What are Real Time Clocks ?
Real Time Clocks (RTCs) are integrated circuits designed to keep track of the current time and date, even when the main power is off. They are widely used in applications such as timers, clocks, and scheduling devices in consumer electronics and industrial systems. Important specifications for selecting RTCs include Current, which affects power consumption; Date Format, which determines how the time is displayed; and Operating Temperature, which ensures reliable performance in different environments. Procurement teams should validate lifecycle status and consider alternate-source options to mitigate sourcing risks.
Parts in this category
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| Part & Mfr | Current | Date Format | Features | Interface | Memory Size | Mounting Type | Operating Temperature | Supplier Device Package | Time Format | Type | Voltage | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Epson
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on Request |
0.8µA ~ 1.2µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | - | Clock/Calendar | 1.8V ~ 5.5V | |
|
Epson
|
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Price on request
Price and Stock
on Request |
0.8µA ~ 1.2µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | - | Clock/Calendar | 1.8V ~ 5.5V | |
|
Epson
|
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0.8µA ~ 1.2µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | - | Clock/Calendar | 1.8V ~ 5.5V | |
|
Epson
|
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1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Unique ID | I²C | 80b | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
|
Epson
|
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1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Unique ID | I²C | 80b | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
|
Epson
|
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Price on request
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1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Unique ID | I²C | 80b | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
|
Epson
|
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1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Unique ID | I²C | 80b | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Diodes Incorporated
|
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0.8µA @ 1.3V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Diodes Incorporated
|
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0.8µA @ 1.2V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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Analog Devices / Maxim Integrated
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Price and Stock
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Analog Devices / Maxim Integrated
|
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Price and Stock
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Analog Devices / Maxim Integrated
|
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Price and Stock
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Analog Devices / Maxim Integrated
|
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Microchip Technology
|
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1.2µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Microchip Technology
|
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1.2µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 125°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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0.33µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C | - | Surface Mount | -40°C ~ 85°C | 8-WLP (.97x1.97) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 3.6V | |
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Analog Devices / Maxim Integrated
|
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Price and Stock
on Request |
- | - | - | - | - | - | - | - | - | - | - | |
Epson
|
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Price and Stock
on Request |
1µA ~ 3µA @ 2V ~ 5V | - | - | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 2.5V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1µA ~ 3µA @ 2V ~ 5V | - | - | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 2.5V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1µA ~ 3µA @ 2V ~ 5V | - | - | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 2.5V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1µA ~ 2µA @ 3V ~ 5V | - | Alarm | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
0.8µA ~ 1.2µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
0.8µA ~ 1.2µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1µA ~ 3µA @ 2V ~ 5V | - | - | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 2.5V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
0.8µA ~ 1.2µA @ 3V ~ 5V | - | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1.8V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
0.33µA ~ 0.39µA @ 1.6V ~ 3.6V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C | 64B | Surface Mount | -40°C ~ 85°C | 12-WLP (2.14x1.56) | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 3.6V | |
Analog Devices / Maxim Integrated
|
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Price and Stock
on Request |
- | - | - | - | - | - | - | - | - | - | - | |
Analog Devices / Maxim Integrated
|
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4mA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Parallel | 32KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS (24 hr) | Clock/Calendar | 2.97V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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7mA @ 3.3V | YY-MM-DD-dd | NVSRAM | Parallel | 128KB | Through Hole | -40°C ~ 85°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.97V ~ 3.63V | |
|
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
500µA @ 2.2V | Binary | Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | Binary | Binary Counter | 1.3V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
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125µA @ 2.7V ~ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 10-uMAX/uSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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7mA @ 3.3V | YY-MM-DD-dd | NVSRAM | Parallel | 128KB | Surface Mount | -40°C ~ 85°C | 34-PowerCap Module | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 3V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Through Hole | 0°C ~ 70°C | 24-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
7mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 512KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.97V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
7mA @ 3.3V | YY-MM-DD-dd | NVSRAM | Parallel | 128KB | Through Hole | 0°C ~ 70°C | 32-EDIP | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.97V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
500µA @ 2.2V | Binary | Trickle-Charger | I²C, 2-Wire Serial | - | Through Hole | -40°C ~ 85°C | 8-PDIP | Binary | Binary Counter | 1.3V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
125µA @ 2.7V ~ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 10-uMAX/uSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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2mA @ 3V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | 0°C ~ 70°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
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Analog Devices / Maxim Integrated
|
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Analog Devices / Maxim Integrated
|
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Analog Devices / Maxim Integrated
|
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Analog Devices / Maxim Integrated
|
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Analog Devices / Maxim Integrated
|
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Diodes Incorporated
|
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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | 3-Wire Serial | 31B | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.2V ~ 5.5V | |
Diodes Incorporated
|
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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | 3-Wire Serial | 31B | Surface Mount | -40°C ~ 85°C (TA) | 8-TDFN (2x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.2V ~ 5.5V | |
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Renesas
|
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0.6µA @ 1.3V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
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Renesas
|
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0.6µA @ 1.3V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
|
Renesas
|
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0.6µA @ 1.3V ~ 1.8V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
|
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5µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C | 56b | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V |
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