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
PT7C4302ZEE

PT7C4302ZEE

IC RTC CLK/CALENDAR SER 8TDFN

Diodes Incorporated

0 -
RFQ
PT7C4302ZEE

Datasheet

- 8-WFDFN Exposed Pad Bulk Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output, Trickle-Charger 31B HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 1.2V ~ 5.5V 1.5V ~ 5.5V 25.3µA ~ 81µA @ 2V ~ 5V -40°C ~ 85°C (TA) Surface Mount - - 8-TDFN (2x3)
PT7C4372AZEE

PT7C4372AZEE

IC RTC CLK/CALENDAR I2C 8TDFN

Diodes Incorporated

0 -
RFQ

-

- 8-WFDFN Exposed Pad Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 6V - 0.8µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 8-TDFN (2x3)
PT7C4563ZEE

PT7C4563ZEE

IC RTC CLK/CALENDAR I2C 8TDFN

Diodes Incorporated

0 -
RFQ
PT7C4563ZEE

Datasheet

- 8-WFDFN Exposed Pad Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.3V ~ 5.5V - 0.65µA ~ 0.85µA @ 3V ~ 5V -40°C ~ 85°C (TA) Surface Mount - - 8-TDFN (2x3)
RA-4574SA:B PURE SN

RA-4574SA:B PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RA-4574SA:B PURE SN

Datasheet

RA-4574SA 14-SOIC (0.197", 5.00mm Width) Tube 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
RA-4574SA:B0 PURE SN

RA-4574SA:B0 PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RA-4574SA:B0 PURE SN

Datasheet

RA-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
RA-8565SA:B PURE SN

RA-8565SA:B PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RA-8565SA:B PURE SN

Datasheet

RA-8565SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD-dd I2C 1.8V ~ 5.5V - 1µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 125°C Surface Mount - - 14-SOP
RA-8565SA:B0 PURE SN

RA-8565SA:B0 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RA-8565SA:B0 PURE SN

Datasheet

RA-8565SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD-dd I2C 1.8V ~ 5.5V - 1µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 125°C Surface Mount - - 14-SOP
RA-8565SA:B3 PURE SN

RA-8565SA:B3 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RA-8565SA:B3 PURE SN

Datasheet

RA-8565SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD-dd I2C 1.8V ~ 5.5V - 1µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 125°C Surface Mount - - 14-SOP
RTC-4543SA:A ROHS

RTC-4543SA:A ROHS

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4543SA:A ROHS

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Bulk Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4543SA:B:PURE SN

RTC-4543SA:B:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

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

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4543SA:B ROHS

RTC-4543SA:B ROHS

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4543SA:B ROHS

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4543SA:B3:PURE SN

RTC-4543SA:B3:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4543SA:B3:PURE SN

Datasheet

RTC-4543SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd 3-Wire Serial 2.5V ~ 5.5V - 1µA ~ 3µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-4574JE:B ROHS

RTC-4574JE:B ROHS

IC RTC CLK/CALENDAR SER 20VSOJ

EPSON

0 -
RFQ
RTC-4574JE:B ROHS

Datasheet

RTC-4574JE 20-LSSOJ (0.213", 5.40mm Width) Strip Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
RTC-4574NB:B ROHS

RTC-4574NB:B ROHS

IC RTC CLK/CALENDAR SER 22SON

EPSON

0 -
RFQ
RTC-4574NB:B ROHS

Datasheet

- 22-LFDFN Strip Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 22-SON (6.3x4.8)
RTC-4574SA:B:PURE SN

RTC-4574SA:B:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

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

Datasheet

RTC-4574SA 14-SOIC (0.197", 5.00mm Width) Tube 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
RTC-4574SA:B3:PURE SN

RTC-4574SA:B3:PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RTC-4574SA:B3: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
RTC-4701JE:B ROHS

RTC-4701JE:B ROHS

IC RTC CLK/CALENDAR SER 20VSOJ

EPSON

0 -
RFQ
RTC-4701JE:B ROHS

Datasheet

- 20-LSSOJ (0.213", 5.40mm Width) Strip Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - - -40°C ~ 85°C Surface Mount - - 20-VSOJ
RTC-4701NB:B ROHS

RTC-4701NB:B ROHS

IC RTC CLK/CALENDAR SER 22SON

EPSON

0 -
RFQ
RTC-4701NB:B ROHS

Datasheet

- 22-LFDFN Strip Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - - -40°C ~ 85°C Surface Mount - - 22-SON (6.3x4.8)
RTC-72421A: PURE SN

RTC-72421A: PURE SN

IC RTC CLK/CALENDAR PAR 18DIP

EPSON

0 -
RFQ
RTC-72421A: PURE SN

Datasheet

RTC-72421 18-DIP (0.300", 7.62mm) Bulk Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (12/24 hr) - Parallel 4.5V ~ 5.5V - 5µA ~ 10µA @ 2V ~ 5V -10°C ~ 70°C Through Hole - - 18-DIP
RTC-72421B: PURE SN

RTC-72421B: PURE SN

IC RTC CLK/CALENDAR PAR 18DIP

EPSON

0 -
RFQ
RTC-72421B: PURE SN

Datasheet

RTC-72421 18-DIP (0.300", 7.62mm) Bulk Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (12/24 hr) - Parallel 4.5V ~ 5.5V - 5µA ~ 10µA @ 2V ~ 5V -10°C ~ 70°C Through Hole - - 18-DIP
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