Real Time Clocks for Thermostats

Real Time Clocks (RTCs) are IC devices that keep track of time. A typical RTC can provide the time of day as well as the date via a serial bus such as I2C or SPI

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Description Datasheet Availability Pricing (CHF) 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
Packaging
Analog Devices / Maxim Integrated Real Time Clock I C Serial Real-Time Clock
Datasheet
1’309In Stock
Min.: 1
Mult.: 1

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) uSOP-8 Backup Switching 2.7 V 3.3 V - 40 C + 85 C DS1339U SMD/SMT Tube
Microchip Technology Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID
Datasheet
2’260In Stock
Min.: 1
Mult.: 1

I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 64 B MSOP-8 Backup Switching 1.8 V 5.5 V - 40 C + 85 C SMD/SMT Tube

STMicroelectronics Real Time Clock 128 NVRAM Serial RTC 3.0 to 3.6 Vcc
Datasheet
415In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 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
Analog Devices / Maxim Integrated Real Time Clock I C Serial Real-Time Clock
Datasheet
790In Stock
1’000Expected 8/14/2026
Min.: 1
Mult.: 1
Max.: 100

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) uSOP-8 Backup Switching 2.97 V 5.5 V - 40 C + 85 C DS1339U SMD/SMT Tube

NXP Semiconductors Real Time Clock RTC IC with 400 kHz I2C interface in TSSOP8 package.
Datasheet
4’709In Stock
7’500Expected 11/16/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2’500

I2C YY-MM-DD-dd HH:MM:SS (24 hr) TSSOP-8 No Backup Switching 1 V 5.5 V - 40 C + 85 C PCF8563 SMD/SMT Reel, Cut Tape, MouseReel
Microchip Technology Real Time Clock I2C GP RTCC 64B SRAM
Datasheet
440In Stock
1’800Expected 8/10/2026
Min.: 1
Mult.: 1

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 64 B MSOP-8 Backup Switching 1.8 V 5.5 V - 40 C + 85 C SMD/SMT Tube
Microchip Technology Real Time Clock I2C GP RTCC 64B SRAM
Datasheet
301In Stock
500Expected 10/26/2026
Min.: 1
Mult.: 1

Serial 2-Wire, I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 64 B TSSOP-8 Backup Switching 1.8 V 5.5 V - 40 C + 85 C SMD/SMT Tube
Microchip Technology Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID
Datasheet
954In Stock
Min.: 1
Mult.: 1

I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 64 B TSSOP-8 Backup Switching 1.8 V 5.5 V - 40 C + 85 C SMD/SMT Tube
Texas Instruments Real Time Clock Parallel RTC A 595-B Q4802LYPWR A 595-BQ A 595-BQ4802LYPWR
Datasheet
53In Stock
Min.: 1
Mult.: 1

Parallel YY-MM-DD-dd HH:MM:SS (24 hr) 16 B TSSOP-28 Backup Switching 2.7 V 3.6 V 0 C + 70 C BQ4802LY SMD/SMT Tube
Analog Devices / Maxim Integrated Real Time Clock I C Serial Real-Time Clock
Datasheet
242In Stock
Min.: 1
Mult.: 1

I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) uSOP-8 No Backup Switching 1.8 V 5.5 V - 40 C + 85 C DS1337U SMD/SMT Tube
Analog Devices / Maxim Integrated Real Time Clock I C RTC with 56-Byte NV RAM
Datasheet
99In Stock
200Expected 10/26/2026
Min.: 1
Mult.: 1

I2C YY-MM-DD-dd HH:MM:SS:hh (12 hr, 24 hr) 56 B uSOP-8 Backup Switching 3 V 5.5 V - 40 C + 85 C DS1338U SMD/SMT Tube
Analog Devices / Maxim Integrated Real Time Clock I C RTC with Trickle Charger
Datasheet
159In Stock
100Expected 8/14/2026
Min.: 1
Mult.: 1

I2C YY-MM-DD-dd HH:MM:SS (24 hr) uSOP-8 Backup Switching 2.97 V 5.5 V - 40 C + 85 C DS1340U SMD/SMT Tube