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
RTT21064

RTT21064

XTAL OSC RTC 32.768KHZ SMD

Raltron Electronics

0 -
RFQ
RTT21064 Datasheet - 10-SMD, No Lead Tape & Reel (TR) Active - Clock/Calendar Alarm, Leap Year, RAM - HH:MM:SS YY-MM-DD I2C 1.25V ~ 5.5V 1.2V ~ 5.5V 5µA ~ 7.8µA @ 1.2V ~ 5.5V -40°C ~ 85°C Surface Mount - - 10-SMD
RX-8803LC:UC3 PURE SN

RX-8803LC:UC3 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8803LC:UC3 PURE SN Datasheet RX-8803LC 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-4803LC:UB3 PURE SN

RX-4803LC:UB3 PURE SN

IC RTC CLK/CALENDAR SPI 12VSOJ

EPSON

0 -
RFQ
RX-4803LC:UB3 PURE SN Datasheet RX-4803LC 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd SPI 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8035LC:AA PURE SN

RX-8035LC:AA PURE SN

IC RTC EVENT REC I2C 12VSOJ

EPSON

0 -
RFQ
RX-8035LC:AA PURE SN Datasheet RX-8035LC 12-TFSOJ (0.094", 2.40mm Width) Strip Active Not Verified Time Event Recorder Alarm - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.4V ~ 5.5V 1V ~ 5.5V 2.5µA @ 3V -40°C ~ 85°C Surface Mount - - 12-VSOJ
DS17285S-3+T&R

DS17285S-3+T&R

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17285S-3+T&R Datasheet - 24-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active 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 Surface Mount - - 24-SOIC
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) Active 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
X1228S14Z-2.7T1

X1228S14Z-2.7T1

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

0 -
RFQ
X1228S14Z-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
RTC-8564NB:BB ROHS

RTC-8564NB:BB ROHS

IC RTC CLK/CALENDAR I2C 22SON

EPSON

0 -
RFQ
RTC-8564NB:BB ROHS Datasheet - 22-LFDFN Strip Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD-dd I2C 1.8V ~ 5.5V - 0.7µA ~ 0.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 22-SON (6.3x4.8)
RX8804CE XAB

RX8804CE XAB

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

0 -
RFQ
RX8804CE XAB Datasheet RX8804CE 10-SMD, No Lead Bulk Active Not Verified Clock/Calendar Alarm, Watchdog Timer - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V 1.5V ~ 5.5V 1.5µA ~ 1.6µA @ 3V ~ 5V -40°C ~ 105°C (TA) Surface Mount - - 10-SMD
M48T59Y-70MH1E

M48T59Y-70MH1E

IC RTC CLK/CALENDAR PAR 28SOH

STMicroelectronics

0 -
RFQ
M48T59Y-70MH1E Datasheet Timekeeper® 28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Watchdog Timer - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 3mA @ 4.5V ~ 5.5V 0°C ~ 70°C Surface Mount - - 28-SOH
DS17885-5

DS17885-5

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17885-5 Datasheet - 24-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 8KB 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 Through Hole - - 24-PDIP
DS1284QN+

DS1284QN+

IC RTC CLK/CALENDAR PAR 28PLCC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1284QN+ Datasheet - 28-LCC (J-Lead) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 50B HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.4V ~ 3.5V 7mA @ 5V -40°C ~ 85°C Surface Mount - - 28-PLCC (11.51x11.51)
RX-4803SA:UA3 PURE SN

RX-4803SA:UA3 PURE SN

IC RTC CLK/CALENDAR SPI 14SOP

EPSON

0 -
RFQ
RX-4803SA:UA3 PURE SN Datasheet RX-4803SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd SPI 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-8803SA:UA3 PURE SN

RX-8803SA:UA3 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8803SA:UA3 PURE SN Datasheet RX-8803SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
DS17885-3

DS17885-3

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS17885-3 Datasheet - 24-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 8KB 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
RX-8803LC:UC PURE SN

RX-8803LC:UC PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8803LC:UC PURE SN Datasheet RX-8803LC 12-TFSOJ (0.094", 2.40mm Width) Strip Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
DS32B35-33IND#

DS32B35-33IND#

IC RTC CLK/CALENDAR I2C 20SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS32B35-33IND# Datasheet - 20-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, FRAM, Leap Year, Square Wave Output, TCXO/Crystal 2KB HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 3.63V 2.3V ~ 3.6V 110µA @ 3.63V -40°C ~ 85°C Surface Mount - - 20-SOIC
RX-4803LC:UBB PURE SN

RX-4803LC:UBB PURE SN

IC RTC CLK/CALENDAR SPI 12VSOJ

EPSON

0 -
RFQ
RX-4803LC:UBB PURE SN Datasheet RX-4803LC 12-TFSOJ (0.094", 2.40mm Width) Strip Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd SPI 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8803LCUB PURE SN BULK

RX-8803LCUB PURE SN BULK

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8803LCUB PURE SN BULK Datasheet RX-8803LC 12-TFSOJ (0.094", 2.40mm Width) Bulk Active Not Verified 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
DS1384FP-12

DS1384FP-12

IC RTC CLK/CALENDAR PAR 44MQFP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1384FP-12 Datasheet - 44-QFP Bag Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Watchdog Timer 50B HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.4V ~ 4V 3mA @ 5V 0°C ~ 70°C Surface Mount - - 44-MQFP (10x10)
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