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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
DS1251Y-1504096K NV SRAM & PHANTOM CLOCK |
213 | - |
|
Datasheet |
- | 32-DIP Module (0.600", 15.24mm) | Bulk | Active | Not Verified | Phantom Time Chip | EEPROM, Leap Year, NVSRAM, RAM | 512KB | HH:MM:SS:hh (12/24 hr) | YY-MM-DD | Parallel | 2.97V ~ 3.63V, 4.5V ~ 5.5V | Integrated | 10mA @ 5V | 0°C ~ 70°C (TA) | Through Hole | - | - | 32-EDIP |
|
|
DS1248W-120+IC RTC PHANTOM PAR 32-DIP |
770 | - |
|
Datasheet |
- | 32-DIP Module (0.600", 15.24mm) | Bulk | Obsolete | Not Verified | Phantom Time Chip | NVSRAM | 128KB | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 2.97V ~ 3.63V | - | 7mA @ 3.3V | 0°C ~ 70°C | Through Hole | - | - | 32-EDIP |
|
DS1747P-70IC RTC CLK/CALENDAR PAR 34PCM |
0 | - |
|
Datasheet |
- | 34-PowerCap™ Module | Tube | Obsolete | Not Verified | Clock/Calendar | Leap Year, NVSRAM, Y2K | 512KB | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | 3V | 4mA @ 5V | 0°C ~ 70°C | Surface Mount | - | - | 34-PowerCap Module |
|
DS1315SN-5IC RTC PHANTOM CHIP PAR 16SOIC |
0 | - |
|
Datasheet |
- | 16-SOIC (0.295", 7.50mm Width) | Tube | Obsolete | Not Verified | Phantom Time Chip | Leap Year | - | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | 2.5V ~ 3.7V | 1.3mA @ 5V | -40°C ~ 85°C | Surface Mount | - | - | 16-SOIC |
|
DS1248WP-120IC RTC PHANTOM CHIP PAR 34PCM |
0 | - |
|
Datasheet |
- | 34-PowerCap™ Module | Tube | Obsolete | Not Verified | Phantom Time Chip | NVSRAM | 128KB | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 2.97V ~ 3.63V | 3V | 7mA @ 3.3V | 0°C ~ 70°C | Surface Mount | - | - | 34-PowerCap Module |
|
|
DS1646-120IC RTC CLK/CALENDAR PAR 32EDIP |
0 | - |
|
Datasheet |
- | 32-DIP Module (0.600", 15.24mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Leap Year, NVSRAM | 128KB | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | 3V | 4mA @ 4.5 V ~ 5.5 V | 0°C ~ 70°C | Through Hole | - | - | 32-EDIP |
|
CDP68HC68T1EZIC RTC CLK/CALENDAR SPI 16DIP |
1,427 | - |
|
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 |
|
DS1251WP-120IC RTC PHANTOM CHIP PAR 34PCM |
0 | - |
|
Datasheet |
- | 34-PowerCap™ Module | Tube | Obsolete | Not Verified | Phantom Time Chip | Leap Year, NVSRAM | 512KB | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 2.97V ~ 3.63V | 3V | 7mA @ 3.3V | 0°C ~ 70°C | Surface Mount | - | - | 34-PowerCap Module |
|
DS1251YP-70IC RTC PHANTOM CHIP PAR 34PCM |
320 | - |
|
Datasheet |
- | 34-PowerCap™ Module | Tube | Obsolete | Not Verified | Phantom Time Chip | Leap Year, NVSRAM | 512KB | HH:MM:SS:hh (12/24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | 3V | 10mA @ 5V | 0°C ~ 70°C | Surface Mount | - | - | 34-PowerCap Module |
|
DS1644L-120DS1644 NV TIMEKEEPING RAM |
769 | - |
|
Datasheet |
- | 28-DIP Module (0.600", 15.24mm) | Bulk | Active | Not Verified | Clock/Calendar | EEPROM, Leap Year, NVSRAM, RAM | 32KB | HH:MM:SS (24 hr) | YY-MM-DD | - | 4.5V ~ 5.5V | - | 4mA @ 5V | 0°C ~ 70°C | Through Hole | - | - | 28-EDIP |
|
BQ4832YMA-85IC RTC CLK/CALENDAR PAR 32DIP |
0 | - |
|
Datasheet |
- | 32-DIP Module (0.610", 15.49mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Supervisor, Watchdog Timer | - | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | - | 4mA @ 4.5 V ~ 5.5 V | 0°C ~ 70°C | Through Hole | - | - | 32-DIP Module (18.42x42.8) |
|
BQ4852YMC-85IC RTC CLK/CALENDAR PAR 36DIP |
1,000 | - |
|
Datasheet |
- | 36-DIP Module (0.610", 15.49mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Supervisor, Watchdog Timer | - | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | - | 1mA @ 4.5V ~ 5.5V | 0°C ~ 70°C | Through Hole | - | - | 36-DIP Module (18.42x52.96) |
|
BQ4852YMC-85IC RTC CLK/CALENDAR PAR 36DIP |
0 | - |
|
Datasheet |
- | 36-DIP Module (0.610", 15.49mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Supervisor, Watchdog Timer | - | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | - | 1mA @ 4.5V ~ 5.5V | 0°C ~ 70°C | Through Hole | - | - | 36-DIP Module |
|
DS1557WP-120INDIC RTC CLK/CALENDAR PAR 34PCM |
0 | - |
|
Datasheet |
- | 34-PowerCap™ Module | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | 512KB | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 2.97V ~ 3.63V | 3V | 4mA @ 3.3V | -40°C ~ 85°C | Surface Mount | - | - | 34-PowerCap Module |
|
DS1557WP-120IC RTC CLK/CALENDAR PAR 34PCM |
0 | - |
|
Datasheet |
- | 34-PowerCap™ Module | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | 512KB | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 2.97V ~ 3.63V | 3V | 4mA @ 3.3V | 0°C ~ 70°C | Surface Mount | - | - | 34-PowerCap Module |
|
BQ4850YMA-85NIC RTC CLK/CALENDAR PAR 32DIP |
0 | - |
|
Datasheet |
- | 32-DIP Module (0.61", 15.49mm) | Tube | Obsolete | Not Verified | Clock/Calendar | Alarm | - | HH:MM:SS (24 hr) | YY-MM-DD-dd | Parallel | 4.5V ~ 5.5V | - | 1mA @ 4.5V ~ 5.5V | -40°C ~ 85°C | Through Hole | - | - | 32-DIP Module (18.42x52.96) |
|
DS1670S+IC RTC SYST CTRLR SER 20SOIC |
0 | - |
|
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 |
|
DS1673S-5+IC RTC SYST CTRLR SER 20SOIC |
0 | - |
|
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 | 4.5V ~ 5.5V | 2.5V ~ 3.7V | 300µA @ 5V | 0°C ~ 70°C | Surface Mount | - | - | 20-SOIC |
|
ISL12024IRTCZREAL-TIME CLOCK/CALENDAR WITH EM |
656 | - |
|
Datasheet |
- | 8-WDFN Exposed Pad | Bulk | Active | Not Verified | Clock/Calendar | Alarm, Leap Year, Unique ID | - | 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-TDFN (3x3) |
|
ISL12024IRTCZREAL-TIME CLOCK/CALENDAR WITH EM |
190 | - |
|
Datasheet |
- | 8-WDFN Exposed Pad | Bulk | Active | Not Verified | Clock/Calendar | Alarm, Leap Year, Unique ID | - | 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-TDFN (3x3) |

