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
DS1744-70+

DS1744-70+

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

423 -
RFQ
DS1744-70+

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 0°C ~ 70°C Through Hole - - 28-EDIP
DS1244W-120+

DS1244W-120+

IC RTC PHANTOM CHIP PAR 28EDIP

Analog Devices Inc./Maxim Integrated

57 -
RFQ
DS1244W-120+

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Active Not Verified Phantom Time Chip Leap Year, NVSRAM 32KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 7mA @ 3.3V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1746WP-120+

DS1746WP-120+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

47 -
RFQ
DS1746WP-120+

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 2.97V ~ 3.63V 3V 2mA @ 3.3V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1244Y-70+

DS1244Y-70+

IC RTC PHANTOM CHIP PAR 28EDIP

Analog Devices Inc./Maxim Integrated

140 -
RFQ
DS1244Y-70+

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Active Not Verified Phantom Time Chip Leap Year, NVSRAM 32KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 10mA @ 5V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1746W-120+

DS1746W-120+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

256 -
RFQ
DS1746W-120+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1248Y-70+

DS1248Y-70+

IC RTC PHANTOM CHIP PAR 32EDIP

Analog Devices Inc./Maxim Integrated

287 -
RFQ
DS1248Y-70+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Phantom Time Chip NVSRAM 128KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 10mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1746-70IND+

DS1746-70IND+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

30 -
RFQ
DS1746-70IND+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1251Y-70+

DS1251Y-70+

IC RTC PHANTOM CHIP PAR 32EDIP

Analog Devices Inc./Maxim Integrated

168 -
RFQ
DS1251Y-70+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 10mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1746-70+

DS1746-70+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

415 -
RFQ
DS1746-70+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1556W-120IND+

DS1556W-120IND+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

114 -
RFQ
DS1556W-120IND+

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 2.97V ~ 3.63V - 4mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1556-70+

DS1556-70+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

32 -
RFQ
DS1556-70+

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 0°C ~ 70°C Through Hole - - 32-EDIP
DS1747-70+

DS1747-70+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

612 -
RFQ
DS1747-70+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1747W-120IND+

DS1747W-120IND+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

89 -
RFQ
DS1747W-120IND+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
MCP7940MT-I/SN

MCP7940MT-I/SN

IC RTC CLK/CALENDAR I2C 8SOIC

Microchip Technology

6,121 -
RFQ
MCP7940MT-I/SN

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) 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-SOIC
MCP7940M-I/SN

MCP7940M-I/SN

IC RTC CLK/CALENDAR I2C 8SOIC

Microchip Technology

1,315 -
RFQ
MCP7940M-I/SN

Datasheet

- 8-SOIC (0.154", 3.90mm 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-SOIC
MCP7940MT-I/MS

MCP7940MT-I/MS

IC RTC CLK/CALENDAR I2C 8MSOP

Microchip Technology

8,760 -
RFQ
MCP7940MT-I/MS

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) 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
PCF85063AT/AAZ

PCF85063AT/AAZ

IC RTC CLOCK/CALENDAR I2C 8SO

NXP USA Inc.

1,826 -
RFQ
PCF85063AT/AAZ

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 0.9V ~ 5.5V - 0.6µA @ 3.3V -40°C ~ 85°C Surface Mount - - 8-SO
MCP7940NT-I/ST

MCP7940NT-I/ST

IC RTC CLK/CALENDAR I2C 8TSSOP

Microchip Technology

4,748 -
RFQ
MCP7940NT-I/ST

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) 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 1.5V ~ 5.5V 1.2µA @ 3.3V -40°C ~ 85°C Surface Mount Automotive AEC-Q100 8-TSSOP
MCP7940N-I/ST

MCP7940N-I/ST

IC RTC CLK/CALENDAR I2C 8TSSOP

Microchip Technology

2,003 -
RFQ
MCP7940N-I/ST

Datasheet

- 8-TSSOP (0.173", 4.40mm 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 ~ 85°C Surface Mount Automotive AEC-Q100 8-TSSOP
MCP7940N-E/SN

MCP7940N-E/SN

IC RTC CLK/CALENDAR I2C 8SOIC

Microchip Technology

7,499 -
RFQ
MCP7940N-E/SN

Datasheet

- 8-SOIC (0.154", 3.90mm 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-SOIC
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