Real Time Clocks

Manufacturer Series Package/Case Packaging Product Status Programmable Type Features Memory Size Time Format Date Format Interface Voltage - Supply Voltage - Supply, Battery Current - Timekeeping (Max) Operating Temperature Mounting Type Grade Qualification Supplier Device Package

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Real Time Clock (RTC) ICs are timing components used to maintain accurate time and calendar information in electronic systems, even when the main power is turned off. They are widely used in embedded systems, industrial control, consumer electronics, communication equipment, medical devices, automotive electronics, IoT products, meters and data logging applications.

This category includes real time clock ICs, battery-backed RTCs, low-power RTCs, I2C RTCs, SPI RTCs, calendar clock ICs and related clock/timing components. These devices are commonly selected based on timekeeping accuracy, backup power support, interface type, alarm functions, operating voltage, current consumption, package type and application requirements.

TomatoElec supplies original Real Time Clock RTC ICs from recognized semiconductor manufacturers such as Microchip, NXP, STMicroelectronics, Renesas, Texas Instruments, Analog Devices, onsemi, Infineon and other major brands. As an in-stock electronic components supplier and independent distributor, TomatoElec provides inventory support, original component sourcing and BOM sourcing services for global customers.

Photo Mfr. Part # Availability Price Quantity Datasheet Series Package/Case Packaging Product Status Programmable Type Features Memory Size Time Format Date Format Interface Voltage - Supply Voltage - Supply, Battery Current - Timekeeping (Max) Operating Temperature Mounting Type Grade Qualification Supplier Device Package
HC8825K

HC8825K

compatible with 8025T Built-in c

Suzhou Hangjing Elec&Tech Co.,Ltd

79,123 -
RFQ
HC8825K

Datasheet

* 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V - 1.2µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
STK17TA8-RF35

STK17TA8-RF35

REAL TIME CLOCK, CMOS, PDSO48

Simtek

280 -
RFQ
STK17TA8-RF35

Datasheet

* - Bulk Active Not Verified - - - - - - - - - - - - - -
DP8573AVX/NOPB

DP8573AVX/NOPB

IC RTC CLK/CALENDAR PAR 28PLCC

National Semiconductor

450 -
RFQ
DP8573AVX/NOPB

Datasheet

- 28-LCC (J-Lead) Bulk Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.2V ~ 5.1V 1µA @ 5V -40°C ~ 85°C Surface Mount - - 28-PLCC (11.51x11.51)
ICM7170AIDG

ICM7170AIDG

ICM7170 - REAL TIME CLOCK, CMOS

Rochester Electronics, LLC

278 -
RFQ
ICM7170AIDG

Datasheet

- - Bulk Active Not Verified Clock/Calendar Alarm - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd - 1.9V, 2.6V ~ 5.5V 2.8V ~ 3.5V 20µA @ 5V -40°C ~ 85°C (TA) - - - -
MCP79400-I/MS

MCP79400-I/MS

IC RTC CLK/CALENDAR I2C 8MSOP

Microchip Technology

628 -
RFQ
MCP79400-I/MS

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Unique ID 64B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 5.5V 1.2µA (Typ) @ 3.3V -40°C ~ 85°C Surface Mount - - 8-MSOP
S-35390A-J8T1G

S-35390A-J8T1G

IC RTC CLOCK/CALENDAR I2C 8SOP

ABLIC Inc.

52 -
RFQ
S-35390A-J8T1G

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.3V ~ 5.5V - 0.93µA ~ 1.1µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOP-J
DP8573AV/NOPB

DP8573AV/NOPB

IC RTC CLK/CALENDAR PAR 28PLCC

Texas Instruments

72 -
RFQ
DP8573AV/NOPB

Datasheet

- 28-LCC (J-Lead) Tube Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.2V ~ 5.1V 1µA @ 5V -40°C ~ 85°C Surface Mount - - 28-PLCC (11.51x11.51)
DS1687-3IND+

DS1687-3IND+

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

55 -
RFQ
DS1687-3IND+

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 3V -40°C ~ 85°C Through Hole - - 24-EDIP
DS1511Y+

DS1511Y+

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1511Y+

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K 256B HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 5mA @ 4.5V ~ 5.5V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1744-70IND+

DS1744-70IND+

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

22 -
RFQ
DS1744-70IND+

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V -40°C ~ 85°C Through Hole - - 28-EDIP
MCP7940M-I/MS

MCP7940M-I/MS

IC RTC CLK/CALENDAR I2C 8MSOP

Microchip Technology

879 -
RFQ
MCP7940M-I/MS

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM 64B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 1µA @ 5.5V -40°C ~ 85°C Surface Mount - - 8-MSOP
MCP7940M-I/P

MCP7940M-I/P

IC RTC CLOCK/CALENDAR I2C 8DIP

Microchip Technology

303 -
RFQ
MCP7940M-I/P

Datasheet

- 8-DIP (0.300", 7.62mm) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM 64B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 1µA @ 5.5V -40°C ~ 85°C Through Hole - - 8-PDIP
MCP7940N-E/MS

MCP7940N-E/MS

IC RTC CLK/CALENDAR I2C 8MSOP

Microchip Technology

603 -
RFQ
MCP7940N-E/MS

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM 64B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 5.5V 1.2µA @ 3.3V -40°C ~ 125°C Surface Mount Automotive AEC-Q100 8-MSOP
RX8111CE B0

RX8111CE B0

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

1,055 -
RFQ
RX8111CE B0

Datasheet

RX8111CE 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V - 3µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SMD
DS17887-3+

DS17887-3+

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

15 -
RFQ
DS17887-3+

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 8KB HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 2.7V ~ 3.7V 0°C ~ 70°C Through Hole - - 24-EDIP
DS1554WP-120+

DS1554WP-120+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

15 -
RFQ
DS1554WP-120+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 4mA @ 3.3V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS17887-3IND+

DS17887-3IND+

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

20 -
RFQ
DS17887-3IND+

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 8KB HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 2.7V ~ 3.7V -40°C ~ 85°C Through Hole - - 24-EDIP
DS1746P-70+

DS1746P-70+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

36 -
RFQ
DS1746P-70+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 4mA @ 5V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1556-70IND+

DS1556-70IND+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

17 -
RFQ
DS1556-70IND+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 6mA @ 5V -40°C ~ 85°C Through Hole - - 32-EDIP
MCP79400-I/ST

MCP79400-I/ST

IC RTC CLK/CALENDAR I2C 8TSSOP

Microchip Technology

400 -
RFQ
MCP79400-I/ST

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Unique ID 64B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 5.5V 1.2µA (Typ) @ 3.3V -40°C ~ 85°C Surface Mount - - 8-TSSOP
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