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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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DS1501WSN/T&RIC RTC CLK/CALENDAR PAR 28SOIC |
0 | - |
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Datasheet |
- | 28-SOIC (0.295", 7.50mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | 256B | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 3V ~ 3.6V | 2.5V ~ 3.7V | 4mA @ 3V ~ 3.6V | -40°C ~ 85°C | Surface Mount | - | - | 28-SOIC |
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DS1315EN-33/T&RIC RTC PHANTOM CHIP PAR 20TSSOP |
0 | - |
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Datasheet |
- | 20-TSSOP (0.173", 4.40mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Phantom Time Chip | Leap Year | - | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 3V ~ 3.6V | 2.5V ~ 3.7V | 1.1mA @ 3.3V | -40°C ~ 85°C | Surface Mount | - | - | 20-TSSOP |
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DS1511YIC RTC CLK/CALENDAR PAR 28EDIP |
0 | - |
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Datasheet |
- | 28-DIP Module (0.600", 15.24mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | 256B | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | 2.5V ~ 3.7V | 5mA @ 4.5V ~ 5.5V | 0°C ~ 70°C | Through Hole | - | - | 28-EDIP |
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DS1687-3IC RTC CLK/CALENDAR PAR 24EDIP |
0 | - |
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Datasheet |
- | 24-DIP Module (0.600", 15.24mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, NVSRAM, Square Wave Output, Y2K | 242B | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Parallel | 2.7V ~ 3.7V | 2.5V ~ 3.7V | 2mA @ 3V | 0°C ~ 70°C | Through Hole | - | - | 24-EDIP |
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DS1501WSNIC RTC CLK/CALENDAR PAR 28SOIC |
0 | - |
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Datasheet |
- | 28-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | 256B | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 3V ~ 3.6V | 2.5V ~ 3.7V | 4mA @ 3V ~ 3.6V | -40°C ~ 85°C | Surface Mount | - | - | 28-SOIC |
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DS1670SIC RTC SYST CTRLR SER 20SOIC |
0 | - |
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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 |
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RX-8581SA:BIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
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Datasheet |
RX-8581SA | 14-SOIC (0.197", 5.00mm Width) | Tube | 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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RTC-62421BIC RTC CLK/CALENDAR PAR 18DIP |
0 | - |
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Datasheet |
- | 18-DIP (0.300", 7.62mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Leap Year | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | - | 1.8µA ~ 3µA @ 2V ~ 5V | -40°C ~ 85°C | Through Hole | - | - | 18-DIP |
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M41ST84YMQ6EIC RTC CLOCK/CALENDAR I2C 16SO |
0 | - |
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Datasheet |
- | 16-SOIC (0.154", 3.90mm Width) | Tube | Obsolete | 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 | 4.5V ~ 5.5V | 2.5V ~ 3.5V | 1mA @ 4.5V ~ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 16-SO |
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M41ST85YMH6EIC RTC CLK/CALENDAR I2C 28SOH |
0 | - |
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Datasheet |
- | 28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets | Tube | Obsolete | 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 | 4.5V ~ 5.5V | 2.5V ~ 3.5V | 1mA @ 4.5V ~ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 28-SOH |
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M41ST85YMX6IC RTC CLOCK/CALENDAR I2C 28SO |
0 | - |
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Datasheet |
- | 28-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | 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 | 4.5V ~ 5.5V | 2.5V ~ 3.5V | 1mA @ 4.5V ~ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 28-SO |
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CDP68HC68T1EIC RTC CLK/CALENDAR SPI 16DIP |
0 | - |
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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 |
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CDP68HC68T1MIC RTC CLK/CALENDAR SPI 20SOIC |
0 | - |
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Datasheet |
- | 20-SOIC (0.295", 7.50mm Width) | 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 | Surface Mount | - | - | 20-SOIC |
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CDP68HC68T1M2IC RTC CLK/CALENDAR SPI 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, 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 | Surface Mount | - | - | 16-SOIC |
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DS1248Y-70INDIC RTC PHANTOM CHIP PAR 32EDIP |
0 | - |
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Datasheet |
- | 32-DIP Module (0.600", 15.24mm) | Tube | Obsolete | Not Verified | Phantom Time Chip | NVSRAM | 128KB | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | - | 10mA @ 5V | -40°C ~ 85°C | Through Hole | - | - | 32-EDIP |
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DS1338U-18IC RTC CLOCK/CALENDAR I2C 8UMAX |
0 | - |
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Datasheet |
- | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | Tube | Obsolete | 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 | 1.71V ~ 5.5V | 1.3V ~ 3.7V | 100µA @ 1.89V | -40°C ~ 85°C | Surface Mount | - | - | 8-uMAX/uSOP |
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DS1338U-3IC RTC CLOCK/CALENDAR I2C 8UMAX |
0 | - |
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Datasheet |
- | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | Tube | Obsolete | 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 | 2.7V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.3V | -40°C ~ 85°C | Surface Mount | - | - | 8-uMAX/uSOP |
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DS1338Z-18IC RTC CLK/CALENDAR I2C 8SOIC |
0 | - |
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Datasheet |
- | 8-SOIC (0.154", 3.90mm Width) | Tube | Obsolete | 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 | 1.71V ~ 5.5V | 1.3V ~ 3.7V | 100µA @ 1.89V | -40°C ~ 85°C | Surface Mount | - | - | 8-SOIC |
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DS1338Z-3IC RTC CLK/CALENDAR I2C 8SOIC |
0 | - |
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Datasheet |
- | 8-SOIC (0.154", 3.90mm Width) | Tube | Obsolete | 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 | 2.7V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.3V | -40°C ~ 85°C | Surface Mount | - | - | 8-SOIC |
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DS1338Z-33IC RTC CLK/CALENDAR I2C 8SOIC |
0 | - |
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Datasheet |
- | 8-SOIC (0.154", 3.90mm Width) | Tube | Obsolete | 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-SOIC |

