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
DS1339BU+T

DS1339BU+T

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

1,530 -
RFQ
DS1339BU+T

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.71V ~ 5.5V 1.3V ~ 3.7V 200µA @ 1.71V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
DS1308U-33+

DS1308U-33+

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

1,469 -
RFQ
DS1308U-33+

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3V ~ 5.5V 1.3V ~ 5.5V 125µA ~ 200µA @ 3V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
DS1339U-2+

DS1339U-2+

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

1,540 -
RFQ
DS1339U-2+

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V 1.3V ~ 3.7V 100µA @ 2.2V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
DS1340Z-3+

DS1340Z-3+

IC RTC CLK/CALENDAR I2C 8SOIC

Analog Devices Inc./Maxim Integrated

5,672 -
RFQ
DS1340Z-3+

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube Active Not Verified Clock/Calendar Leap Year, Trickle-Charger - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.3V ~ 3.7V 125µA @ 3.3V -40°C ~ 85°C Surface Mount - - 8-SOIC
DS1338U-33+

DS1338U-33+

IC RTC CLOCK/CALENDAR I2C 8UMAX

Analog Devices Inc./Maxim Integrated

22 -
RFQ
DS1338U-33+

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3V ~ 5.5V 1.3V ~ 3.7V 125µA ~ 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-uMAX/uSOP
DS1340C-33#T&R

DS1340C-33#T&R

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

3,821 -
RFQ
DS1340C-33#T&R

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Leap Year, Trickle-Charger - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.97V ~ 5.5V 1.3V ~ 5.5V 150µA @ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1390U-3+

DS1390U-3+

IC RTC CLK/CALENDAR SPI 10UMAX

Analog Devices Inc./Maxim Integrated

1,565 -
RFQ
DS1390U-3+

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 SPI 2.7V ~ 3.3V 1.3V ~ 3.7V 125µA @ 2.7V ~ 3.3V -40°C ~ 85°C Surface Mount - - 10-uMAX/uSOP
DS1318E+

DS1318E+

IC RTC ELAPSED CNT PAR 24TSSOP

Analog Devices Inc./Maxim Integrated

312 -
RFQ
DS1318E+

Datasheet

- 24-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Elapsed Time Counter Alarm, Square Wave Output - Binary Binary Parallel 3V ~ 3.6V 1.6V ~ 3.7V 150µA @ 3V ~ 3.6V -40°C ~ 85°C Surface Mount - - 24-TSSOP
DS1340Z-18+

DS1340Z-18+

IC RTC CLK/CALENDAR I2C 8SOIC

Analog Devices Inc./Maxim Integrated

2,679 -
RFQ
DS1340Z-18+

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube Active Not Verified Clock/Calendar Leap Year, Trickle-Charger - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.71V ~ 5.5V 1.3V ~ 3.7V 100µA @ 1.89V -40°C ~ 85°C Surface Mount - - 8-SOIC
DS1344E-33+

DS1344E-33+

IC RTC CLK/CALENDAR SPI 20TSSOP

Analog Devices Inc./Maxim Integrated

223 -
RFQ
DS1344E-33+

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 3V ~ 5.5V 1.3V ~ 5.5V 120µA ~ 160µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 20-TSSOP
DS1343E-33+

DS1343E-33+

IC RTC CLK/CALENDAR SPI 20TSSOP

Analog Devices Inc./Maxim Integrated

165 -
RFQ
DS1343E-33+

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 3V ~ 5.5V 1.3V ~ 5.5V 120µA ~ 160µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 20-TSSOP
DS1337C#T&R

DS1337C#T&R

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

2,130 -
RFQ
DS1337C#T&R

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.6µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1337C#

DS1337C#

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

263 -
RFQ
DS1337C#

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.6µA @ 1.3V ~ 1.8V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1306E+

DS1306E+

IC RTC CLK/CALENDAR SPI 20TSSOP

Analog Devices Inc./Maxim Integrated

316 -
RFQ
DS1306E+

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2V ~ 5.5V 2V ~ 5.5V 25.3µA ~ 81µA @ 2V ~ 5V 0°C ~ 70°C Surface Mount - - 20-TSSOP
M41ST85WMH6F

M41ST85WMH6F

IC RTC CLK/CALENDAR I2C 28SOH

STMicroelectronics

1,434 -
RFQ
M41ST85WMH6F

Datasheet

- 28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer 44B HH:MM:SS:hh (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 3.6V 2.5V ~ 3.5V 0.5mA @ 2.7V ~ 3.6V -40°C ~ 85°C Surface Mount - - 28-SOH
BQ3285S-SB2

BQ3285S-SB2

IC RTC CLK/CALENDAR PAR 24SOIC

Texas Instruments

391 -
RFQ
BQ3285S-SB2

Datasheet

- 24-SOIC (0.295", 7.50mm Width) Bulk 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 - 0°C ~ 70°C Surface Mount - - 24-SOIC
DS1338C-33#T&R

DS1338C-33#T&R

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

2,752 -
RFQ
DS1338C-33#T&R

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3V ~ 5.5V 1.3V ~ 3.7V 125µA ~ 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1338C-33#

DS1338C-33#

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

1,100 -
RFQ
DS1338C-33#

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Clock/Calendar Leap Year, NVSRAM, Square Wave Output 56B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 3V ~ 5.5V 1.3V ~ 3.7V 125µA ~ 200µA @ 3.63V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
DS1340C-33#

DS1340C-33#

IC RTC CLK/CALENDAR I2C 16SOIC

Analog Devices Inc./Maxim Integrated

270 -
RFQ
DS1340C-33#

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tube Active Not Verified Clock/Calendar Leap Year, Trickle-Charger - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.97V ~ 5.5V 1.3V ~ 5.5V 150µA @ 5.5V -40°C ~ 85°C Surface Mount - - 16-SOIC
RX8900SA:UA3 PURE SN

RX8900SA:UA3 PURE SN

IC RTC CLK/CALENDAR I2C 14SOP

EPSON

1,401 -
RFQ
RX8900SA:UA3 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
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