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
RTC-8564JE:B0 ROHS

RTC-8564JE:B0 ROHS

IC RTC CLK/CALENDAR I2C 20VSOJ

EPSON

1,183 -
RFQ
RTC-8564JE:B0 ROHS

Datasheet

RTC-8564JE 20-LSSOJ (0.213", 5.40mm Width) Tape & Reel (TR) Active 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
DS1337S+

DS1337S+

IC RTC CLK/CALENDAR I2C 8SOIC

Analog Devices Inc./Maxim Integrated

1,157 -
RFQ
DS1337S+

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.6µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 8-SOIC
RX8900CE:UA0

RX8900CE:UA0

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

196 -
RFQ
RX8900CE:UA0

Datasheet

RX8900CE 10-SMD, No Lead Tape & Reel (TR) 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
DS1302SN+

DS1302SN+

IC RTC CLK/CALENDAR SER 8SOIC

Analog Devices Inc./Maxim Integrated

4,437 -
RFQ
DS1302SN+

Datasheet

- 8-SOIC (0.209", 5.30mm Width) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Trickle-Charger 31B HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2V ~ 5.5V 2V ~ 5.5V 0.3µA ~ 1µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 8-SOIC
DS1347T+T&R

DS1347T+T&R

IC RTC CLK/CALENDAR SPI 8TDFN

Analog Devices Inc./Maxim Integrated

2,188 -
RFQ
DS1347T+T&R

Datasheet

- 8-WDFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, SRAM - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2V ~ 5.5V - 0.7µA ~ 0.8µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 8-TDFN (3x3)
RX8901CE XS B06

RX8901CE XS B06

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

1,575 -
RFQ
RX8901CE XS B06

Datasheet

RX8901CE 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5.5V - 1.5µA @ 3V -40°C ~ 105°C (TA) Surface Mount - - 10-SMD
MAX31328NELB+

MAX31328NELB+

IC RTC CLK/CALENDAR I2C 10LGA

Analog Devices Inc./Maxim Integrated

3,313 -
RFQ
MAX31328NELB+

Datasheet

- 10-LLGA Tray Active Not Verified Clock/Calendar Alarm - HH:MM:SS (12/24 hr) YY-MM-DD I2C 2.3V ~ 5.5V 2.3V ~ 5.5V 3µA ~ 3.5µA @ 3V ~ 5.5V -40°C ~ 85°C Surface Mount - - 10-LGA (5x5)
DS1394U-33+T&R

DS1394U-33+T&R

IC RTC CLK/CALENDAR SPI 10UMAX

Analog Devices Inc./Maxim Integrated

6,158 -
RFQ
DS1394U-33+T&R

Datasheet

- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd SPI 2.97V ~ 5.5V 1.3V ~ 5.5V 175µA @ 2.97V ~ 5.5V -40°C ~ 85°C Surface Mount - - 10-uMAX/uSOP
DS1338Z-3+T&R

DS1338Z-3+T&R

IC RTC CLK/CALENDAR I2C 8SOIC

Analog Devices Inc./Maxim Integrated

5,292 -
RFQ
DS1338Z-3+T&R

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) 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 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.3V -40°C ~ 85°C Surface Mount - - 8-SOIC
RX-4045SAAA3 PURE SN

RX-4045SAAA3 PURE SN

IC RTC CLK/CALENDAR SPI 14SOP

EPSON

4,321 -
RFQ
RX-4045SAAA3 PURE SN

Datasheet

RX-4045SA 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - 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
ISL12022IBZ-T7A

ISL12022IBZ-T7A

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

300 -
RFQ
ISL12022IBZ-T7A

Datasheet

- 8-SOIC (0.154", 3.90mm Width) 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 - - 8-SOIC
ECS-RTC-3225-5699HS-TR

ECS-RTC-3225-5699HS-TR

IC RTC CLK/CALENDAR I2C 10SMD

ECS Inc.

457 -
RFQ
ECS-RTC-3225-5699HS-TR

Datasheet

- 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar - - HH:MM:SS YY-MM-DD I2C 1.6V ~ 5V, 2.5V ~ 5V 1.6V ~ 5V 0.5µA @ 3V -40°C ~ 85°C Surface Mount - - 10-SMD
DS1308U-33+T

DS1308U-33+T

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

6,990 -
RFQ
DS1308U-33+T

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) 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 3V ~ 5.5V 1.3V ~ 5.5V 125µA ~ 200µA @ 3V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
RX-8571LC:B3 PURE SN

RX-8571LC:B3 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

4,603 -
RFQ
RX-8571LC:B3 PURE SN

Datasheet

RX-8571LC 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, RAM 16B HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.6V ~ 5.5V - 0.55µA ~ 0.6µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
DS1339U-3+T&R

DS1339U-3+T&R

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

12,051 -
RFQ
DS1339U-3+T&R

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.3V ~ 3.7V 150µA @ 3.3V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
MAX31343ETAY+

MAX31343ETAY+

ACCURATE/ROBUST RTC WITH INTEGRA

Analog Devices Inc./Maxim Integrated

868 -
RFQ
MAX31343ETAY+

Datasheet

- 8-VFBGA, WLBGA Tray Active - Clock/Calendar Alarm, Leap Year, RAM, Square Wave Output, SRAM, Trickle Charger 64B HH:MM:SS (24 hr) YY-MM-DD-dd I2C, Serial 1.6V ~ 5.5V 1.6V ~ 5.5V 1.2µA ~ 2µA @ 1.6V ~ 5.5V -40°C ~ 85°C (TA) Surface Mount - - 8-WLP (2.07x2.27)
RX4901CE XS C06

RX4901CE XS C06

IC RTC CLK/CALENDAR SPI 10SMD

EPSON

598 -
RFQ
RX4901CE XS C06

Datasheet

RX4901CE 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD SPI, 4-Wire Serial 1.6V ~ 5.5V - 1.5µA @ 3V -40°C ~ 105°C (TA) Surface Mount - - 10-SMD
DS1307N+

DS1307N+

IC RTC CLOCK/CALENDAR I2C 8DIP

Analog Devices Inc./Maxim Integrated

407 -
RFQ
DS1307N+

Datasheet

- 8-DIP (0.300", 7.62mm) 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 4.5V ~ 5.5V 2V ~ 3.5V 200µA @ 5V -40°C ~ 85°C Through Hole - - 8-PDIP
DS1338Z-3+

DS1338Z-3+

IC RTC CLK/CALENDAR I2C 8SOIC

Analog Devices Inc./Maxim Integrated

2,406 -
RFQ
DS1338Z-3+

Datasheet

- 8-SOIC (0.154", 3.90mm 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 2.7V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.3V -40°C ~ 85°C Surface Mount - - 8-SOIC
DS1302N+

DS1302N+

IC RTC CLK/CALENDAR SER 8DIP

Analog Devices Inc./Maxim Integrated

399 -
RFQ
DS1302N+

Datasheet

- 8-DIP (0.300", 7.62mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Trickle-Charger 31B HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2V ~ 5.5V 2V ~ 5.5V 0.3µA ~ 1µA @ 2V ~ 5V -40°C ~ 85°C Through Hole - - 8-PDIP
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