XS B06

Mouser Part No
732-RX8901CEXSB06

Epson Timing

Real Time Clock RX8901CE XS B0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-3ppm 2k TR

Learn More

Datasheet

40In Stock

2,000Expected 2026/10/21

Cut Tape

$6.04

$4.62

$4.27

$3.80

$3.66

Reel

$3.42

MouseReel Available

Min.: 1
Mult.: 1

: 2,000

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

No Backup Switching

1.6 V

5.5 V

- 40 C

+ 105 C

RX8901CE

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock Low Power High Stability 5 ppm -40 - +85C IC Real Time Clock 3.2 x 2.5 mm

ECS-RTC-3225-5699HS-TR
ECS
1: $5.68
783In Stock

Mfr. Part No.
ECS-RTC-3225-5699HS-TR

Mouser Part No
520-RTC-32255699HSTR

ECS

Real Time Clock Low Power High Stability 5 ppm -40 - +85C IC Real Time Clock 3.2 x 2.5 mm

Learn More

Datasheet

783In Stock

Cut Tape

$5.68

$4.33

$3.99

$3.62

Reel

$3.30

View

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

I2C

YY-MM-DD

HH:MM:SS (24 hr)

Backup Switching

1.6 V

5 V

- 40 C

+ 85 C

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock 1024k NV SRAM with Phantom Clock

DS1248WP-120+
Analog Devices / Maxim Integrated
1: $62.42
3In Stock

Mfr. Part No.
DS1248WP-120+

Mouser Part No
700-DS1248WP-120

Analog Devices / Maxim Integrated

Real Time Clock 1024k NV SRAM with Phantom Clock

Datasheet

3In Stock

$62.42

$51.57

$47.76

$47.75

Min.: 1
Mult.: 1

Parallel

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

128 kB

PowerCap Module-34

Backup Switching

2.97 V

3.63 V

0 C

+ 70 C

DS1248WP

SMD/SMT

Tray

Real Time Clock Low-Current I C RTCs for High-ESR Crystals

DS1341T+T&R
Analog Devices / Maxim Integrated
1: $4.42
156In Stock

Mfr. Part No.
DS1341T+T&R

Mouser Part No
700-DS1341T+T&R

Analog Devices / Maxim Integrated

Real Time Clock Low-Current I C RTCs for High-ESR Crystals

Learn More

Datasheet

156In Stock

Cut Tape

$4.42

$3.34

$3.06

$2.77

View

Reel

$2.38

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

Serial 2-Wire, I2C

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

TDFN-EP-8

No Backup Switching

1.8 V

5.5 V

- 40 C

+ 85 C

DS1341T

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock RX-4045SA:AA0 PURE SN 5+/-5PPM 1K T/R

RX-4045SAAA0 PURE SN
Epson Timing
1: $4.70
1,516In Stock

Mfr. Part No.
RX-4045SAAA0 PURE SN

Mouser Part No
732-R4045SAAA0PURESN

Epson Timing

Real Time Clock RX-4045SA:AA0 PURE SN 5+/-5PPM 1K T/R

Learn More

Datasheet

1,516In Stock

Cut Tape

$4.70

$3.56

$3.27

$2.97

Reel

$2.72

View

Min.: 1
Mult.: 1

: 1,000

Serial 4-Wire

YY-MM-DD-dd

HH:MM:SS (24 hr)

No Backup Switching

1.7 V

5.5 V

- 40 C

+ 85 C

SMD/SMT

Reel, Cut Tape

Real Time Clock RX-4045SA:AA3 PURE SN 5+/-5PPM 250 T/R

RX-4045SAAA3 PURE SN
Epson Timing
1: $9.57
915In Stock

Mfr. Part No.
RX-4045SAAA3 PURE SN

Mouser Part No
732-RX-4045SA:AA3S

Epson Timing

Real Time Clock RX-4045SA:AA3 PURE SN 5+/-5PPM 250 T/R

Datasheet

915In Stock

Cut Tape

$9.57

$7.45

$6.34

$5.91

Reel

$5.64

View

MouseReel Available

Min.: 1
Mult.: 1

: 250

Serial 4-Wire

YY-MM-DD-dd

HH:MM:SS (24 hr)

