Available 24/7 at
0755-82798135Real Time Clocks
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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BQ4845YP-A4IC RTC CLK/CALENDAR PAR 28DIP |
0 | - |
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Datasheet |
- | 28-DIP (0.600", 15.24mm) | Tube | Obsolete | 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 | 2.3V ~ 4V | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | 0°C ~ 70°C | Through Hole | - | - | 28-PDIP |
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BQ4845YP-A4E3IC RTC CLK/CALENDAR PAR 28DIP |
0 | - |
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Datasheet |
- | 28-DIP (0.600", 15.24mm) | Tube | Obsolete | 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 | 2.3V ~ 4V | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | 0°C ~ 70°C | Through Hole | - | - | 28-PDIP |
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RTC-4543SA:A0IC RTC CLK/CALENDAR SER 14SOP |
0 | - |
|
Datasheet |
- | 14-SOIC (0.197", 5.00mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Leap Year | - | HH:MM:SS (24 hr) | YY-MM-DD-dd | 3-Wire Serial | 2.5V ~ 5.5V | - | 1µA ~ 3µA @ 2V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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DS3231SIC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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Datasheet |
- | 16-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output, TCXO/Crystal | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 110µA ~ 170µA @ 3.63V ~ 5.5V | 0°C ~ 70°C | Surface Mount | - | - | 16-SOIC |
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DS3231S/T&RIC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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Datasheet |
- | 16-SOIC (0.295", 7.50mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output, TCXO/Crystal | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 110µA ~ 170µA @ 3.63V ~ 5.5V | 0°C ~ 70°C | Surface Mount | - | - | 16-SOIC |
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RTC-4543SA:A3 ROHSIC RTC CLK/CALENDAR SER 14SOP |
0 | - |
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Datasheet |
RTC-4543SA | 14-SOIC (0.197", 5.00mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | - | - | - | YY-MM-DD | 3-Wire Serial | 2.5V ~ 5.5V | - | 1µA ~ 3µA @ 2V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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RTC-4543SA:A0:PURE SNIC RTC CLK/CALENDAR SER 14SOP |
0 | - |
|
Datasheet |
RTC-4543SA | 14-SOIC (0.197", 5.00mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | - | - | - | - | 3-Wire Serial | 2.5V ~ 5.5V | - | 1µA ~ 3µA @ 2V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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DS1343D-33+IC RTC CLK/CALENDAR SPI 14TDFN |
0 | - |
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Datasheet |
- | 14-WFDFN Exposed Pad | 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 | - | - | 14-TDFN (3x3) |
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1337GCSRIIC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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Datasheet |
- | 16-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | 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 |
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DS1339C-33IC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
|
Datasheet |
- | 16-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | 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 | 2.97V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 16-SOIC |
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RX-8581SA:B3:ROHSIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
|
Datasheet |
RX-8581SA | 14-SOIC (0.197", 5.00mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year | - | HH:MM:SS (24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 1.8V ~ 5.5V | - | 0.8µA ~ 1.2µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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RX-8581SA:B3:PURE SNIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
|
Datasheet |
RX-8581SA | 14-SOIC (0.197", 5.00mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm | - | - | - | I2C | 1.8V ~ 5.5V | - | 0.8µA ~ 1.2µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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RX6110SA BX PURE SNIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
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Datasheet |
RX6110SA | 14-SOIC (0.197", 5.00mm Width) | Tape & Reel (TR) | Active | Not Verified | Clock/Calendar | Alarm, RAM | 16B | HH:MM:SS | YY-MM-DD | I2C, SPI | 1.6V ~ 5.5V | 1.1V ~ 5.5V | 2.1µA @ 3V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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DS1374C-18#IC RTC BINARY COUNTER I2C 16SOIC |
0 | - |
|
Datasheet |
- | 16-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | Not Verified | Binary Counter | Alarm, Square Wave Output, Trickle-Charger, Watchdog Timer | - | Binary | Binary | I2C, 2-Wire Serial | 1.71V ~ 1.89V | 1.3V ~ 3.7V | 100µA @ 1.71V ~ 1.89V | -40°C ~ 85°C | Surface Mount | - | - | 16-SOIC |
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RX-4803SA:UB PURE SNIC RTC CLK/CALENDAR SPI 14SOP |
0 | - |
|
Datasheet |
RX-4803SA | 14-SOIC (0.197", 5.00mm Width) | Tube | Active | Not Verified | Clock/Calendar | Alarm, Leap Year | - | HH:MM:SS (24 hr) | YY-MM-DD-dd | SPI | 1.6V ~ 5.5V | - | 2.1µA ~ 3.4µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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RX-8803SA:UB PURE SNIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
|
Datasheet |
RX-8803SA | 14-SOIC (0.197", 5.00mm Width) | Tube | 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 | - | - | 14-SOP |
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RX-8803SA:UC PURE SNIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
|
Datasheet |
RX-8803SA | 14-SOIC (0.197", 5.00mm Width) | Tube | 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 | - | - | 14-SOP |
|
M41T94MH6EIC RTC CLK/CALENDAR SPI 28SOH |
0 | - |
|
Datasheet |
- | 28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, NVRAM, Square Wave Output, Watchdog Timer | 44B | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | SPI | 2.7V ~ 5.5V | 2.5V ~ 3.5V | 1.4mA @ 2.7V ~ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 28-SOH |
|
RX-8025SA:AA PURE SNIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
|
Datasheet |
RX-8025SA | 14-SOIC (0.197", 5.00mm Width) | Tube | 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 |
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RX-8025SA:AC PURE SNIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
|
Datasheet |
RX-8025SA | 14-SOIC (0.197", 5.00mm Width) | Tube | 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 |

