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
RX-8581NB:B0

RX-8581NB:B0

IC RTC CLK/CALENDAR I2C 22SON

EPSON

0 -
RFQ
RX-8581NB:B0

Datasheet

RX-8581NB 22-SMD, 20 Leads, Flat Leads 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 - - 22-SON
RTC-72423A0:PURE SN

RTC-72423A0:PURE SN

IC RTC CLK/CALENDAR PAR 24SOP

EPSON

0 -
RFQ
RTC-72423A0:PURE SN

Datasheet

RTC-72423 24-SOIC (0.311", 7.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 5µA ~ 10µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 24-SOP
RTC-72423A3:PURE SN

RTC-72423A3:PURE SN

IC RTC CLK/CALENDAR PAR 24SOP

EPSON

0 -
RFQ
RTC-72423A3:PURE SN

Datasheet

RTC-72423 24-SOIC (0.311", 7.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 5µA ~ 10µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 24-SOP
RX-8025SA:AA0:PURE SN

RX-8025SA:AA0:PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8025SA:AA0:PURE SN

Datasheet

RX-8025SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V - 1.2µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-8025SA:AA3:PURE SN

RX-8025SA:AA3:PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8025SA:AA3:PURE SN

Datasheet

RX-8025SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V - 1.2µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
1338AC-31SRGI

1338AC-31SRGI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1338AC-31SRGI

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3.3V ~ 5.5V 1.3V ~ 3.7V 5µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
1338AC-31SRGI8

1338AC-31SRGI8

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1338AC-31SRGI8

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3.3V ~ 5.5V 1.3V ~ 3.7V 5µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
PT7C4337AWE

PT7C4337AWE

IC RTC CLK/CALENDAR I2C 8SOIC

Diodes Incorporated

0 -
RFQ
PT7C4337AWE

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.8µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 8-SOIC
1337AGCSRGI

1337AGCSRGI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1337AGCSRGI

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.3µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
1337AGCSRGI8

1337AGCSRGI8

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1337AGCSRGI8

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.3µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
1338AC-18SRGI

1338AC-18SRGI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1338AC-18SRGI

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 3.7V 2µA @ 3.3V -40°C ~ 85°C Surface Mount - - 16-SOIC
1338AC-18SRGI8

1338AC-18SRGI8

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1338AC-18SRGI8

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 3.7V 2µA @ 3.3V -40°C ~ 85°C Surface Mount - - 16-SOIC
1339AC-2SRGI

1339AC-2SRGI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1339AC-2SRGI

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
1339AC-2SRGI8

1339AC-2SRGI8

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1339AC-2SRGI8

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
1339AC-31SRGI

1339AC-31SRGI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1339AC-31SRGI

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
1339AC-31SRGI8

1339AC-31SRGI8

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ
1339AC-31SRGI8

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
PCA8565AU/5BB/1,01

PCA8565AU/5BB/1,01

IC RTC CLOCK/CALENDAR I2C DIE

NXP USA Inc.

0 -
RFQ
PCA8565AU/5BB/1,01

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 1.8V ~ 5.5V - 0.9µA ~ 1.8µA @ 2V ~ 5V -40°C ~ 125°C Surface Mount Automotive AEC-Q100 Die
RX-4575LC:B3:PURE SN

RX-4575LC:B3:PURE SN

IC RTC CLK/CALENDAR SER 12VSOJ

EPSON

0 -
RFQ
RX-4575LC:B3:PURE SN

Datasheet

- 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd 3-Wire Serial 1.6V ~ 5.5V - 0.7µA ~ 0.9µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
PT7C43190LEX

PT7C43190LEX

IC RTC CLK/CALENDAR SER 8TSSOP

Diodes Incorporated

0 -
RFQ
PT7C43190LEX

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 1.35V ~ 5.5V - 0.6µA ~ 14µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
PT7C43190WEX

PT7C43190WEX

IC RTC CLK/CALENDAR SER 8SOIC

Diodes Incorporated

0 -
RFQ
PT7C43190WEX

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 1.35V ~ 5.5V - 0.6µA ~ 14µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
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