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
PCF2123BS/1,512

PCF2123BS/1,512

IC RTC CLK/CALENDAR SPI 16HVQFN

NXP USA Inc.

0 -
RFQ
PCF2123BS/1,512

Datasheet

- 16-VFQFN Exposed Pad Tube Discontinued at Digi-Key Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 1.6V ~ 5.5V - 0.33µA ~ 0.38µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 16-HVQFN (3x3)
PCF2129AT/1,518

PCF2129AT/1,518

IC RTC CLOCK/CALENDAR I2C 20SO

NXP USA Inc.

0 -
RFQ
PCF2129AT/1,518

Datasheet

- 20-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 4.2V 1.8V ~ 4.2V 1.5µA @ 3.3V -40°C ~ 85°C Surface Mount - - 20-SO
PCF2127AT/1,518

PCF2127AT/1,518

IC RTC CLOCK/CALENDAR I2C 20SO

NXP USA Inc.

0 -
RFQ
PCF2127AT/1,518

Datasheet

- 20-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer 512B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 4.2V 1.8V ~ 4.2V 1.5µA @ 3.3V -40°C ~ 85°C Surface Mount - - 20-SO
PCF8564ACX9/1,005

PCF8564ACX9/1,005

IC RTC CLOCK/CALENDAR I2C DIE

NXP USA Inc.

0 -
RFQ
PCF8564ACX9/1,005

Datasheet

- Die Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Watchdog Timer - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1V ~ 5.5V - 0.6µA ~ 0.75µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - Die
RX-4801JE:UB

RX-4801JE:UB

IC RTC CLK/CALENDAR SPI 20VSOJ

EPSON

0 -
RFQ
RX-4801JE:UB

Datasheet

- 20-LSSOJ (0.213", 5.40mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year 16B HH:MM:SS (24 hr) YY-MM-DD-dd SPI 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
PCF8523TS/1,112

PCF8523TS/1,112

IC RTC CLK/CALENDAR I2C 14TSSOP

NXP USA Inc.

0 -
RFQ
PCF8523TS/1,112

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.6V ~ 5.5V 1.8V ~ 5.5V 0.5µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-TSSOP
ISL12027AIB27Z-T

ISL12027AIB27Z-T

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12027AIB27Z-T

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) 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
ISL12027AIV27Z-T

ISL12027AIV27Z-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12027AIV27Z-T

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) 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
ISL12028AIB27Z-T

ISL12028AIB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12028AIB27Z-T

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) 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
ISL12028AIV27Z-T

ISL12028AIV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12028AIV27Z-T

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) 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
ISL12029AIB27Z-T

ISL12029AIB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12029AIB27Z-T

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) 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
ISL12029AIV27Z-T

ISL12029AIV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12029AIV27Z-T

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) 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
ISL12027AIB27Z

ISL12027AIB27Z

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12027AIB27Z

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
ISL12027AIV27Z

ISL12027AIV27Z

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12027AIV27Z

Datasheet

- 8-TSSOP (0.173", 4.40mm 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-TSSOP
ISL12028AIB27Z

ISL12028AIB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12028AIB27Z

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
ISL12028AIV27Z

ISL12028AIV27Z

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12028AIV27Z

Datasheet

- 14-TSSOP (0.173", 4.40mm 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-TSSOP
ISL12029AIB27Z

ISL12029AIB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12029AIB27Z

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
ISL12029AIV27Z

ISL12029AIV27Z

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12029AIV27Z

Datasheet

- 14-TSSOP (0.173", 4.40mm 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-TSSOP
RTC-7301DG:B ROHS

RTC-7301DG:B ROHS

IC RTC CLK/CALENDAR PAR 18DIP

EPSON

0 -
RFQ
RTC-7301DG:B ROHS

Datasheet

- 18-DIP (0.300", 7.62mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.4V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Through Hole - - 18-DIP
RX-8581JE:B3 I2C-BUS

RX-8581JE:B3 I2C-BUS

IC RTC CLK/CALENDAR I2C 20VSOJ

EPSON

0 -
RFQ
RX-8581JE:B3 I2C-BUS

Datasheet

RX-8581JE 20-LSSOJ (0.213", 5.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
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