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
BQ4802LYPWR

BQ4802LYPWR

IC RTC CLK/CALENDAR PAR 28TSSOP

Texas Instruments

293 -
RFQ
BQ4802LYPWR

Datasheet

- 28-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.6V 2.4V ~ 4V 1.5mA (Typ) @ 2.7 V ~ 3.6 V 0°C ~ 70°C Surface Mount - - 28-TSSOP
DS1672U-33+T&R

DS1672U-33+T&R

IC RTC BINARY COUNTER I2C 8UMAX

Analog Devices Inc./Maxim Integrated

1,715 -
RFQ
DS1672U-33+T&R

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Binary Counter Trickle-Charger - Binary Binary I2C, 2-Wire Serial 2.97V ~ 3.63V 1.3V ~ 3.63V 500µA @ 3.63V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
RX4901CE XS B06

RX4901CE XS B06

IC RTC CLK/CALENDAR SPI 10SMD

EPSON

2,000 -
RFQ
RX4901CE XS B06

Datasheet

RX4901CE 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD SPI, 3-Wire Serial 1.6V ~ 5.5V - 1.5µA @ 3V -40°C ~ 105°C (TA) Surface Mount - - 10-SMD
RX4901CE XS A06

RX4901CE XS A06

IC RTC CLK/CALENDAR SPI 10SMD

EPSON

1,943 -
RFQ
RX4901CE XS A06

Datasheet

RX4901CE 10-SMD, No Lead Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm - HH:MM:SS YY-MM-DD SPI, 3-Wire Serial 1.6V ~ 5.5V - 1.5µA @ 3V -40°C ~ 105°C (TA) Surface Mount - - 10-SMD
RX4901CE XS D06

RX4901CE XS D06

IC RTC CLK/CALENDAR SPI 10SMD

EPSON

1,941 -
RFQ
RX4901CE XS D06

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
BQ4802LYDWR

BQ4802LYDWR

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

781 -
RFQ
BQ4802LYDWR

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.6V 2.4V ~ 4V 1.5mA (Typ) @ 2.7 V ~ 3.6 V 0°C ~ 70°C Surface Mount - - 28-SOIC
RX-8803LC:UB0 PURE SN

RX-8803LC:UB0 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

1,000 -
RFQ
RX-8803LC:UB0 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
DS1392U-33+

DS1392U-33+

IC RTC CLK/CALENDAR SER 10UMAX

Analog Devices Inc./Maxim Integrated

389 -
RFQ
DS1392U-33+

Datasheet

- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2.97V ~ 5.5V 1.3V ~ 5.5V 175µA @ 2.97V ~ 5.5V -40°C ~ 85°C Surface Mount - - 10-uMAX/uSOP
RX8900SA:UB3 PURE SN

RX8900SA:UB3 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

495 -
RFQ
RX8900SA:UB3 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
DS1343E-3+T&R

DS1343E-3+T&R

IC RTC CLK/CALENDAR SPI 20TSSOP

Analog Devices Inc./Maxim Integrated

1,506 -
RFQ
DS1343E-3+T&R

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2.7V ~ 5.5V 1.3V ~ 5.5V - -40°C ~ 85°C Surface Mount - - 20-TSSOP
DS1344D-3+T&R

DS1344D-3+T&R

IC RTC CLK/CALENDAR SPI 14TDFN

Analog Devices Inc./Maxim Integrated

3,895 -
RFQ
DS1344D-3+T&R

Datasheet

- 14-WFDFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2.7V ~ 5.5V 1.3V ~ 5.5V - -40°C ~ 85°C Surface Mount - - 14-TDFN (3x3)
DS1343E-3+

DS1343E-3+

IC RTC CLK/CALENDAR SPI 20TSSOP

Analog Devices Inc./Maxim Integrated

146 -
RFQ
DS1343E-3+

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2.7V ~ 5.5V 1.3V ~ 5.5V - -40°C ~ 85°C Surface Mount - - 20-TSSOP
DS1685E-5+

DS1685E-5+

IC RTC CLK/CALENDAR PAR 24TSSOP

Analog Devices Inc./Maxim Integrated

3 -
RFQ
DS1685E-5+

Datasheet

- 24-TSSOP (0.173", 4.40mm Width) Tube 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+

DS1685E-3+

IC RTC CLK/CALENDAR PAR 24TSSOP

Analog Devices Inc./Maxim Integrated

133 -
RFQ
DS1685E-3+

Datasheet

- 24-TSSOP (0.173", 4.40mm Width) Tube 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
DS1558Y+

DS1558Y+

IC RTC CLK/CALENDAR PAR 48LQFP

Analog Devices Inc./Maxim Integrated

245 -
RFQ
DS1558Y+

Datasheet

- 48-LQFP Tray Active Not Verified Clock/Calendar Alarm, Leap Year, Watchdog Timer, Y2K - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 6mA @ 5V -40°C ~ 85°C Surface Mount - - 48-LQFP (7x7)
DS1685-5+

DS1685-5+

IC RTC CLK/CALENDAR PAR 24DIP

Analog Devices Inc./Maxim Integrated

29 -
RFQ
DS1685-5+

Datasheet

- 24-DIP (0.600", 15.24mm) Tube 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 Through Hole - - 24-PDIP
DS12885Q+

DS12885Q+

IC RTC CLK/CALENDAR PAR 28PLCC

Analog Devices Inc./Maxim Integrated

75 -
RFQ
DS12885Q+

Datasheet

- 28-LCC (J-Lead) Tube Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 114B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 4V 15mA @ 4.5V ~ 5.5V 0°C ~ 70°C Surface Mount - - 28-PLCC (11.51x11.51)
DS17285SN-3+

DS17285SN-3+

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

166 -
RFQ
DS17285SN-3+

Datasheet

- 24-SOIC (0.295", 7.50mm Width) Tube 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 -40°C ~ 85°C Surface Mount - - 24-SOIC
DS1315S-33+

DS1315S-33+

IC RTC PHANTOM CHIP PAR 16SOIC

Analog Devices Inc./Maxim Integrated

91 -
RFQ
DS1315S-33+

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Phantom Time Chip Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 3V ~ 3.6V 2.5V ~ 3.7V 1.1mA @ 3.3V 0°C ~ 70°C Surface Mount - - 16-SOIC
M48T37Y-70MH1F

M48T37Y-70MH1F

IC RTC CLK/CALENDAR PAR 44SOH

STMicroelectronics

269 -
RFQ
M48T37Y-70MH1F

Datasheet

Timekeeper® 44-BSOP (0.337", 8.56mm Width) requires SNAPHAT Tape & Reel (TR) Active 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 - - 44-SOH
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