Real Time Clock

Real Time Clock
Real Time Clocks (RTCs) are available at Mouser Electronics 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. Please view our large selection of real time clocks below.
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Description Datasheet Availability Pricing (CAD) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model RTC Bus Interface
Date Format
Time Format
RTC Memory Size
Package / Case
Battery Backup Switching
Supply Voltage - Min
Supply Voltage - Max
Minimum Operating Temperature
Maximum Operating Temperature
Series
Mounting Style
Qualification
Packaging

STMicroelectronics Real Time Clock 128 NVRAM Serial RTC 3.0 to 3.6 Vcc
Datasheet
711In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,350

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 160 B SSOP-20 Backup Switching 2.7 V 3.6 V - 40 C + 85 C M41ST87W SMD/SMT Reel, Cut Tape, MouseReel
STMicroelectronics Real Time Clock Serial SPI bus RTC
Datasheet
1,857In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

SPI YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 32 B SOX-18 Backup Switching 2.38 V 5.5 V - 40 C + 85 C M41T93 SMD/SMT Reel, Cut Tape, MouseReel

STMicroelectronics Real Time Clock 64K (8Kx8) 70ns
Datasheet
362In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 936

Parallel YY-MM-DD-dd HH:MM:SS (24 hr) 64 kB SOX-28 Backup Switching 4.5 V 5.5 V 0 C + 70 C M48T58Y SMD/SMT Reel, Cut Tape, MouseReel
ABLIC Real Time Clock 2-wire Real Time Clock
Datasheet
5,136In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 5,000

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 7 B SNT-A-8 No Backup Switching 1.3 V 5.5 V - 40 C + 85 C S-35390 SMD/SMT Reel, Cut Tape, MouseReel
Micro Crystal Real Time Clock 32.768 kHz OPTION A TEMP COMP SPI
Datasheet
Product Comments
1,000In Stock
Min.: 1
Mult.: 1

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS (24 hr) 2 B Backup Switching 1.3 V 5.5 V - 40 C + 85 C RV-3049-C3 SMD/SMT
STMicroelectronics Real Time Clock Serial I2C bus RTC
Datasheet
2,381In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 32 B SOX-18 Backup Switching 3 V 5.5 V - 40 C + 85 C M41T83 SMD/SMT Reel, Cut Tape, MouseReel
STMicroelectronics Real Time Clock Serial I2C bus RTC
Datasheet
913In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

Serial YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 32 B Backup Switching 2.38 V 5.5 V - 40 C + 85 C M41T83 SMD/SMT Reel, Cut Tape, MouseReel

STMicroelectronics Real Time Clock Serial SPI bus RTC
Datasheet
982In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

SPI YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 32 B QFN-16 Backup Switching 3 V 5.5 V - 40 C + 85 C M41T93 SMD/SMT Reel, Cut Tape, MouseReel
Renesas / Intersil Real Time Clock REAL TIME CLK W/ ALARM & TIMR FUNCTNS
Datasheet
2,134In Stock
Min.: 1
Mult.: 1

I2C YY-MM-DD-dd HH:MM:SS (24 hr) SOIC-8 No Backup Switching 1.8 V 3.6 V - 40 C + 85 C ISL12058 SMD/SMT Tube

ABLIC Real Time Clock Real Time Clock
Datasheet
4,782In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 4,000

Serial 3-Wire YY-MM-DD-dd HH:MM:SS (24 hr) SOP-8 Backup Switching 1.3 V 5.5 V - 40 C + 85 C S-35190 SMD/SMT Reel, Cut Tape, MouseReel

ABLIC Real Time Clock Real Time Clock
Datasheet
3,950In Stock
Min.: 1
Mult.: 1
Reel: 4,000

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 7 B SOP-8 No Backup Switching 1.3 V 5.5 V - 40 C + 85 C S-35390 SMD/SMT Reel, Cut Tape
Analog Devices / Maxim Integrated Real Time Clock 256k Nonvolatile, Y2K-Compliant Timekeep
Datasheet
68In Stock
Min.: 1
Mult.: 1

Parallel YY-MM-DD-dd HH:MM:SS (24 hr) 32 kB PowerCap Module-34 Backup Switching 2.97 V 3.63 V - 40 C + 85 C DS1554WP SMD/SMT Tray

