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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RA8900CE UB3IC RTC CLK/CALENDAR I2C 10SMD |
0 | - |
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Datasheet |
- | 10-SMD, No Lead | Tape & Reel (TR) | Active | Not Verified | Clock/Calendar | Alarm | - | HH:MM:SS | YY-MM-DD-dd | I2C | 2.5V ~ 5.5V | - | 1.4µA ~ 1.5µA @ 3V ~ 5V | -40°C ~ 85°C (TA) | Surface Mount | Automotive | AEC-Q200 | 10-SMD |
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RA8804CE XB3IC RTC CLK/CALENDAR I2C 10SMD |
0 | - |
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Datasheet |
- | 10-SMD, No Lead | Tape & Reel (TR) | Active | Not Verified | Clock/Calendar | Alarm | - | HH:MM:SS | YY-MM-DD-dd | I2C | 1.6V ~ 5.5V | - | 1.5µA ~ 1.6µA @ 3V ~ 5V | -40°C ~ 105°C (TA) | Surface Mount | Automotive | AEC-Q200 | 10-SMD |
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PT7C4311AZEEXIC RTC CLK/CALENDAR I2C 8TDFN |
0 | - |
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- |
- | 8-WFDFN Exposed Pad | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Square Wave Output | 56B | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 1.2V ~ 5.5V | 2V ~ 3.5V | 150µA @ 1.5V ~ 5.5V | -40°C ~ 85°C (TA) | Surface Mount | - | - | 8-TDFN (2x3) |
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PT7C4307AZEEXIC RTC CLK/CALENDAR I2C 8TDFN |
0 | - |
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- |
- | 8-WFDFN Exposed Pad | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Square Wave Output | 56B | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 4.5V ~ 5.5V | 2V ~ 3.5V | 1.5mA @ 4.5V ~ 5.5V | -40°C ~ 85°C (TA) | Surface Mount | - | - | 8-TDFN (2x3) |
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1339BC-31SRGIIC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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- |
- | 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, Serial | 3.3V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.63V ~ 5.5V | -40°C ~ 85°C (TA) | Surface Mount | - | - | 16-SOIC |
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1339AC-31CSRGIIC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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- |
- | 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, Serial | 3.3V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.63V ~ 5.5V | -40°C ~ 85°C (TA) | Surface Mount | - | - | 16-SOIC |
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1339AC-31CSRGI8IC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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- |
- | 16-SOIC (0.295", 7.50mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output, Trickle-Charger | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, Serial | 3.3V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.63V ~ 5.5V | -40°C ~ 85°C (TA) | Surface Mount | - | - | 16-SOIC |
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1339BC-31SRGI8IC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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- |
- | 16-SOIC (0.295", 7.50mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output, Trickle-Charger | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, Serial | 3.3V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.63V ~ 5.5V | -40°C ~ 85°C (TA) | Surface Mount | - | - | 16-SOIC |
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1337BCSRGIIC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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- |
- | 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 | 1.8V ~ 5.5V | - | - | -40°C ~ 85°C | Surface Mount | - | - | 16-SOIC |
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1337BCSRGI8IC RTC CLK/CALENDAR I2C 16SOIC |
0 | - |
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- |
- | 16-SOIC (0.295", 7.50mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C | 1.8V ~ 5.5V | - | - | -40°C ~ 85°C | Surface Mount | - | - | 16-SOIC |
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RV-3129-C3-32.768KHZ-OPTION-B-TA-QAIC RTC CLK/CALENDAR I2C 10SON |
