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
RV-3129-C3-32.768KHZ-OPTION-B-TB-QA

RV-3129-C3-32.768KHZ-OPTION-B-TB-QA

IC RTC CLK/CALENDAR I2C 10SON

Micro Crystal AG

19,922 -
RFQ
RV-3129-C3-32.768KHZ-OPTION-B-TB-QA

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger 2B, 8B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.3V ~ 5.5V - 1µA @ 3V -40°C ~ 125°C (TA) Surface Mount Automotive AEC-Q200 10-SON (3.7x2.5)
ISL12057IUZ-T

ISL12057IUZ-T

IC RTC CLK/CALENDAR I2C 8MSOP

Renesas Electronics Corporation

1,571 -
RFQ
ISL12057IUZ-T

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 3.6V - 0.65µA @ 1.8V -40°C ~ 85°C Surface Mount - - 8-MSOP
ISL12057IUZ

ISL12057IUZ

IC RTC CLK/CALENDAR I2C 8MSOP

Renesas Electronics Corporation

1,201 -
RFQ
ISL12057IUZ

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 3.6V - 0.65µA @ 1.8V -40°C ~ 85°C Surface Mount - - 8-MSOP
ISL1208IB8Z-TK

ISL1208IB8Z-TK

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

10,275 -
RFQ
ISL1208IB8Z-TK

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar 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 - - 8-SOIC
RV-3028-C7 32.768KHZ 1PPM-TA-QC

RV-3028-C7 32.768KHZ 1PPM-TA-QC

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

29,131 -
RFQ
RV-3028-C7 32.768KHZ 1PPM-TA-QC

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle Charger 2B, 43B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.1V ~ 5.5V 1.1V ~ 5.5V 0.06µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 8-SON (3.2x1.5)
R2025S-E2-FE

R2025S-E2-FE

IC RTC CLK/CALENDAR I2C 14SOP

Nisshinbo Micro Devices Inc.

6,632 -
RFQ
R2025S-E2-FE

Datasheet

- 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V - 120µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
PCA2131TF/Q900Y

PCA2131TF/Q900Y

IC RTC W/XTAL AUTO HLSON16

NXP USA Inc.

1,246 -
RFQ
PCA2131TF/Q900Y

Datasheet

- - Tape & Reel (TR) Active Not Verified - - - - - - - - - - - - - -
RV-3028-C7 32.768KHZ 1PPM-TA-QA

RV-3028-C7 32.768KHZ 1PPM-TA-QA

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

84,366 -
RFQ
RV-3028-C7 32.768KHZ 1PPM-TA-QA

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle Charger 2B, 43B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.1V ~ 5.5V 1.1V ~ 5.5V 0.06µA @ 3V -40°C ~ 85°C (TA) Surface Mount Automotive AEC-Q200 8-SON (3.2x1.5)
RV-2123-C2-32.768KHZ-20PPM-TA-QC

RV-2123-C2-32.768KHZ-20PPM-TA-QC

IC RTC CLK/CALENDAR SPI 10SON

Micro Crystal AG

39,417 -
RFQ
RV-2123-C2-32.768KHZ-20PPM-TA-QC

Datasheet

C2 10-TDFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Programmable Clock Output, Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 4-Wire Serial 1.1V ~ 5.5V - 0.18µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (5x3.2)
M41T94MQ6F

M41T94MQ6F

IC RTC CLK/CALENDAR SPI 16SO

STMicroelectronics

5,978 -
RFQ
M41T94MQ6F

Datasheet

- 16-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, NVRAM, Square Wave Output, Watchdog Timer 44B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 2.7V ~ 5.5V 2.5V ~ 3.5V 1.4mA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SO
RV-8803-C7-32.768KHZ-3PPM-TA-QC

RV-8803-C7-32.768KHZ-3PPM-TA-QC

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

9,374 -
RFQ
RV-8803-C7-32.768KHZ-3PPM-TA-QC

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer 1B HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.5V ~ 5.5V - 0.35µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 8-SON (3.2x1.5)
ISL1208IU8Z-TK

ISL1208IU8Z-TK

IC RTC CLK/CALENDAR I2C 8MSOP

Renesas Electronics Corporation

4,628 -
RFQ
ISL1208IU8Z-TK

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar 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 - - 8-MSOP
RV-8803-C7-32.768KHZ-3PPM-TA-QA

RV-8803-C7-32.768KHZ-3PPM-TA-QA

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

19,258 -
RFQ
RV-8803-C7-32.768KHZ-3PPM-TA-QA

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer 1B HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.5V ~ 5.5V - 0.35µA @ 3V -40°C ~ 85°C (TA) Surface Mount Automotive AEC-Q200 8-SON (3.2x1.5)
M41T93RMY6F

M41T93RMY6F

IC RTC CLK/CALENDAR SPI 18SOX

STMicroelectronics

8,712 -
RFQ
M41T93RMY6F

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 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
M41T83ZMY6F

M41T83ZMY6F

IC RTC CLK/CALENDAR I2C 18SOX

STMicroelectronics

885 -
RFQ
M41T83ZMY6F

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 I2C, 2-Wire Serial 2.38V ~ 5.5V 2V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
PCF2127T/2Y

PCF2127T/2Y

IC RTC CLOCK/CALENDAR I2C 16SO

NXP USA Inc.

1,052 -
RFQ
PCF2127T/2Y

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer 512B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 4.2V 1.8V ~ 4.2V 1.5µA @ 3.3V -40°C ~ 85°C Surface Mount - - 16-SO
RV-3129-C3-32.768KHZ-OPTION-B-TA-QC

RV-3129-C3-32.768KHZ-OPTION-B-TA-QC

IC RTC CLK/CALENDAR I2C 10SON

Micro Crystal AG

13,432 -
RFQ
RV-3129-C3-32.768KHZ-OPTION-B-TA-QC

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger 2B, 8B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.3V ~ 5.5V - 1µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (3.7x2.5)
PCF2127AT/2Y

PCF2127AT/2Y

IC RTC CLOCK/CALENDAR I2C 20SO

NXP USA Inc.

5,658 -
RFQ
PCF2127AT/2Y

Datasheet

- 20-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer 512B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 4.2V 1.8V ~ 4.2V 1.5µA @ 3.3V -40°C ~ 85°C Surface Mount - - 20-SO
RV-3149-C3-32.768KHZ-OPTION-B-TA-QC

RV-3149-C3-32.768KHZ-OPTION-B-TA-QC

IC RTC CLK/CALENDAR SPI 10SON

Micro Crystal AG

4,648 -
RFQ
RV-3149-C3-32.768KHZ-OPTION-B-TA-QC

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger 2B, 8B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 4-Wire Serial 1.3V ~ 5.5V - 1µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (3.7x2.5)
RV-8523-C3-32.768KHZ-20PPM-TA-QC

RV-8523-C3-32.768KHZ-20PPM-TA-QC

IC RTC CLK/CALENDAR I2C 10SON

Micro Crystal AG

8,898 -
RFQ
RV-8523-C3-32.768KHZ-20PPM-TA-QC

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Battery Switch, Leap Year, Programmable Clock Output, Timer, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.2V ~ 5.5V - 0.18µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (3.7x2.5)
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