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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Epson
|
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2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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100µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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15mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 114B | Surface Mount | -40°C ~ 85°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Analog Devices / Maxim Integrated
|
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2mA @ 2.7V ~ 3.7V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | 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 |
3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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Price on request
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on Request |
300µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-SOIC | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Y2K | I²C, 2-Wire Serial | 32B | Through Hole | -40°C ~ 85°C | 8-PDIP | HH:MM:SS (12/24 hr) | Time Event Recorder | 2.6V ~ 3.5V | |
|
Epson
|
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Price on request
Price and Stock
on Request |
2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1V ~ 5.5V | |
|
Epson
|
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700nA ~ 900nA @ 3V ~ 5V | YY-MM-DD | Alarm | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V | |
Epson
|
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Price on request
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1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.15V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.5µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (12/24 hr) | Time Event Recorder | 1V ~ 5.5V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | - | Time Event Recorder | 1V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.5µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (12/24 hr) | Time Event Recorder | 1V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 10-SMD | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.7V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.15V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
0.7µA ~ 0.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | HH:MM:SS | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
|
Epson
|
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Price on request
Price and Stock
on Request |
0.7µA ~ 0.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | HH:MM:SS | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.5µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (12/24 hr) | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
2mA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer, Y2K | Parallel | - | Surface Mount | -40°C ~ 85°C | 48-LQFP (7x7) | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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Price on request
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on Request |
6mA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer, Y2K | Parallel | - | Surface Mount | -40°C ~ 85°C | 48-LQFP (7x7) | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.5µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (12/24 hr) | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Parallel | 256B | Surface Mount | 0°C ~ 70°C | 28-SOIC | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.7V ~ 5.5V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.7V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.15V ~ 5.5V | |
|
EM Microelectronic
|
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Price on request
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15µA @ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | - | 8B | Surface Mount | -40°C ~ 85°C (TA) | 28-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2V ~ 4V | |
|
Epson
|
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Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | SPI | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.5µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (12/24 hr) | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
2mA @ 2.7V ~ 3.7V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 2KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
0.7µA ~ 0.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 22-SON (6.3x4.8) | HH:MM:SS | Clock/Calendar | 1.8V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
1.5µA ~ 1.6µA @ 3V ~ 5V | YY-MM-DD | Alarm, Watchdog Timer | I²C | - | Surface Mount | -40°C ~ 105°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 1.5V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | SPI | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
|
Epson
|
Send RFQ |
Price on request
Price and Stock
on Request |
2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
3mA @ 5V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | -40°C ~ 85°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
2mA @ 3V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | Parallel | 242B | Surface Mount | -40°C ~ 85°C | 28-PLCC (11.51x11.51) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Parallel | 256B | Surface Mount | -40°C ~ 85°C | 28-SOIC | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 4KB | Surface Mount | 0°C ~ 70°C | 24-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
300µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | 3-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Portable System Controller | 2.5V ~ 3.7V | |
STMicroelectronics
|
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4mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Leap Year | Parallel | - | Through Hole | 0°C ~ 70°C | 32-PMDIP | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Parallel | 256B | Through Hole | -40°C ~ 85°C | 28-PDIP | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
SparkFun Electronics
|
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120µA ~ 160µA @ 3.63V ~ 5.5V | YY-MM-DD | Alarm, Leap Year, Square Wave Output, SRAM | SPI | 256B | Surface Mount | 0°C ~ 70°C (TA) | 20-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.8V | |
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Parallel | 256B | Surface Mount | 0°C ~ 70°C | 28-SOIC | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V |
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