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
ISL12028IB27Z-T

ISL12028IB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

97 -
RFQ
ISL12028IB27Z-T

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
DS1685E-5

DS1685E-5

IC RTC CLK/CALENDAR PAR 24TSSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1685E-5

Datasheet

- 24-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 5V 0°C ~ 70°C Surface Mount - - 24-TSSOP
X1228S14I-4.5A

X1228S14I-4.5A

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

97 -
RFQ
X1228S14I-4.5A

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOIC
DS17285-5

DS17285-5

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17285-5

Datasheet

- 24-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 2KB HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 4.5V ~ 5.5V 0°C ~ 70°C Through Hole - - 24-PDIP
DS17285E-3+

DS17285E-3+

IC RTC CLK/CALENDAR PAR 28-TSOP

Analog Devices Inc./Maxim Integrated

55 -
RFQ
DS17285E-3+

Datasheet

* - Tray Obsolete Not Verified - - - - - - - - - - - - - -
CDP6818DX

CDP6818DX

IC RTC CLK/CALENDAR 24CERDIP

Harris Corporation

51 -
RFQ
CDP6818DX

Datasheet

- 24-CDIP (0.300", 7.62mm) Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output 50B HH:MM:SS (12/24 hr) YY-MM-DD-dd - 3V ~ 6V - 50µA ~ 3mA @ 3V ~ 5V 0°C ~ 70°C (TA) Through Hole - - 24-CERDIP
DS1315-33

DS1315-33

IC RTC PHANTOM CHIP PAR 16DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1315-33

Datasheet

- 16-DIP (0.300", 7.62mm) Tube Obsolete Not Verified Phantom Time Chip Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 3V ~ 3.6V 2.5V ~ 3.7V 1.1mA @ 3.3V 0°C ~ 70°C Through Hole - - 16-PDIP
DS12885TN+

DS12885TN+

IC RTC CLK/CALENDAR PAR 32TQFP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS12885TN+

Datasheet

- 32-TQFP Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 114B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 4V 15mA @ 4.5V ~ 5.5V -40°C ~ 85°C Surface Mount - - 32-TQFP (7x7)
V3022SO28A+

V3022SO28A+

IC RTC CLOCK/CALENDAR 28SOIC

EM Microelectronic

11 -
RFQ
V3022SO28A+

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Last Time Buy Not Verified Clock/Calendar Alarm, Leap Year, RAM 8B HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd - 2V ~ 5.5V - 15µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 28-SOIC
DS17885-3+

DS17885-3+

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17885-3+

Datasheet

- 24-DIP (0.600", 15.24mm) Tube Obsolete 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-PDIP
CDP6818D

CDP6818D

IC RTC CLK/CALENDAR 24CERDIP

Harris Corporation

61 -
RFQ
CDP6818D

Datasheet

- 24-CDIP (0.300", 7.62mm) Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output 50B HH:MM:SS (12/24 hr) YY-MM-DD-dd - 3V ~ 6V - 50µA ~ 3mA @ 3V ~ 5V 0°C ~ 70°C (TA) Through Hole - - 24-CERDIP
BQ4802YDW

BQ4802YDW

IC RTC CLK/CALENDAR PAR 28SOIC

Benchmarq

29 -
RFQ
BQ4802YDW

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Bulk Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.4V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V 0°C ~ 70°C Surface Mount - - 28-SOIC
DS1553W-150

DS1553W-150

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1553W-150

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 3V 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1554W-120+

DS1554W-120+

IC RTC CLK/CALENDAR PAR 32-EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1554W-120+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Bulk 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 0°C ~ 70°C Through Hole - - 32-EDIP
DS1244WP-120IND+

DS1244WP-120IND+

IC RTC PHANTOM CHIP PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1244WP-120IND+

Datasheet

- 34-PowerCap™ Module Bulk Obsolete 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 3V 7mA @ 3.3V -40°C ~ 85°C Surface Mount - - 34-PowerCap Module
DS1556W-120

DS1556W-120

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1556W-120

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete 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 0°C ~ 70°C Through Hole - - 32-EDIP
DP8570AV

DP8570AV

IC RTC TIMER PERIPH PAR 28PLCC

National Semiconductor

88 -
RFQ
DP8570AV

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)
DS1251W-120+

DS1251W-120+

IC RTC PHANTOM PAR 32-DIP

Analog Devices Inc./Maxim Integrated

35 -
RFQ
DS1251W-120+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Bulk Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB 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
DS1315SN-33+

DS1315SN-33+

IC RTC PHANTOM CHIP PAR 16SOIC

Analog Devices Inc./Maxim Integrated

23 -
RFQ
DS1315SN-33+

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Phantom Time Chip Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 3V ~ 3.6V 2.5V ~ 3.7V 1.1mA @ 3.3V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1315EN-33+

DS1315EN-33+

IC RTC PHANTOM CHIP PAR 20TSSOP

Analog Devices Inc./Maxim Integrated

14 -
RFQ
DS1315EN-33+

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Phantom Time Chip Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 3V ~ 3.6V 2.5V ~ 3.7V 1.1mA @ 3.3V -40°C ~ 85°C Surface Mount - - 20-TSSOP
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