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
ISL12008IB8Z

ISL12008IB8Z

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

3,483 -
RFQ
ISL12008IB8Z

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS:hh (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 - - 8-SOIC
RX-8571LCB0  PURE SN

RX-8571LCB0 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

355 -
RFQ
RX-8571LCB0  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
1338-31DCGI8

1338-31DCGI8

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

1,817 -
RFQ
1338-31DCGI8

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 3.3V ~ 5.5V 1.3V ~ 3.7V 5µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-SOIC
M41T83ZQA6F

M41T83ZQA6F

IC RTC CLK/CALENDAR I2C 16QFN

STMicroelectronics

1,000 -
RFQ
M41T83ZQA6F

Datasheet

- 16-VQFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.38V ~ 5.5V 2V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 16-QFN (4x4)
RX8804CE XB0

RX8804CE XB0

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

1,916 -
RFQ
RX8804CE XB0

Datasheet

RX8804CE 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 ~ 1.6µA @ 3V ~ 5V -40°C ~ 105°C Surface Mount - - 10-SMD
1339-31DCGI

1339-31DCGI

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

218 -
RFQ
1339-31DCGI

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube 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 3.3V ~ 5.5V 1.3V ~ 3.7V 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-SOIC
M41T93SQA6F

M41T93SQA6F

IC RTC CLK/CALENDAR SPI 16QFN

STMicroelectronics

618 -
RFQ
M41T93SQA6F

Datasheet

- 16-VQFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 3V ~ 5.5V 1.8V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 16-QFN (4x4)
M41T93ZQA6F

M41T93ZQA6F

IC RTC CLK/CALENDAR SPI 16QFN

STMicroelectronics

7,717 -
RFQ
M41T93ZQA6F

Datasheet

- 16-VQFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 2.38V ~ 5.5V 1.8V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 16-QFN (4x4)
R2045S-E2-FE

R2045S-E2-FE

IC RTC CLK/CALENDAR 4 WIRE 8HSOP

Nisshinbo Micro Devices Inc.

8,866 -
RFQ
R2045S-E2-FE

Datasheet

- 8-SOIC (0.173", 4.40mm Width) Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial, 4-Wire Serial 1.7V ~ 5.5V - 1.8µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 8-HSOP-E
RX-8571SA:B0 PURE SN

RX-8571SA:B0 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

605 -
RFQ
RX-8571SA:B0 PURE SN

Datasheet

RX-8571SA 14-SOIC (0.197", 5.00mm 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 - - 14-SOP
RX-4571SA:B3 PURE SN

RX-4571SA:B3 PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

535 -
RFQ
RX-4571SA:B3 PURE SN

Datasheet

RX-4571SA 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 3-Wire Serial 1.6V ~ 5.5V - 0.95µA ~ 1µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
M41T93ZMY6F

M41T93ZMY6F

IC RTC CLK/CALENDAR SPI 18SOX

STMicroelectronics

5,468 -
RFQ
M41T93ZMY6F

Datasheet

- 18-SOX, 18-SOIC with Crystal (7.5mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 2.38V ~ 5.5V 1.8V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
M41T93SMY6F

M41T93SMY6F

IC RTC CLK/CALENDAR SPI 18SOX

STMicroelectronics

3,776 -
RFQ
M41T93SMY6F

Datasheet

- 18-SOX, 18-SOIC with Crystal (7.5mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 3V ~ 5.5V 1.8V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
RX8900SA:UA0 PURE SN

RX8900SA:UA0 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

1,630 -
RFQ
RX8900SA:UA0 PURE SN

Datasheet

RX8900SA 14-SOIC (0.197", 5.00mm Width) 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 - - 14-SOP
ECS-RTC-3225-5609-TR

ECS-RTC-3225-5609-TR

IC RTC CLK/CALENDAR I2C 10SMD

ECS Inc.

4,506 -
RFQ
ECS-RTC-3225-5609-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 3µA @ 5V -40°C ~ 85°C Surface Mount - - 10-SMD
M41T81SMY6F

M41T81SMY6F

IC RTC CLK/CALENDAR I2C 18SOX

STMicroelectronics

3,896 -
RFQ
M41T81SMY6F

Datasheet

- 18-SOX, 18-SOIC with Crystal (7.5mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Watchdog Timer - HH:MM:SS:hh (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 2V ~ 3.5V 100µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
RX4901CE XB C06

RX4901CE XB C06

IC RTC CLK/CALENDAR SPI 10SMD

EPSON

6,400 -
RFQ
RX4901CE XB 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
RX8901CE XB B06

RX8901CE XB B06

IC RTC CLK/CALENDAR I2C 10SMD

EPSON

665 -
RFQ
RX8901CE XB 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
DS1341U+

DS1341U+

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

595 -
RFQ
DS1341U+

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 - 0.5µA ~ 0.6µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
RX-8803SA:UB3 PURE SN

RX-8803SA:UB3 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

236 -
RFQ
RX-8803SA:UB3 PURE SN

Datasheet

RX-8803LC 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - - YY-MM-DD I2C, 2-Wire Serial 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
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