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
DS17285S-5/T&R

DS17285S-5/T&R

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17285S-5/T&R

Datasheet

- 24-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) 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 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 4.5V ~ 5.5V 0°C ~ 70°C Surface Mount - - 24-SOIC
DS12885QN/T&R

DS12885QN/T&R

IC RTC CLK/CALENDAR PAR 28PLCC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS12885QN/T&R

Datasheet

- 28-LCC (J-Lead) Tape & Reel (TR) 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)
ISL12029IB27Z-T

ISL12029IB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12029IB27Z-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
ISL12028IV27Z-T

ISL12028IV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

0 -
RFQ
ISL12028IV27Z-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
ISL12027IB27Z-T

ISL12027IB27Z-T

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

0 -
RFQ
ISL12027IB27Z-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
ISL1221IUZ

ISL1221IUZ

IC RTC EVENT REC I2C 10MSOP

Renesas Electronics Corporation

3 -
RFQ
ISL1221IUZ

Datasheet

- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Tube Obsolete Not Verified Time Event Recorder Alarm, Leap Year, SRAM 2B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 4µA ~ 6µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 10-MSOP
RX-4035SA:AAB PURE SN

RX-4035SA:AAB PURE SN

IC RTC TIME EVENT REC SPI 14SOP

EPSON

0 -
RFQ
RX-4035SA:AAB 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
DS1558W-TRL

DS1558W-TRL

IC RTC CLK/CALENDAR PAR 48LQFP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1558W-TRL

Datasheet

- 48-LQFP Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Watchdog Timer, Y2K - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 2.5V ~ 3.7V 2mA @ 3.3V -40°C ~ 85°C Surface Mount - - 48-LQFP (7x7)
DS1558Y-TRL

DS1558Y-TRL

IC RTC CLK/CALENDAR PAR 48LQFP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1558Y-TRL

Datasheet

- 48-LQFP Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Watchdog Timer, Y2K - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 6mA @ 5V -40°C ~ 85°C Surface Mount - - 48-LQFP (7x7)
RX-4803LCUA0 PURE SN

RX-4803LCUA0 PURE SN

RX-4803LC:UA0 PURE SN RTC +/-3.4

EPSON

0 -
RFQ
RX-4803LCUA0 PURE SN

Datasheet

RX-4803LC 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Active - Clock/Calendar Alarm - HH:MM:SS YY-MM-DD 4-Wire Serial 1.6V ~ 5.5V 1.6V ~ 5.5V 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8803LCUA0 PURE SN

RX-8803LCUA0 PURE SN

RX-8803LC:UA0 PURE SN I2C-BUS RT

EPSON

0 -
RFQ
RX-8803LCUA0 PURE SN

Datasheet

RX-8803LC 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Active - Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V 1.6V ~ 5.5V 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX8900SA:UBB PURE SN

RX8900SA:UBB PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX8900SA:UBB PURE SN

Datasheet

RX8900SA 14-SOIC (0.197", 5.00mm Width) Bulk Active Not Verified Clock/Calendar Alarm - HH:MM:SS (24 hr) YY-MM-DD-dd I2C 2.5V ~ 5.5V 1.6V ~ 5.5V 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX8900SA:UCB PURE SN

RX8900SA:UCB PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX8900SA:UCB PURE SN

Datasheet

RX8900SA 14-SOIC (0.197", 5.00mm Width) Bulk Active Not Verified Clock/Calendar Alarm - HH:MM:SS (24 hr) YY-MM-DD-dd I2C 2.5V ~ 5.5V 1.6V ~ 5.5V 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RTC-8564JE:3

RTC-8564JE:3

IC RTC CLK/CALENDAR I2C 20VSOJ

EPSON

0 -
RFQ
RTC-8564JE:3

Datasheet

- 20-LSSOJ (0.213", 5.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Y2K - HH:MM:SS YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.7µA ~ 0.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
RX8900CE:UBB

RX8900CE:UBB

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

0 -
RFQ
RX8900CE:UBB

Datasheet

RX8900CE 10-SMD, No Lead Bulk Active Not Verified Clock/Calendar Alarm - HH:MM:SS (24 hr) YY-MM-DD-dd I2C 2.5V ~ 5.5V 1.6V ~ 5.5V 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 10-SMD
RX8900CEUCB

RX8900CEUCB

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

0 -
RFQ
RX8900CEUCB

Datasheet

RX8900CE 10-SMD, No Lead Bulk 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
MAX6917EO33+T

MAX6917EO33+T

IC RTC CLK/CAL/SUPER I2C 20QSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

- 20-SSOP (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar/Supervisor - 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3V ~ 3.6V - - -40°C ~ 85°C Surface Mount - - 20-QSOP
MAX6916EO30+T

MAX6916EO30+T

IC RTC CLK/CAL/SUPER SPI 20QSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

- 20-SSOP (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar/Supervisor - 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 3-Wire Serial 2.7V ~ 3.3V - - - Surface Mount - - 20-QSOP
MAX6916EO33+T

MAX6916EO33+T

IC RTC CLK/CAL/SUPER SPI 20QSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

- 20-SSOP (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar/Supervisor - 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 3-Wire Serial 3V ~ 3.6V - - - Surface Mount - - 20-QSOP
MAX6916EO50+T

MAX6916EO50+T

IC RTC CLK/CAL/SUPER SPI 20QSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

- 20-SSOP (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar/Supervisor - 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 3-Wire Serial 4.5V ~ 5.5V - - - Surface Mount - - 20-QSOP
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