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
DP8573AVX

DP8573AVX

IC RTC CLK/CALENDAR PAR 28PLCC

National Semiconductor

640 -
RFQ
DP8573AVX 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)
DS1643P-70

DS1643P-70

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1643P-70 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM 8KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 3mA @ 5V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1244Y-150

DS1244Y-150

256K NV SRAM & PHANTOM CLOCK

Analog Devices Inc./Maxim Integrated

2,514 -
RFQ
DS1244Y-150 Datasheet - 28-DIP Module (0.600", 15.24mm) Bulk Active Not Verified Phantom Time Chip EEPROM, Leap Year, RAM, SRAM 32KB HH:MM:SS (12/24 hr) YY-MM-DD Parallel 4.5V ~ 5.5V - 5mA ~ 10mA @ 3V ~ 5V 0°C ~ 70°C (TA) Through Hole - - 28-EDIP
DS1553WP-150

DS1553WP-150

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1553WP-150 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 8KB 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
DP8573AV

DP8573AV

IC RTC CLK/CALENDAR PAR 28PLCC

Texas Instruments

0 -
RFQ
DP8573AV Datasheet - 28-LCC (J-Lead) Tube Obsolete 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)
DP8573AV

DP8573AV

IC RTC CLK/CALENDAR PAR 28PLCC

National Semiconductor

1,302 -
RFQ
DP8573AV 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)
DS1742-85+

DS1742-85+

IC RTC CLK/CALENDAR PAR 24-EDIP

Analog Devices Inc./Maxim Integrated

231 -
RFQ
DS1742-85+ Datasheet * - Tube Obsolete Not Verified - - - - - - - - - - - - - -
DS1553W-120

DS1553W-120

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1553W-120 Datasheet - 28-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 8KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1386P-8-120

DS1386P-8-120

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1386P-8-120 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer 8KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 4mA @ 5V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1386P-8-120

DS1386P-8-120

IC RTC CLK/CALENDAR PAR 34PCM

Dallas Semiconductor

697 -
RFQ
DS1386P-8-120 Datasheet - 34-PowerCap™ Module Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer 8KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 4mA @ 5V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1248Y-200

DS1248Y-200

1024K NV SRAM & PHANTOM CLOCK

Analog Devices Inc./Maxim Integrated

1,375 -
RFQ
DS1248Y-200 Datasheet - 32-DIP Module (0.600", 15.24mm) Bulk Active Not Verified Phantom Time Chip EEPROM, Leap Year, NVSRAM, RAM 128KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V, 4.5V ~ 5.5V Integrated 10mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1554W-120IND

DS1554W-120IND

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1554W-120IND Datasheet - 32-DIP Module (0.600", 15.24mm) Tube Obsolete 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 - 4mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1248Y-120

DS1248Y-120

1024K NV SRAM & PHANTOM CLOCK

Analog Devices Inc./Maxim Integrated

6,093 -
RFQ
DS1248Y-120 Datasheet - 32-DIP Module (0.600", 15.24mm) Bulk Active Not Verified Phantom Time Chip Leap Year, NVSRAM 128KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V, 4.5V ~ 5.5V Integrated 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

0 -
RFQ
DS1746-70 Datasheet - 32-DIP Module (0.600", 15.24mm) Tube Obsolete 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
DP8570AVX

DP8570AVX

IC RTC TIMER PERIPH PAR 28PLCC

National Semiconductor

3,000 -
RFQ
DP8570AVX Datasheet - 28-LCC (J-Lead) Bulk Active Not Verified Timer Clock Peripheral (TCP) Alarm, Leap Year 44B 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)
DP8570AVX

DP8570AVX

IC RTC TIMER PERIPH PAR 28PLCC

Texas Instruments

0 -
RFQ
DP8570AVX Datasheet - 28-LCC (J-Lead) Tape & Reel (TR) Obsolete Not Verified Timer Clock Peripheral (TCP) Alarm, Leap Year 44B 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)
DS1251YP-100

DS1251YP-100

4096K NV SRAM & PHANTOM CLOCK

Analog Devices Inc./Maxim Integrated

129 -
RFQ
DS1251YP-100 Datasheet - 34-PowerCap™ Module Bulk Active Not Verified Phantom Time Chip EEPROM, Leap Year, NVSRAM, RAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD Parallel 2.97V ~ 3.63V, 4.5V ~ 5.5V Integrated 10mA @ 5V 0°C ~ 70°C (TA) Surface Mount - - 34-PowerCap Module
DP8570AV

DP8570AV

IC RTC TIMER PERIPH PAR 28PLCC

Texas Instruments

0 -
RFQ
DP8570AV Datasheet - 28-LCC (J-Lead) Tube Obsolete Not Verified Timer Clock Peripheral (TCP) Alarm, Leap Year 44B 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)
DS1251Y-150

DS1251Y-150

4096K NV SRAM & PHANTOM CLOCK

Analog Devices Inc./Maxim Integrated

213 -
RFQ
DS1251Y-150 Datasheet - 32-DIP Module (0.600", 15.24mm) Bulk Active Not Verified Phantom Time Chip EEPROM, Leap Year, NVSRAM, RAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD Parallel 2.97V ~ 3.63V, 4.5V ~ 5.5V Integrated 10mA @ 5V 0°C ~ 70°C (TA) Through Hole - - 32-EDIP
DS1248W-120+

DS1248W-120+

IC RTC PHANTOM PAR 32-DIP

Analog Devices Inc./Maxim Integrated

770 -
RFQ
DS1248W-120+ Datasheet - 32-DIP Module (0.600", 15.24mm) Bulk Obsolete Not Verified Phantom Time Chip NVSRAM 128KB 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 - - 32-EDIP
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