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
RTC-4543SA:A:PURE SN

RTC-4543SA:A:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4543SA:A:PURE SN

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Strip Obsolete Not Verified Clock/Calendar - - - - 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4543SA:A3:PURE SN

RTC-4543SA:A3:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4543SA:A3:PURE SN

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar - - - - 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4543SA:B0:PURE SN

RTC-4543SA:B0:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4543SA:B0:PURE SN

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar - - - - 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4574SA:B0:PURE SN

RTC-4574SA:B0:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4574SA:B0:PURE SN

Datasheet

RTC-4574SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-8581SA:B0:PURE SN

RX-8581SA:B0:PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8581SA:B0:PURE SN

Datasheet

RX-8581SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-8581SA:B:PURE SN

RX-8581SA:B:PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8581SA:B:PURE SN

Datasheet

RX-8581SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
MAX31341BEWC+

MAX31341BEWC+

IC RTC CLK/CALENDAR I2C 12WLP

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

- 12-WFBGA, WLBGA Strip Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output 64B HH:MM:SS (24 hr) YY-MM-DD-dd I2C 1.6V ~ 3.6V 1.6V ~ 3.6V 0.33µA ~ 0.39µA @ 1.6V ~ 3.6V -40°C ~ 85°C Surface Mount - - 12-WLP (2.14x1.56)
DS1306EN+T&R/C04

DS1306EN+T&R/C04

IC INTEGRATED CIRCUIT

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1306EN+T&R/C04

Datasheet

* - Tape & Reel (TR) Obsolete Not Verified - - - - - - - - - - - - - -
1337ACSRI

1337ACSRI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 16-SOIC (0.295", 7.50mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 1.8V ~ 5.5V 1.3V ~ 3.7V 0.6µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
1337CSRI

1337CSRI

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 16-SOIC (0.295", 7.50mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 1.8V ~ 5.5V 1.3V ~ 3.7V 0.6µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
1337CSRI8

1337CSRI8

IC RTC CLK/CALENDAR I2C 16SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 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 1.8V ~ 5.5V 1.3V ~ 3.7V 0.6µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
1338A-31DVGI

1338A-31DVGI

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ

-

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Bulk Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56b HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 2.7V ~ 5.5V 1.3V ~ 3.7V 5µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
1338A-31DVGI8

1338A-31DVGI8

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ

-

- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 2.7V ~ 5.5V 1.3V ~ 3.7V 5µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
1339A-31DVGI

1339A-31DVGI

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ

-

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
1339A-31DVGI8

1339A-31DVGI8

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ

-

- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
1339B-31DVGI

1339B-31DVGI

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ

-

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
1339B-31DVGI8

1339B-31DVGI8

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

0 -
RFQ

-

- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
ISL12028IBZ-T

ISL12028IBZ-T

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

0 -
RFQ
ISL12028IBZ-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
V3023SO28A+

V3023SO28A+

IC RTC CLOCK/CALENDAR 28SOIC

EM Microelectronic

0 -
RFQ

-

- 28-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, RAM 8B HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd - 2V ~ 5.5V - 15µA @ 5V -40°C ~ 85°C (TA) Surface Mount - - 28-SOIC
RA-4565SA B3 PURE SN

RA-4565SA B3 PURE SN

IC RTC CLK/CALENDAR SPI 14SOP

EPSON

0 -
RFQ
RA-4565SA B3 PURE SN

Datasheet

- 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS YY-MM-DD-dd SPI, 4-Wire Serial 1.6V ~ 5.5V - 1.6µA ~ 2µA @ 3V ~ 5V -40°C ~ 125°C Surface Mount Automotive AEC-Q200 14-SOP
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