Renesas / Intersil Real Time Clock I2CAL TIME CLK/CLNDR W/EVENT DETCT 10LD
Datasheet
1,861In Stock
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 ISL1209 SMD/SMT Tube
Micro Crystal Real Time Clock 32.768kHz I2C Time Acc. 6ppm
Datasheet
482In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 8 B Backup Switching 1.3 V 5.5 V - 40 C + 85 C RV-3129 SMD/SMT Reel, Cut Tape, MouseReel

Analog Devices / Maxim Integrated Real Time Clock Phantom Time Chip
Datasheet
17In Stock
Min.: 1
Mult.: 1

Phantom Clock YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 8 B TSSOP-20 Backup Switching 4.5 V 5.5 V 0 C + 70 C DS1315E SMD/SMT Tube

Analog Devices / Maxim Integrated Real Time Clock 3V/5V Real-Time Clocks
Datasheet
60In Stock
Min.: 1
Mult.: 1

Multiplexed YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 2 kB SO-24 Backup Switching 4.5 V 5.5 V - 40 C + 85 C DS17285SN SMD/SMT Tube
Analog Devices / Maxim Integrated Real Time Clock I C 32-Bit Binary Counter RTC
Datasheet
99In Stock
Min.: 1
Mult.: 1

Serial 2-Wire, I2C Binary Binary SOIC-8 Backup Switching 1.8 V 2.2 V - 40 C + 85 C DS1672S SMD/SMT Tube
Micro Crystal Real Time Clock RV-3029-C3, Real-Time Clock, I C-bus, B Stability, 25ppm @ -40 to +85C (SMD 3.7 x 2.5 x 0.9)
Datasheet
494In Stock
850Expected 2026-02-27
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1,000

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS (24 hr) 2 B Backup Switching 1.3 V 5.5 V - 40 C + 85 C RV-3029-C3 SMD/SMT Reel, Cut Tape, MouseReel
Nisshinbo Real Time Clock 2-Wire Real Time Clock IC
Datasheet
9In Stock
2,000Expected 2026-04-21
MouseReel Available
Min.: 1
Mult.: 1
Reel: 2,000

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 16 B SSOP-8 Backup Switching 2 V 6 V - 40 C + 85 C RS5C372 SMD/SMT Reel, Cut Tape, MouseReel
Nisshinbo Real Time Clock 4-wire Serial Interface
Datasheet
10,295In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 2,000

Serial 4-Wire YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 16 B SSOP-10 Backup Switching 2 V 5.5 V - 40 C + 85 C RS5C348 SMD/SMT Reel, Cut Tape, MouseReel

Analog Devices / Maxim Integrated Real Time Clock I C RTC with Trickle Charger
Datasheet
290In Stock
Min.: 1
Mult.: 1

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS (24 hr) uSOP-8 Backup Switching 1.71 V 1.89 V - 40 C + 85 C DS1340U SMD/SMT Tube
Analog Devices / Maxim Integrated Real Time Clock Y2K-Compliant, Nonvolatile Timekeeping R
Datasheet
23In Stock
Min.: 1
Mult.: 1

Parallel YY-MM-DD-dd HH:MM:SS (24 hr) 128 kB EDIP-32 Integrated Battery 2.97 V 3.63 V - 40 C + 85 C DS1746W Through Hole Tube
NXP Semiconductors Real Time Clock Tiny Real-Time Clock RTC IC
Datasheet
20,725In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 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

Analog Devices / Maxim Integrated Real Time Clock I C RTC with 56-Byte NV RAM
Datasheet
133In Stock
Min.: 1
Mult.: 1

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 56 B SO-16 Backup Switching 2.7 V 3.3 V - 40 C + 85 C DS1338C SMD/SMT Tube

Analog Devices / Maxim Integrated Real Time Clock Low-Current SPI/3-Wire RTCs
Datasheet
2,019In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 2,500

Serial 3-Wire, SPI YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 96 B TDFN-EP-14 Backup Switching 3 V 5.5 V - 40 C + 85 C DS1344D SMD/SMT Reel, Cut Tape, MouseReel