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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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RX-4581NB:B3 ROHSIC RTC CLK/CALENDAR SPI 22SON |
0 | - |
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Datasheet |
RX-4581NB | 22-SMD, 20 Leads, Flat Leads | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, SRAM | 16B | HH:MM:SS (24 hr) | YY-MM-DD-dd | SPI | 1.6V ~ 5.5V | - | 0.8µA ~ 1.2µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 22-SON |
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RTC-4574SA:B ROHSIC RTC CLK/CALENDAR SER 14SOP |
0 | - |
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Datasheet |
RTC-4574SA | 14-SOIC (0.197", 5.00mm Width) | Bulk | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year | - | HH:MM:SS (24 hr) | YY-MM-DD-dd | 3-Wire Serial | 1.6V ~ 5.5V | - | 1µA ~ 2µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 14-SOP |
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RX-8025SA:AA:ROHSIC RTC CLK/CALENDAR I2C 14SOP |
0 | - |
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Datasheet |
RX-8025SA | 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 | 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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RTC-8564JE:ROHSIC RTC CLK/CALENDAR I2C 20VSOJ |
0 | - |
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Datasheet |
RTC-8564JE | 20-LSSOJ (0.213", 5.40mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Y2K | - | HH:MM:SS | YY-MM-DD-dd | I2C, 2-Wire Serial | 1.8V ~ 5.5V | - | 0.7µA ~ 0.8µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 20-VSOJ |
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RX-4581NB:B0 ROHSIC RTC CLK/CALENDAR SPI 22SON |
0 | - |
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Datasheet |
RX-4581NB | 22-SMD, 20 Leads, Flat Leads | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, SRAM | 16B | HH:MM:SS (24 hr) | YY-MM-DD-dd | SPI | 1.6V ~ 5.5V | - | 0.8µA ~ 1.2µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 22-SON |
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RX-4581NB:B ROHSIC RTC CLK/CALENDAR SPI 22SON |
0 | - |
|
Datasheet |
RX-4581NB | 22-SMD, 20 Leads, Flat Leads | Bulk | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, SRAM | 16B | HH:MM:SS (24 hr) | YY-MM-DD-dd | SPI | 1.6V ~ 5.5V | - | 0.8µA ~ 1.2µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 22-SON |
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ISL12032IVZ-TIC RTC EVENT REC I2C 14TSSOP |
0 | - |
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Datasheet |
- | 14-TSSOP (0.173", 4.40mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Time Event Recorder | Alarm, SRAM, Trickle-Charger | 128B | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 18µA @ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 14-TSSOP |
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BQ3285P-SB2E3IC RTC CLK/CALENDAR PAR 24DIP |
0 | - |
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Datasheet |
- | 24-DIP (0.600", 15.24mm) | Tube | Obsolete | 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 | Through Hole | - | - | 24-PDIP |
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BQ4285S-SB2G4IC RTC CLK/CALENDAR PAR 24SOIC |
0 | - |
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Datasheet |
- | 24-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | 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 |
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BQ4845S-A4G4IC 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, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Parallel | 4.75V ~ 5.5V | 2.3V ~ 4V | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | 0°C ~ 70°C | Surface Mount | - | - | 28-SOIC |
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BQ4845S-A4NG4IC RTC CLK/CALENDAR PAR 28SOIC |
0 | - |
|
Datasheet |
- | 28-SOIC (0.295", 7.50mm Width) | 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 | 4.75V ~ 5.5V | 2.3V ~ 4V | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | -40°C ~ 85°C | Surface Mount | - | - | 28-SOIC |
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BQ4845YS-A4G4IC 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, 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 | Surface Mount | - | - | 28-SOIC |
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PCA2125TS/1,112IC RTC CLK/CALENDAR SPI 14TSSOP |
0 | - |
|
Datasheet |
- | 14-TSSOP (0.173", 4.40mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output, Watchdog Timer | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | SPI | 1.6V ~ 5.5V | - | 1.8µA @ 2V ~ 5V | -40°C ~ 125°C | Surface Mount | - | - | 14-TSSOP |
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PCA2125TS/1,118IC RTC CLK/CALENDAR SPI 14TSSOP |
0 | - |
|
Datasheet |
- | 14-TSSOP (0.173", 4.40mm Width) | Tape & Reel (TR) | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Square Wave Output, Watchdog Timer | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | SPI | 1.6V ~ 5.5V | - | 1.8µA @ 2V ~ 5V | -40°C ~ 125°C | Surface Mount | - | - | 14-TSSOP |
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X1288V14ZIC RTC CLK/CALENDAR I2C 14TSSOP |
0 | - |
|
Datasheet |
- | 14-TSSOP (0.173", 4.40mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Supervisor, Watchdog Timer | - | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 4.5V ~ 5.5V | 1.8V ~ 5.5V | 10µA ~ 20µA @ 2.7V ~ 5V | 0°C ~ 70°C | Surface Mount | - | - | 14-TSSOP |
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X1288V14Z-2.7IC RTC CLK/CALENDAR I2C 14TSSOP |
0 | - |
|
Datasheet |
- | 14-TSSOP (0.173", 4.40mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Supervisor, Watchdog Timer | - | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 10µA ~ 20µA @ 2.7V ~ 5V | 0°C ~ 70°C | Surface Mount | - | - | 14-TSSOP |
|
X1288V14Z-4.5AIC RTC CLK/CALENDAR I2C 14TSSOP |
0 | - |
|
Datasheet |
- | 14-TSSOP (0.173", 4.40mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Supervisor, Watchdog Timer | - | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 4.5V ~ 5.5V | 1.8V ~ 5.5V | 10µA ~ 20µA @ 2.7V ~ 5V | 0°C ~ 70°C | Surface Mount | - | - | 14-TSSOP |
|
ISL1208IB8ZR5291IC RTC CLK/CALENDAR I2C 8SOIC |
0 | - |
|
Datasheet |
- | 8-SOIC (0.154", 3.90mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, SRAM | 2B | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 4µA ~ 6µA @ 3V ~ 5V | -40°C ~ 85°C | Surface Mount | - | - | 8-SOIC |
|
CDP68HC68T1MZIC RTC CLK/CALENDAR SPI 20SOIC |
0 | - |
|
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 |
|
|
ISL12025IVZIC RTC CLK/CALENDAR I2C 8TSSOP |
0 | - |
|
Datasheet |
- | 8-TSSOP (0.173", 4.40mm Width) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, Supervisor, Unique ID, Watchdog Timer | - | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | I2C, 2-Wire Serial | 2.7V ~ 5.5V | 1.8V ~ 5.5V | 10µA ~ 20µA @ 2.7V ~ 5.5V | -40°C ~ 85°C | Surface Mount | - | - | 8-TSSOP |

