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
DS12885N

DS12885N

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS12885N

Datasheet

- 24-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 114B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 4V 15mA @ 4.5V ~ 5.5V -40°C ~ 85°C Through Hole - - 24-PDIP
DS1670E/T&R

DS1670E/T&R

IC RTC SYST CTRLR SER 20TSSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1670E/T&R

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Obsolete Not Verified Portable System Controller Alarm, Leap Year, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2.97V ~ 3.63V 2.5V ~ 3.7V 100µA @ 3.3V 0°C ~ 70°C Surface Mount - - 20-TSSOP
M41ST84WMQ6F

M41ST84WMQ6F

IC RTC CLOCK/CALENDAR I2C 16SO

STMicroelectronics

0 -
RFQ
M41ST84WMQ6F

Datasheet

- 16-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer 44B HH:MM:SS:hh (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 3.6V 2.5V ~ 3.5V 0.5mA @ 2.7V ~ 3.6V -40°C ~ 85°C Surface Mount - - 16-SO
RX-4035SA:B PURE SN

RX-4035SA:B PURE SN

IC RTC TIME EVENT REC SPI 14SOP

EPSON

0 -
RFQ
RX-4035SA:B PURE SN

Datasheet

RX-4035SA 14-SOIC (0.197", 5.00mm Width) Tube Active Not Verified Time Event Recorder Alarm - - - SPI 2.4V ~ 5.5V 1V ~ 5.5V 2.5µA @ 3V -40°C ~ 85°C Surface Mount - - 14-SOP
BQ3285ES

BQ3285ES

IC RTC CLK/CALENDAR PAR 24SOIC

Texas Instruments

0 -
RFQ
BQ3285ES

Datasheet

- 24-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 4V 300µA @ 5V 0°C ~ 70°C Surface Mount - - 24-SOIC
RX-8731LC:B3 PURE SN

RX-8731LC:B3 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8731LC:B3 PURE SN

Datasheet

- 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Unique ID 80b HH:MM:SS (24 hr) YY-MM-DD-dd I2C 1.7V ~ 5.5V - 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
DS1689S-TRL

DS1689S-TRL

IC RTC CLK/CALENDAR PAR 28SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1689S-TRL

Datasheet

- 28-SOIC (0.337", 8.56mm Width) Tube Obsolete Not Verified Clock/Calendar NVSRAM 114B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.3V, 4.5V ~ 5.5V 2.5V ~ 3.7V 2mA @ 3V, 3mA @ 5V 0°C ~ 70°C Surface Mount - - 28-SOIC
DS1689S+T&R

DS1689S+T&R

IC RTC CLK/CALENDAR PAR 28SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1689S+T&R

Datasheet

- 28-SOIC (0.337", 8.56mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar NVSRAM 114B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.3V, 4.5V ~ 5.5V 2.5V ~ 3.7V 2mA @ 3V, 3mA @ 5V 0°C ~ 70°C Surface Mount - - 28-SOIC
RTC-72423B:3

RTC-72423B:3

IC RTC CLK/CALENDAR PAR 24SOP

EPSON

0 -
RFQ
RTC-72423B:3

Datasheet

- 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
RX8900CEUC3

RX8900CEUC3

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

0 -
RFQ
RX8900CEUC3

Datasheet

RX8900CE 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 2.5V ~ 5.5V 1.6V ~ 5.5V 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C (TA) Surface Mount - - 10-SMD
ISL12020MIRZ-T

ISL12020MIRZ-T

IC RTC CLK/CALENDAR I2C 20DFN

Renesas Electronics Corporation

0 -
RFQ
ISL12020MIRZ-T

Datasheet

- 20-PowerLFDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, SRAM 128B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 14µA ~ 15µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-DFN (5.5x4)
DS12885QN

DS12885QN

IC RTC CLK/CALENDAR PAR 28PLCC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS12885QN

Datasheet

- 28-LCC (J-Lead) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 114B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 4V 15mA @ 4.5V ~ 5.5V -40°C ~ 85°C Surface Mount - - 28-PLCC (11.51x11.51)
X1227S8I-2.7AT1

X1227S8I-2.7AT1

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 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 ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
X1227S8I-2.7AT2

X1227S8I-2.7AT2

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 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 ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
X1227S8I-2.7T1

X1227S8I-2.7T1

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 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 ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
X1227S8I-2.7T2

X1227S8I-2.7T2

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 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 ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
X1227S8IZ-2.7AT1

X1227S8IZ-2.7AT1

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ

-

- 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 ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
X1228S14-2.7T1

X1228S14-2.7T1

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
X1228S14-2.7T1

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 ~ 5V 0°C ~ 70°C Surface Mount - - 14-SOIC
RX-4045SA:AA3

RX-4045SA:AA3

IC RTC CLK/CALENDAR SPI 14SOP

EPSON

0 -
RFQ
RX-4045SA:AA3

Datasheet

RX-4045SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 1.7V ~ 5.5V - 1.2µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
DS17285-3

DS17285-3

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17285-3

Datasheet

- 24-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 2KB HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 2.7V ~ 3.7V 0°C ~ 70°C Through Hole - - 24-PDIP
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