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
DS1558W+

DS1558W+

IC RTC CLK/CALENDAR PAR 48LQFP

Analog Devices Inc./Maxim Integrated

253 -
RFQ
DS1558W+

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 2.97V ~ 3.63V 2.5V ~ 3.7V 2mA @ 3.3V -40°C ~ 85°C Surface Mount - - 48-LQFP (7x7)
DS1374C-33#

DS1374C-33#

IC RTC BINARY COUNTER I2C 16SOIC

Analog Devices Inc./Maxim Integrated

1,800 -
RFQ
DS1374C-33#

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Binary Counter Alarm, Square Wave Output, Trickle-Charger, Watchdog Timer - Binary Binary I2C, 2-Wire Serial 2.97V ~ 5.5V 1.3V ~ 5.5V 175µA @ 2.97V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
ISL12020MIRZ-T7A

ISL12020MIRZ-T7A

IC RTC CLK/CALENDAR I2C 20DFN

Renesas Electronics Corporation

3,025 -
RFQ
ISL12020MIRZ-T7A

Datasheet

- 20-PowerLFDFN 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 - - 20-DFN (5.5x4)
DS3232S#T&R

DS3232S#T&R

IC RTC CLK/CALENDAR I2C 20SOIC

Analog Devices Inc./Maxim Integrated

1,000 -
RFQ
DS3232S#T&R

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 236B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.3V ~ 5.5V 2.3V ~ 5.5V 120µA ~ 160µA @ 3.3V ~ 5.5V 0°C ~ 70°C Surface Mount - - 20-SOIC
DS1685SN-5+

DS1685SN-5+

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

124 -
RFQ
DS1685SN-5+

Datasheet

- 24-SOIC (0.295", 7.50mm 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 -40°C ~ 85°C Surface Mount - - 24-SOIC
DS12885S+

DS12885S+

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

49 -
RFQ
DS12885S+

Datasheet

- 24-SOIC (0.295", 7.50mm Width) 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 - - 24-SOIC
DS1673E-3+

DS1673E-3+

IC RTC SYST CTRLR SER 20TSSOP

Analog Devices Inc./Maxim Integrated

105 -
RFQ
DS1673E-3+

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Portable System Controller Alarm, Leap Year, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2.7V ~ 3.3V 2.5V ~ 3.7V 100µA @ 3V 0°C ~ 70°C Surface Mount - - 20-TSSOP
DS1670E+

DS1670E+

IC RTC SYST CTRLR SER 20TSSOP

Analog Devices Inc./Maxim Integrated

49 -
RFQ
DS1670E+

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Portable System Controller Alarm, Leap Year, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2.97V ~ 3.63V 2.5V ~ 3.7V 100µA @ 3.3V 0°C ~ 70°C Surface Mount - - 20-TSSOP
BQ4802YDWR

BQ4802YDWR

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

517 -
RFQ
BQ4802YDWR

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 4.5V ~ 5.5V 2.4V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V 0°C ~ 70°C Surface Mount - - 28-SOIC
RX-8803LC:UA3 PURE SN

RX-8803LC:UA3 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

786 -
RFQ
RX-8803LC:UA3 PURE SN

Datasheet

RX-8803LC 12-TFSOJ (0.094", 2.40mm 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 - - 12-VSOJ
DS1501YZN+

DS1501YZN+

IC RTC CLK/CALENDAR PAR 28SOIC

Analog Devices Inc./Maxim Integrated

199 -
RFQ
DS1501YZN+

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Active 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 Surface Mount - - 28-SOIC
DS17487-5IND+

DS17487-5IND+

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

153 -
RFQ
DS17487-5IND+

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 4KB HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 4.5V ~ 5.5V -40°C ~ 85°C Through Hole - - 24-EDIP
DS1744W-120+

DS1744W-120+

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

302 -
RFQ
DS1744W-120+

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1554W-120IND+

DS1554W-120IND+

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

186 -
RFQ
DS1554W-120IND+

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 4mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1556WP-120IND+

DS1556WP-120IND+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

499 -
RFQ
DS1556WP-120IND+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 4mA @ 3.3V -40°C ~ 85°C Surface Mount - - 34-PowerCap Module
DS1744P-70IND+

DS1744P-70IND+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

140 -
RFQ
DS1744P-70IND+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 4mA @ 5V -40°C ~ 85°C Surface Mount - - 34-PowerCap Module
DS1744WP-120IND+

DS1744WP-120IND+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

185 -
RFQ
DS1744WP-120IND+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 2mA @ 3.3V -40°C ~ 85°C Surface Mount - - 34-PowerCap Module
DS1747WP-120IND+

DS1747WP-120IND+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

68 -
RFQ
DS1747WP-120IND+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 2mA @ 3.3V -40°C ~ 85°C Surface Mount - - 34-PowerCap Module
DS1747P-70IND+

DS1747P-70IND+

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

30 -
RFQ
DS1747P-70IND+

Datasheet

- 34-PowerCap™ Module Tray Active Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 4mA @ 5V -40°C ~ 85°C Surface Mount - - 34-PowerCap Module
MCP79401-I/ST

MCP79401-I/ST

IC RTC CLK/CALENDAR I2C 8TSSOP

Microchip Technology

370 -
RFQ
MCP79401-I/ST

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Unique ID 64B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 5.5V 1.2µA (Typ) @ 3.3V -40°C ~ 85°C Surface Mount - - 8-TSSOP
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