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
DS1747P-70

DS1747P-70

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1747P-70 Datasheet - 34-PowerCap™ Module Tube Obsolete 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 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1315SN-5

DS1315SN-5

IC RTC PHANTOM CHIP PAR 16SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1315SN-5 Datasheet - 16-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Phantom Time Chip Leap Year - HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 1.3mA @ 5V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1248WP-120

DS1248WP-120

IC RTC PHANTOM CHIP PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1248WP-120 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Phantom Time Chip NVSRAM 128KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 7mA @ 3.3V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1646-120

DS1646-120

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1646-120 Datasheet - 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 4mA @ 4.5 V ~ 5.5 V 0°C ~ 70°C Through Hole - - 32-EDIP
CDP68HC68T1EZ

CDP68HC68T1EZ

IC RTC CLK/CALENDAR SPI 16DIP

Renesas Electronics Corporation

1,427 -
RFQ
CDP68HC68T1EZ Datasheet - 16-DIP (0.300", 7.62mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Watchdog Timer 32B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 3V ~ 6V 2.2V ~ 6V 20µA ~ 500µA @ 5V -40°C ~ 85°C Through Hole - - 16-PDIP
DS1251WP-120

DS1251WP-120

IC RTC PHANTOM CHIP PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1251WP-120 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 7mA @ 3.3V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1251YP-70

DS1251YP-70

IC RTC PHANTOM CHIP PAR 34PCM

Analog Devices Inc./Maxim Integrated

320 -
RFQ
DS1251YP-70 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 3V 10mA @ 5V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
DS1644L-120

DS1644L-120

DS1644 NV TIMEKEEPING RAM

Analog Devices Inc./Maxim Integrated

769 -
RFQ
DS1644L-120 Datasheet - 28-DIP Module (0.600", 15.24mm) Bulk Active Not Verified Clock/Calendar EEPROM, Leap Year, NVSRAM, RAM 32KB HH:MM:SS (24 hr) YY-MM-DD - 4.5V ~ 5.5V - 4mA @ 5V 0°C ~ 70°C Through Hole - - 28-EDIP
BQ4832YMA-85

BQ4832YMA-85

IC RTC CLK/CALENDAR PAR 32DIP

Texas Instruments

0 -
RFQ
BQ4832YMA-85 Datasheet - 32-DIP Module (0.610", 15.49mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Supervisor, Watchdog Timer - HH:MM:SS:hh (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 4.5 V ~ 5.5 V 0°C ~ 70°C Through Hole - - 32-DIP Module (18.42x42.8)
BQ4852YMC-85

BQ4852YMC-85

IC RTC CLK/CALENDAR PAR 36DIP

Benchmarq

1,000 -
RFQ
BQ4852YMC-85 Datasheet - 36-DIP Module (0.610", 15.49mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Supervisor, Watchdog Timer - HH:MM:SS:hh (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 1mA @ 4.5V ~ 5.5V 0°C ~ 70°C Through Hole - - 36-DIP Module (18.42x52.96)
BQ4852YMC-85

BQ4852YMC-85

IC RTC CLK/CALENDAR PAR 36DIP

Texas Instruments

0 -
RFQ
BQ4852YMC-85 Datasheet - 36-DIP Module (0.610", 15.49mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Supervisor, Watchdog Timer - HH:MM:SS:hh (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 1mA @ 4.5V ~ 5.5V 0°C ~ 70°C Through Hole - - 36-DIP Module
DS1557WP-120IND

DS1557WP-120IND

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1557WP-120IND Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 512KB 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
DS1557WP-120

DS1557WP-120

IC RTC CLK/CALENDAR PAR 34PCM

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1557WP-120 Datasheet - 34-PowerCap™ Module Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V 3V 4mA @ 3.3V 0°C ~ 70°C Surface Mount - - 34-PowerCap Module
BQ4850YMA-85N

BQ4850YMA-85N

IC RTC CLK/CALENDAR PAR 32DIP

Texas Instruments

0 -
RFQ
BQ4850YMA-85N Datasheet - 32-DIP Module (0.61", 15.49mm) Tube Obsolete Not Verified Clock/Calendar Alarm - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 1mA @ 4.5V ~ 5.5V -40°C ~ 85°C Through Hole - - 32-DIP Module (18.42x52.96)
DS1670S+

DS1670S+

IC RTC SYST CTRLR SER 20SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1670S+ Datasheet - 20-SOIC (0.295", 7.50mm Width) Tube Obsolete 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-SOIC
DS1673S-5+

DS1673S-5+

IC RTC SYST CTRLR SER 20SOIC

Analog Devices Inc./Maxim Integrated

0 -
RFQ
DS1673S-5+ Datasheet - 20-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Portable System Controller Alarm, Leap Year, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 4.5V ~ 5.5V 2.5V ~ 3.7V 300µA @ 5V 0°C ~ 70°C Surface Mount - - 20-SOIC
ISL12024IRTCZ

ISL12024IRTCZ

REAL-TIME CLOCK/CALENDAR WITH EM

Intersil

656 -
RFQ
ISL12024IRTCZ Datasheet - 8-WDFN Exposed Pad Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, Unique ID - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TDFN (3x3)
ISL12024IRTCZ

ISL12024IRTCZ

REAL-TIME CLOCK/CALENDAR WITH EM

Renesas Electronics Corporation

190 -
RFQ
ISL12024IRTCZ Datasheet - 8-WDFN Exposed Pad Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, Unique ID - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TDFN (3x3)
HC8825K

HC8825K

compatible with 8025T Built-in c

Suzhou Hangjing Elec&Tech Co.,Ltd

79,123 -
RFQ
HC8825K 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 - 1.2µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
STK17TA8-RF35

STK17TA8-RF35

REAL TIME CLOCK, CMOS, PDSO48

Simtek

280 -
RFQ
STK17TA8-RF35 Datasheet * - Bulk Active Not Verified - - - - - - - - - - - - - -
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