0 | - |
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Datasheet |
C3 | 10-VCDFN | Bulk | Active | Not Verified | Clock/Calendar | Alarm, EEPROM, RAM, Trickle Charger | 2B, 8B | HH:MM:SS | YY-MM-DD-dd | I2C, 2-Wire Serial | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | 1µA @ 3V | -40°C ~ 85°C | Surface Mount | - | - | 10-SON (3.7x2.5) |
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RV-3129-C3-32.768KHZ-OPTION-B-TB-QCIC RTC CLK/CALENDAR I2C 10SON |
0 | - |
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Datasheet |
C3 | 10-VCDFN | Bulk | Active | Not Verified | Clock/Calendar | Alarm, EEPROM, RAM, Trickle Charger | 2B, 8B | HH:MM:SS | YY-MM-DD-dd | I2C, 2-Wire Serial | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | 1µA @ 3V | -40°C ~ 125°C | Surface Mount | - | - | 10-SON (3.7x2.5) |
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RV-3149-C3-32.768KHZ-OPTION-B-TA-QAIC RTC CLK/CALENDAR SPI 10SON |
0 | - |
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Datasheet |
C3 | 10-VCDFN | Bulk | Active | Not Verified | Clock/Calendar | Alarm, EEPROM, RAM, Trickle Charger | 2B, 8B | HH:MM:SS | YY-MM-DD-dd | SPI, 4-Wire Serial | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | 1µA @ 3V | -40°C ~ 85°C | Surface Mount | - | - | 10-SON (3.7x2.5) |
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RV-3149-C3-32.768KHZ-OPTION-A-TB-QCIC RTC CLK/CALENDAR SPI 10SON |
0 | - |
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Datasheet |
C3 | 10-VCDFN | Bulk | Active | Not Verified | Clock/Calendar | Alarm, EEPROM, RAM, Trickle Charger | 2B, 8B | HH:MM:SS | YY-MM-DD-dd | SPI, 4-Wire Serial | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | 1µA @ 3V | -40°C ~ 125°C | Surface Mount | - | - | 10-SON (3.7x2.5) |
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RV-3129-C3-32.768KHZ-OPTION-A-TB-QCIC RTC CLK/CALENDAR I2C 10SON |
0 | - |
|
Datasheet |
C3 | 10-VCDFN | Bulk | Active | Not Verified | Clock/Calendar | Alarm, EEPROM, RAM, Trickle Charger | 2B, 8B | HH:MM:SS | YY-MM-DD-dd | I2C, 2-Wire Serial | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | 1µA @ 3V | -40°C ~ 125°C | Surface Mount | - | - | 10-SON (3.7x2.5) |
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RV-3149-C3-32.768KHZ-OPTION-B-TB-QCIC RTC CLK/CALENDAR SPI 10SON |
0 | - |
|
Datasheet |
C3 | 10-VCDFN | Bulk | Active | Not Verified | Clock/Calendar | Alarm, EEPROM, RAM, Trickle Charger | 2B, 8B | HH:MM:SS | YY-MM-DD-dd | SPI, 4-Wire Serial | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | 1µA @ 3V | -40°C ~ 125°C | Surface Mount | - | - | 10-SON (3.7x2.5) |
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RX-4574LCB PURE SNRX-4574LC:B RTC {SN-AG OR SN} 5+ |
0 | - |
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Datasheet |
RX-4574LC | 12-TFSOJ (0.094", 2.40mm Width) | Bulk | Obsolete | - | Clock/Calendar | Alarm | - | HH:MM:SS | YY-MM-DD | 3-Wire Serial | 1.6V ~ 5.5V | 1.3V ~ 5.5V | 700nA ~ 900nA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 12-VSOJ |
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RS5C316B-E2-FBWIRE INTERFACE REAL-TIME CLOCK |
0 | - |
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- |
- | 8-LSSOP (0.173", 4.40mm Width) | Bulk | Obsolete | - | Clock/Calendar | Alarm, Leap Year | - | HH:MM:SS (12/24 hr) | YY-MM-DD | Parallel, Serial | 2.5V ~ 6V | - | 1.5µA ~ 2µA @ 3V ~ 6V | -40°C ~ 85°C | Surface Mount | - | - | 8-SSOP |
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RV5C348A-E2-FBWIRE INTERFACE REAL-TIME CLOCK |
0 | - |
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- |
- | - | Bulk | Obsolete | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
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RS5C338A-E2-FBWIRE INTERFACE REAL-TIME CLOCK |
0 | - |
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- |
- | 10-LFSOP (0.173", 4.40mm Width) | Bulk | Obsolete | - | Clock/Calendar | Alarm, Leap Year | 8B | HH:MM:SS (12/24 hr) | YY-MM-DD | 3-Wire Serial | 2V ~ 5.5V | - | 0.8µA @ 3V | -40°C ~ 85°C | Surface Mount | - | - | 10-SSOP |