SOP-14

No Backup Switching

1.7 V

5.5 V

- 40 C

+ 85 C

RX-4045SA

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock REAL TIME CLOCK 3.0V 5+/-23PPM 1K TR

RX6110SA:B0 PURE SN
Epson Timing
1: $1.63
1,562In Stock

Mfr. Part No.
RX6110SA:B0 PURE SN

Mouser Part No
732-RX6110SAB0PURESN

Epson Timing

Real Time Clock REAL TIME CLOCK 3.0V 5+/-23PPM 1K TR

Datasheet

1,562In Stock

Cut Tape

$1.63

$1.33

$1.26

$1.19

$1.17

Reel

$1.17

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

Serial, I2C, SPI

YY-MM-DD-dd

HH:MM:SS (24 hr)

16 B

Backup Switching

1.6 V

5.5 V

- 40 C

+ 85 C

RX6110SA

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock 32.768kHz 5ppm I2C-Bus

RX8130CE B0
Epson Timing
1: $1.40
6,944In Stock
16,000Expected 2026/11/03

Mfr. Part No.
RX8130CE B0

Mouser Part No
732-RX8130CEB0

Epson Timing

Real Time Clock 32.768kHz 5ppm I2C-Bus

Datasheet

6,944In Stock

16,000Expected 2026/11/03

Cut Tape

$1.40

$1.00

$0.905

$0.80

Reel

$0.686

View

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

Serial 2-Wire, I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

Backup Switching

1.25 V

5.5 V

- 40 C

+ 85 C

RX8130CE

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock 32.768kHz-DTCXO 3.4ppm I2C-Bus

RX8900CE UA3
Epson Timing
1: $9.78
914In Stock

Mfr. Part No.
RX8900CE UA3

Mouser Part No
732-RX8900CEUA3

Epson Timing

Real Time Clock 32.768kHz-DTCXO 3.4ppm I2C-Bus

Learn More

Datasheet

Product Comments

914In Stock

Cut Tape

$9.78

$7.62

$7.07

$6.47

Reel

$6.14

View

MouseReel Available

Min.: 1
Mult.: 1

: 250

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

Backup Switching

2.5 V

5.5 V

- 40 C

+ 85 C

RX8900CE

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock Clock VCXO

PT7C433833AZEEX
Diodes Incorporated
1: $1.47
1,477In Stock
Factory Special Order

Mfr. Part No.
PT7C433833AZEEX

Mouser Part No
729-PT7C433833AZEEX

Factory Special Order

Diodes Incorporated

Real Time Clock Clock VCXO

Learn More

Datasheet

1,477In Stock

Cut Tape

$1.47

$1.06

$0.958

$0.847

Reel

View

Min.: 1
Mult.: 1

: 3,000

I2C

YY-MM-DD-dd

HH:MM:SS:hh (12 hr, 24 hr)

56 B

TDFN-8

Backup Switching

2.7 V

5.5 V

- 40 C

+ 85 C

SMD/SMT

Reel, Cut Tape

Real Time Clock Real Time Clock

PT7C4363BWEX
Diodes Incorporated
1: $1.23
1,769In Stock
Factory Special Order

Mfr. Part No.
PT7C4363BWEX

Mouser Part No
729-PT7C4363BWEX

Factory Special Order

Diodes Incorporated

Real Time Clock Real Time Clock

Learn More

Datasheet

1,769In Stock

Cut Tape

$1.23

$0.885

$0.801

$0.707

Reel

View

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

SOIC-8

No Backup Switching

1.3 V

5.5 V

- 40 C

+ 85 C

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock RX4901CE XB D0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR

RX4901CE XB D06
Epson Timing
1: $4.51
238In Stock

Mfr. Part No.
RX4901CE XB D06

Mouser Part No
732-RX4901CEXBD06

Epson Timing

Real Time Clock RX4901CE XB D0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR

