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
ISL12027IB30AZ-T

ISL12027IB30AZ-T

IC RTC CLK/CALENDAR I2C 8SOIC

Intersil

3,000 -
RFQ
ISL12027IB30AZ-T

Datasheet

- 8-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 - - 8-SOIC
ISL12027IB27AZ

ISL12027IB27AZ

IC RTC CLK/CALENDAR I2C 8SOIC

Intersil

2,965 -
RFQ
ISL12027IB27AZ

Datasheet

- 8-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 ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-SOIC
ISL12029IB27Z-T

ISL12029IB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

2,290 -
RFQ
ISL12029IB27Z-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
ISL12028IB27Z

ISL12028IB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

1,956 -
RFQ
ISL12028IB27Z

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 ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
ISL12027IB30AZ

ISL12027IB30AZ

IC RTC CLK/CALENDAR I2C 8SOIC

Intersil

1,585 -
RFQ
ISL12027IB30AZ

Datasheet

- 8-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 ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-SOIC
ISL12028IV27Z-T

ISL12028IV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Intersil

1,427 -
RFQ
ISL12028IV27Z-T

Datasheet

- 14-TSSOP (0.173", 4.40mm 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-TSSOP
ISL12027IVZ-T

ISL12027IVZ-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Intersil

1,265 -
RFQ
ISL12027IVZ-T

Datasheet

- 8-TSSOP (0.173", 4.40mm 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 - - 8-TSSOP
ISL12029IB27Z

ISL12029IB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Elantec

1,000 -
RFQ
ISL12029IB27Z

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 ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
ISL12029AIB27Z

ISL12029AIB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Elantec

1,000 -
RFQ
ISL12029AIB27Z

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Supervisor, Watchdog Timer 512B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C (TA) Surface Mount - - 14-SOIC
ISL12027IV27AZ-T

ISL12027IV27AZ-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Intersil

892 -
RFQ
ISL12027IV27AZ-T

Datasheet

- 8-TSSOP (0.173", 4.40mm 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 - - 8-TSSOP
DS1339C-2

DS1339C-2

DS1339 I2C SERIAL RTC

Analog Devices Inc./Maxim Integrated

1,479 -
RFQ
DS1339C-2

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD I2C 1.8V ~ 5.5V 1.3V ~ 3.7V 100µA @ 2.2V -40°C ~ 85°C (TA) Surface Mount - - 16-SOIC
BQ4845S-A4NTR

BQ4845S-A4NTR

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

0 -
RFQ
BQ4845S-A4NTR

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.75V ~ 5.5V 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V -40°C ~ 85°C Surface Mount - - 28-SOIC
BQ4845YS-A4NTR

BQ4845YS-A4NTR

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

0 -
RFQ
BQ4845YS-A4NTR

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete 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 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V -40°C ~ 85°C Surface Mount - - 28-SOIC
DS1685E-3/TR

DS1685E-3/TR

DS1685 5V REAL-TIME CLOCK

Analog Devices Inc./Maxim Integrated

1,246 -
RFQ
DS1685E-3/TR

Datasheet

- 24-TSSOP (0.173", 4.40mm Width) Bulk Active Not Verified Clock/Calendar Alarm, Daylight Savings, NVRAM, 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 0°C ~ 70°C (TA) Surface Mount - - 24-TSSOP
SLR32CN-32.768K

SLR32CN-32.768K

IC RTC CLK/CALENDAR I2C 10SMD

Suntsu Electronics, Inc

314 -
RFQ
SLR32CN-32.768K

Datasheet

- 10-SMD, No Lead Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, RAM - HH:MM:SS YY-MM-DD I2C 2.5V ~ 5V 1.6V ~ 5V 500nA @ 3V -40°C ~ 85°C Surface Mount - - 10-SMD
DS1302SN-16/TR

DS1302SN-16/TR

TRICKLE-CHARGE TIMEKEEPING CHIP

Analog Devices Inc./Maxim Integrated

2,750 -
RFQ
DS1302SN-16/TR

Datasheet

- 8-SOIC (0.209", 5.30mm Width) Bulk Active Not Verified Clock/Calendar Leap Year, NVSRAM, RAM, Trickle-Charger 31B HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2V ~ 5.5V 2V ~ 5.5V 0.3µA ~ 1µA @ 2V ~ 5V -40°C ~ 85°C (TA) Surface Mount - - 8-SOIC
BQ4845S-A4

BQ4845S-A4

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

0 -
RFQ
BQ4845S-A4

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.75V ~ 5.5V 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V 0°C ~ 70°C Surface Mount - - 28-SOIC
BQ4845YS-A4

BQ4845YS-A4

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

0 -
RFQ
BQ4845YS-A4

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Obsolete 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 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V 0°C ~ 70°C Surface Mount - - 28-SOIC
DS1685Q-3

DS1685Q-3

IC RTC CLK/CALENDAR PAR 28PLCC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1685Q-3

Datasheet

- 28-LCC (J-Lead) Tube Obsolete 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 0°C ~ 70°C Surface Mount - - 28-PLCC (11.51x11.51)
ISL1209IU10Z-TK

ISL1209IU10Z-TK

IC RTC EVENT REC I2C 10MSOP

Renesas Electronics Corporation

998 -
RFQ
ISL1209IU10Z-TK

Datasheet

- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Time Event Recorder Alarm, Leap Year, SRAM 2B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 4µA ~ 6µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 10-MSOP
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