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 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | |
Renesas
|
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
|
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Price on request
Price and Stock
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
|
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Renesas
|
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Epson
|
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1µA ~ 2µA @ 3V ~ 5V | - | Alarm | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Clock/Calendar | 1.6V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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1.1mA @ 3.3V | YY-MM-DD-dd | Leap Year | Parallel | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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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 | 10-TDFN (3x3) | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 3.6V | |
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EM Microelectronic
|
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15µA @ 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 ~ 5.5V | |
Epson
|
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1.6µA ~ 2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | SPI, 4-Wire Serial | - | Surface Mount | -40°C ~ 125°C | 14-SOP | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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1.4µA ~ 1.5µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 2.5V ~ 5.5V | |
Epson
|
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1.5µA ~ 1.6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | I²C | - | Surface Mount | -40°C ~ 105°C (TA) | 10-SMD | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
|
Epson
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- | - | - | - | - | - | - | - | - | - | - | |
Diodes Incorporated
|
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150µA @ 1.5V ~ 5.5V | YY-MM-DD-dd | Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C (TA) | 8-TDFN (2x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | |
Diodes Incorporated
|
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1.5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C (TA) | 8-TDFN (2x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | |
|
EM Microelectronic
|
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0.35µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, RAM | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS | Clock/Calendar | 1.5V ~ 5.5V | |
|
Abracon LLC
|
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2µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, TCXO/Crystal | I²C | - | Surface Mount | -40°C ~ 85°C | 8-SMT | HH:MM:SS:hh | Clock/Calendar | 1.3V ~ 5.5V | |
|
Renesas
|
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200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
|
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
|
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
|
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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Price on request
Price and Stock
on Request |
200µA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | 0°C ~ 70°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | |
Analog Devices / Maxim Integrated
|
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Price and Stock
on Request |
200µA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | |
|
Epson
|
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2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | SPI | 16B | Surface Mount | -40°C ~ 85°C | 20-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Renesas
|
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14µA ~ 15µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, SRAM | I²C, 2-Wire Serial | 128B | Surface Mount | -40°C ~ 85°C | 20-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
|
NXP Semiconductors
|
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Price on request
Price and Stock
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0.6µA ~ 0.75µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | Die | HH:MM:SS (24 hr) | Clock/Calendar | 1V ~ 5.5V | |
Renesas
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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Price on request
Price and Stock
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
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Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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1µA ~ 2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | Parallel | - | Through Hole | -40°C ~ 85°C | 18-DIP | HH:MM:SS (24 hr) | Clock/Calendar | 2.4V ~ 5.5V | |
Epson
|
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1.6µA ~ 2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 4-Wire Serial | - | Surface Mount | -40°C ~ 125°C | 14-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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Price and Stock
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1µA ~ 2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 3-Wire Serial | - | 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
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1µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 125°C | 14-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
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1µA ~ 3µA @ 2V ~ 5V | YY-MM-DD-dd | Leap Year | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 18-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 5.5V | |
Epson
|
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Price on request
Price and Stock
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1µA ~ 2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 3-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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Price on request
Price and Stock
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1µA ~ 2µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 22-SON (5x6) | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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- | YY-MM-DD-dd | Alarm, Leap Year | 3-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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1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Epson
|
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0.7µA ~ 0.9µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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0.7µA ~ 0.9µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | 3-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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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 |
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