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
RTC-72423A: PURE SN

RTC-72423A: PURE SN

IC RTC CLK/CALENDAR PAR 24SOP

EPSON

0 -
RFQ
RTC-72423A: PURE SN

Datasheet

RTC-72423 24-SOIC (0.311", 7.90mm Width) Bulk Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (12/24 hr) - Parallel 4.5V ~ 5.5V - 5µA ~ 10µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 24-SOP
RTC-72423B: PURE SN

RTC-72423B: PURE SN

IC RTC CLK/CALENDAR PAR 24SOP

EPSON

0 -
RFQ
RTC-72423B: PURE SN

Datasheet

RTC-72423 24-SOIC (0.311", 7.90mm Width) Bulk Obsolete Not Verified Clock/Calendar Leap Year - HH:MM:SS (12/24 hr) - Parallel 4.5V ~ 5.5V - 5µA ~ 10µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 24-SOP
RTC-7301SF:B ROHS

RTC-7301SF:B ROHS

IC RTC CLK/CALENDAR PAR 24SSOP

EPSON

0 -
RFQ
RTC-7301SF:B ROHS

Datasheet

- 24-SOP (0.213", 5.40mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm - - - Parallel 2.4V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 24-SSOP
RTC-7301SF:B0 ROHS

RTC-7301SF:B0 ROHS

IC RTC CLK/CALENDAR PAR 24SSOP

EPSON

0 -
RFQ
RTC-7301SF:B0 ROHS

Datasheet

- 24-SOP (0.213", 5.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm - - - Parallel 2.4V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 24-SSOP
RX-4045SA:AA

RX-4045SA:AA

IC RTC CLK/CALENDAR SPI 14SOP

EPSON

0 -
RFQ
RX-4045SA:AA

Datasheet

RX-4045SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 1.7V ~ 5.5V - 1.2µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-4571LC:B PURE SN

RX-4571LC:B PURE SN

IC RTC CLK/CALENDAR SER 12VSOJ

EPSON

0 -
RFQ
RX-4571LC:B PURE SN

Datasheet

RX-4571LC 12-TFSOJ (0.094", 2.40mm Width) Strip Active Not Verified Clock/Calendar Alarm, Leap Year - - - 3-Wire Serial 1.6V ~ 5.5V - 0.95µA ~ 1µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-4574LC:B PURE SN

RX-4574LC:B PURE SN

IC RTC CLK/CALENDAR SER 12VSOJ

EPSON

0 -
RFQ
RX-4574LC:B PURE SN

Datasheet

RX-4574LC 12-TFSOJ (0.094", 2.40mm Width) Strip Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - 0.7µA ~ 0.9µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-4575LC:B

RX-4575LC:B

IC RTC CLK/CALENDAR SER 12VSOJ

EPSON

0 -
RFQ
RX-4575LC:B

Datasheet

RX-4575LC 12-TFSOJ (0.094", 2.40mm Width) Strip Obsolete Not Verified Clock/Calendar Alarm - - - 3-Wire Serial 1.6V ~ 5.5V - 0.7µA ~ 0.9µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-4801SA:UB PURE SN

RX-4801SA:UB PURE SN

IC RTC CLK/CALENDAR SER 14SOP

EPSON

0 -
RFQ
RX-4801SA:UB PURE SN

Datasheet

RX-4801SA 14-SOIC (0.197", 5.00mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm - - - 4-Wire Serial 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-8581JE:B I2C-BUS

RX-8581JE:B I2C-BUS

IC RTC CLK/CALENDAR I2C 20VSOJ

EPSON

0 -
RFQ
RX-8581JE:B I2C-BUS

Datasheet

RX-8581JE 20-LSSOJ (0.213", 5.40mm Width) Strip Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
RX-8581NB:B  I2C-BUS

RX-8581NB:B I2C-BUS

IC RTC CLK/CALENDAR I2C 22SON

EPSON

0 -
RFQ
RX-8581NB:B  I2C-BUS

Datasheet

RX-8581NB 22-LFDFN Strip Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 22-SON (6.3x4.8)
RX-8581NB:B PURE SN

RX-8581NB:B PURE SN

IC RTC CLK/CALENDAR I2C 22SON

EPSON

0 -
RFQ
RX-8581NB:B PURE SN

Datasheet

RX-8581NB 22-LFDFN Strip Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 22-SON (6.3x4.8)
RX-8731LC:B

RX-8731LC:B

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8731LC:B

Datasheet

RX-8731LC 12-TFSOJ (0.094", 2.40mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Unique ID 80b HH:MM:SS (24 hr) YY-MM-DD-dd I2C 1.7V ~ 5.5V - 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8731LC:B PURE SN

RX-8731LC:B PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8731LC:B PURE SN

Datasheet

RX-8731LC 12-TFSOJ (0.094", 2.40mm Width) Bulk Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Unique ID 80b HH:MM:SS (24 hr) YY-MM-DD-dd I2C 1.7V ~ 5.5V - 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8731LC:B0 PURE SN

RX-8731LC:B0 PURE SN

IC RTC CLK/CALENDAR I2C 12VSOJ

EPSON

0 -
RFQ
RX-8731LC:B0 PURE SN

Datasheet

RX-8731LC 12-TFSOJ (0.094", 2.40mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Unique ID 80b HH:MM:SS (24 hr) YY-MM-DD-dd I2C 1.7V ~ 5.5V - 1.4µA ~ 1.5µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 12-VSOJ
RX-8801SA: UA PURE SN

RX-8801SA: UA PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8801SA: UA PURE SN

Datasheet

RX-8801SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
RX-8801SA: UB PURE SN

RX-8801SA: UB PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

0 -
RFQ
RX-8801SA: UB PURE SN

Datasheet

RX-8801SA 14-SOIC (0.197", 5.00mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm - - - I2C 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
MCP7940NT-E/SNVAO

MCP7940NT-E/SNVAO

IC RTC CLK/CALENDAR I2C 8SOIC

Microchip Technology

0 -
RFQ
MCP7940NT-E/SNVAO

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM 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 @ 3.3V -40°C ~ 125°C Surface Mount Automotive AEC-Q100 8-SOIC
MAX31342EWA+

MAX31342EWA+

IC RTC CLK/CALENDAR I2C 8WLP

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

- 8-WFBGA, WLBGA Strip Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 1.6V ~ 3.6V - 0.33µA @ 3V -40°C ~ 85°C Surface Mount - - 8-WLP (.97x1.97)
DS1747WP-C2+

DS1747WP-C2+

IC REAL TIME CLOCK

Analog Devices Inc./Maxim Integrated

0 -
RFQ

-

* - Bulk Obsolete Not Verified - - - - - - - - - - - - - -
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