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
DS1685S-3+T&R

DS1685S-3+T&R

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1685S-3+T&R Datasheet - 24-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 3V 0°C ~ 70°C Surface Mount - - 24-SOIC
DS1685E-5+T&R

DS1685E-5+T&R

IC RTC CLK/CALENDAR PAR 24TSSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1685E-5+T&R Datasheet - 24-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 5V 0°C ~ 70°C Surface Mount - - 24-TSSOP
DS1685E-3+T&R

DS1685E-3+T&R

IC RTC CLK/CALENDAR PAR 24TSSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1685E-3+T&R Datasheet - 24-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 3V 0°C ~ 70°C Surface Mount - - 24-TSSOP
RA-4565SA:B3 ROHS

RA-4565SA:B3 ROHS

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RA-4565SA:B3 ROHS Datasheet - 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd 4-Wire Serial 1.6V ~ 5.5V - 1.6µA ~ 2µA @ 3V ~ 5V -40°C ~ 125°C Surface Mount Automotive AEC-Q200 14-SOP
DS1501WN

DS1501WN

IC RTC CLK/CALENDAR PAR 28DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1501WN Datasheet - 28-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K 256B HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 3V ~ 3.6V 2.5V ~ 3.7V 4mA @ 3V ~ 3.6V -40°C ~ 85°C Through Hole - - 28-PDIP
DS1501YN

DS1501YN

IC RTC CLK/CALENDAR PAR 28DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1501YN Datasheet - 28-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K 256B HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 5mA @ 4.5V ~ 5.5V -40°C ~ 85°C Through Hole - - 28-PDIP
RX-4571LCB PURE SN

RX-4571LCB PURE SN

RX-4571LC:B RTC {SN-AG OR SN} VS

EPSON

0 -
RFQ
RX-4571LCB PURE SN Datasheet RX-4571LC 12-TFSOJ (0.094", 2.40mm Width) Bulk Active - Clock/Calendar Alarm, Leap Year - HH:MM:SS YY-MM-DD 3-Wire Serial 1.6V ~ 5.5V 1V ~ 5.5V 950nA ~ 1µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8571LC:B PURE SN

RX-8571LC:B PURE SN

5+/-23PPM RTC BULK - CUT TAPE

EPSON

0 -
RFQ
RX-8571LC:B PURE SN Datasheet RX-8571LC 12-TFSOJ (0.094", 2.40mm Width) Bulk Active - Clock/Calendar Alarm, RAM 16B HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V 1.3V ~ 5.5V 0.4µA @ 3V -40°C ~ 85°C Surface Mount - - 12-VSOJ
MAX6902ETA+T

MAX6902ETA+T

IC RTC CLK/CALENDAR SPI 8TDFN

Analog Devices Inc./Maxim Integrated

0 -
RFQ
MAX6902ETA+T Datasheet - 8-WDFN Exposed Pad Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Y2K 31B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2V ~ 5.5V - 1.05µA ~ 4.2µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 8-TDFN (3x3)
RX-4803SA:UAB PURE SN

RX-4803SA:UAB PURE SN

IC RTC CLK/CALENDAR SPI 14SOP

EPSON

0 -
RFQ
RX-4803SA:UAB PURE SN Datasheet RX-4803SA 14-SOIC (0.197", 5.00mm Width) Tube 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:UA PURE SN

RX-8803SA:UA PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8803SA:UA PURE SN Datasheet RX-8803SA 14-SOIC (0.197", 5.00mm Width) Tube 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
M41T00SC64MY6F

M41T00SC64MY6F

IC RTC CLK/CALENDAR I2C 18SOX

STMicroelectronics

0 -
RFQ
M41T00SC64MY6F Datasheet - 18-SOX, 18-SOIC with Crystal (7.5mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar EEPROM, Leap Year 8KB HH:MM:SS YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 2.5V ~ 35V 100µA (Typ) @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
DS2404B

DS2404B

IC RTC BINARY CTR 1-WIRE 16SSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS2404B Datasheet EconoRAM 16-SSOP (0.209", 5.30mm Width) Tube Obsolete Not Verified Binary Counter Alarm, Square Wave Output, SRAM 512B Binary Binary 1-Wire® and 3-Wire 2.8V ~ 5.5V 2.8V ~ 5.5V 500µA @ 5V -40°C ~ 85°C Surface Mount - - 16-SSOP
DS1501WE/T&R

DS1501WE/T&R

IC RTC CLK/CALENDAR PAR 28TSOP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1501WE/T&R Datasheet - 28-TSSOP (0.465", 11.80mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K 256B HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 3V ~ 3.6V 2.5V ~ 3.7V 4mA @ 3V ~ 3.6V 0°C ~ 70°C Surface Mount - - 28-TSOP
DS1685-5IND+

DS1685-5IND+

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1685-5IND+ Datasheet - 24-DIP (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 5V -40°C ~ 85°C Through Hole - - 24-PDIP
DS1689SN

DS1689SN

IC RTC CLK/CALENDAR PAR 28SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1689SN 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 -40°C ~ 85°C Surface Mount - - 28-SOIC
RX-8581NB:B3 PURE SN

RX-8581NB:B3 PURE SN

IC RTC CLK/CALENDAR I2C 22SON

EPSON

0 -
RFQ
RX-8581NB:B3 PURE SN Datasheet RX-8581NB 22-LFDFN Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 22-SON (6.3x4.8)
RX-8581NB:B3

RX-8581NB:B3

IC RTC CLK/CALENDAR I2C 22SON

EPSON

0 -
RFQ
RX-8581NB:B3 Datasheet RX-8581NB 22-SMD, 20 Leads, Flat Leads Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 22-SON
DS1338C-18#

DS1338C-18#

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1338C-18# Datasheet - 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.71V ~ 5.5V 1.3V ~ 3.7V 100µA @ 1.89V -40°C ~ 85°C Surface Mount - - 16-SOIC
RX-8035SA:AC3 PURE SN

RX-8035SA:AC3 PURE SN

IC RTC TIME EVENT REC I2C 14SOP

EPSON

0 -
RFQ
RX-8035SA:AC3 PURE SN Datasheet RX-8035SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) 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 - - 14-SOP
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