Learn More

Datasheet

238In Stock

Cut Tape

$4.51

$3.41

$3.13

$2.83

Reel

$2.36

View

MouseReel Available

Min.: 1
Mult.: 1

: 2,000

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

256 B

Backup Switching

1.6 V

5.5 V

- 40 C

+ 105 C

RX4901CE

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock RX-8803LC:UB PURE SN I2C-BUS RTC +/-5.0PPM-40 85C VSOJ-12 PIN BULK

RX-8803LCUB PURE SN BULK
Epson Timing
1: $11.68
5In Stock

Mfr. Part No.
RX-8803LCUB PURE SN BULK

Mouser Part No
732-8803LCUBPRSNBULK

Epson Timing

Real Time Clock RX-8803LC:UB PURE SN I2C-BUS RTC +/-5.0PPM-40 85C VSOJ-12 PIN BULK

Learn More

Datasheet

5In Stock

$11.68

$8.40

$8.11

$7.78

View

Min.: 1
Mult.: 1

Serial 2-Wire, I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

No Backup Switching

1.6 V

5.5 V

- 40 C

+ 85 C

RX-8803LC

SMD/SMT

Bulk

Real Time Clock I2C Bus 5 +/-23ppm

RX-8025SA:AA0
Epson Timing
1: $4.16
64In Stock
1,000Expected 2026/10/05

Mfr. Part No.
RX-8025SA:AA0

Mouser Part No
732-RX-8025SA:AA0

Epson Timing

Real Time Clock I2C Bus 5 +/-23ppm

Learn More

Datasheet

64In Stock

1,000Expected 2026/10/05

Cut Tape

$4.16

$3.15

$2.90

$2.62

View

Reel

$2.34

MouseReel Available

Min.: 1
Mult.: 1

: 1,000

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

SOP-14

No Backup Switching

1.7 V

5.5 V

- 40 C

+ 85 C

RX-8025SA

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock 32.768KHz 3.0Volts 5+/-5ppm -40C +85C

RX-8025SA:AA3
Epson Timing
1: $8.61
114In Stock
500Expected 2026/11/10

Mfr. Part No.
RX-8025SA:AA3

Mouser Part No
732-RX-8025SA:AA3

Epson Timing

Real Time Clock 32.768KHz 3.0Volts 5+/-5ppm -40C +85C

Learn More

Datasheet

114In Stock

500Expected 2026/11/10

Cut Tape

$8.61

$6.68

$6.19

$5.18

Reel

$4.94

MouseReel Available

Min.: 1
Mult.: 1

: 250

I2C

YY-MM-DD-dd

HH:MM:SS (24 hr)

SOP-14

No Backup Switching

1.7 V

5.5 V

- 40 C

+ 85 C

RX-8025SA

SMD/SMT

Reel, Cut Tape, MouseReel

Real Time Clock

Customer Service Office

Company

Resources

Support

2 B
3 B
4 B
7 B
8 B
10 B
12 B
16 B
20 B
31 B
32 B
56 B
64 B
96 B
113 B
114 B
128 B
160 B
236 B
242 B

3.2 mm x 2.5 mm x 1 mm
DFN-16
DFN-20
DFN2626-10
DFN-8
DIP-16
DIP-8
EDIP-24
EDIP-28
EDIP-32
HWSON-8
LGA-10
MSOP-10
MSOP-8
PCDIP-24
PCDIP-28
PDIP-16
PDIP-24
PDIP-28
PDIP-8

600 mV
750 mV
900 mV
1 V
1.1 V
1.2 V
1.25 V
1.3 V
1.4 V
1.5 V
1.6 V
1.7 V
1.71 V
1.8 V
2 V
2.2 V
2.3 V
2.38 V
2.4 V
2.5 V

1338
1339
1337AGD
AB-RTC-TA-32.768kHz-2
AB-RTC-TC-32.768kHz-2
AB-RTC-TH-32.768kHz-2
AB-RTC-XB-32.768kHz-2
AB-RTC-XL
AB-RTC-XLA
AB-RTC-XP-32.768kHz-2
AB-RTC-XPA-32.768kHz-2
AB-RTCMC
AB08x5
AB18x5
Artasie I2C
Artasie I2C w/ Power Management
Artasie SPI
Artasie SPI w/ Power Management
BQ32000
BQ32002