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.
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| Part & Mfr | Current | Date Format | Features | Interface | Memory Size | Mounting Type | Operating Temperature | Supplier Device Package | Time Format | Type | Voltage | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Epson
|
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1µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Watchdog Timer | SPI | - | Surface Mount | -40°C ~ 85°C | 24-SOP | HH:MM:SS (24 hr) | Time Event Recorder | 1.4V ~ 5.5V | |
Epson
|
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0.8µA ~ 1.2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
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0.8µA ~ 1.2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (5x6) | HH:MM:SS (24 hr) | 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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2.8µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
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2.8µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD-dd | Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger | SPI | 96B | Surface Mount | -40°C ~ 85°C | 14-TDFN (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD-dd | Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger | SPI | 96B | Surface Mount | -40°C ~ 85°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD-dd | Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger | SPI | 96B | Surface Mount | -40°C ~ 85°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Diodes Incorporated
|
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0.65µA ~ 0.85µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 8-MSOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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0.7µA ~ 0.8µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | SPI | - | Surface Mount | -40°C ~ 85°C | 8-TDFN (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
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Analog Devices / Maxim Integrated
|
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200µA @ 1.71V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-TDFN EP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
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0.5µA ~ 0.6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-TDFN (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
STMicroelectronics
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70µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Leap Year | I²C, 2-Wire Serial | - | Through Hole | 0°C ~ 70°C | 24-PCDIP, CAPHAT® | HH:MM:SS (24 hr) | Clock/Calendar | Integrated | |
Abracon LLC
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2µA @ 3V | YY-MM-DD | Alarm, Leap Year, Square Wave Output, TCXO/Crystal | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SMT | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer | SPI | 256B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, Trickle-Charger | SPI | - | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger | SPI | 64B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer | SPI | 256B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, Trickle-Charger | SPI | - | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger | SPI | 64B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
|
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
|
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | 256B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
|
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Abracon LLC
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0.17µA ~ 0.22µA @ 1.8V ~ 3V | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | 256B | Surface Mount | -40°C ~ 85°C | 16-QFN (3x3) | HH:MM:SS:hh | Clock/Calendar | 1.5V ~ 3.6V | |
Kyocera AVX
|
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2µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | SMD | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V | |
Renesas
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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Analog Devices / Maxim Integrated
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7mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 512KB | - | 0°C ~ 70°C | - | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 3V | |
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Analog Devices / Maxim Integrated
|
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7mA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM | Parallel | 512KB | - | 0°C ~ 70°C | - | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 3V | |
Renesas
|
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2µA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V |
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