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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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 (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 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, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Epson
|
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2.5µA @ 3V | YY-MM-DD-dd | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | HH:MM:SS (12/24 hr) | Time Event Recorder | 1V ~ 5.5V | |
Renesas
|
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4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | I²C, 2-Wire Serial | 2B | Surface Mount | -40°C ~ 85°C | 10-MSOP | HH:MM:SS (12/24 hr) | Time Event Recorder | 1.8V ~ 5.5V | |
Renesas
|
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4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | I²C, 2-Wire Serial | 2B | Surface Mount | -40°C ~ 85°C | 10-MSOP | HH:MM:SS (12/24 hr) | Time Event Recorder | 1.8V ~ 5.5V | |
Renesas
|
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4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | I²C, 2-Wire Serial | 2B | Surface Mount | -40°C ~ 85°C | 10-MSOP | HH:MM:SS (12/24 hr) | Time Event Recorder | 1.8V ~ 5.5V | |
Abracon LLC
|
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1.5µA ~ 2.2µA @ 1.4V ~ 5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Trickle-Charger | SPI | 8B | Surface Mount | -40°C ~ 85°C | Module | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.4V ~ 5.5V | |
Epson
|
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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 | 14-SOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Epson
|
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2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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2mA @ 2.97V ~ 3.63V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | - | 114B | Surface Mount | -40°C ~ 85°C (TA) | 24-SOIC | HH:MM:SS | Clock/Calendar | 2V ~ 3.05V | |
Analog Devices / Maxim Integrated
|
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0.6µA ~ 0.7µA @ 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 | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Texas Instruments
|
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- | - | - | - | - | - | - | - | - | - | - | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, SRAM, Supervisor, Watchdog Timer, Y2K | I²C, 2-Wire Serial | 32KB | Surface Mount | -40°C ~ 85°C (TA) | 14-TSSOP | HH:MM:SS:hh (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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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 | 14-SOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
Texas Instruments
|
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- | - | - | - | - | - | - | - | - | - | - | |
Analog Devices / Maxim Integrated
|
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125µA @ 2.7V ~ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | SPI | - | 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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120µA ~ 200µA @ 1.89V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, NVRAM, Square Wave Output, Trickle-Charger | 3-Wire Serial, SPI | 96B | Surface Mount | -40°C ~ 85°C (TA) | 14-TDFN-EP (3x3) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Harris Semiconductor
|
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200µA @ 10V | YY-MM-DD | Alarm, Leap Year | - | - | Through Hole | -40°C ~ 85°C (TA) | 24-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 4V ~ 10.5V | |
Analog Devices / Maxim Integrated
|
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270µA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | I²C | 512B | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
|
Analog Devices / Maxim Integrated
|
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150µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
BenchPro
|
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- | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Parallel | 242B | Surface Mount | - | 24-SSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Intersil
|
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18µA @ 5.5V | YY-MM-DD-dd | Alarm, SRAM, Trickle-Charger | I²C, 2-Wire Serial | 128B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | HH:MM:SS:hh (12/24 hr) | Time Event Recorder | 1.8V ~ 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 | 10-SMD | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
Renesas
|
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0.65µA @ 1.8V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-MSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
Intersil
|
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10µA ~ 20µA @ 2.7V ~ 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 | |
BenchPro
|
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100µA @ 3V | YY-MM-DD-dd | Alarm, Daylight Savings, NVSRAM | Parallel | 242B | Surface Mount | 0°C ~ 70°C | 24-SSOP/QSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | |
Analog Devices / Maxim Integrated
|
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150µA @ 3.3V | YY-MM-DD | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 16-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Intersil
|
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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 | |
Elantec Semiconductor Inc
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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 | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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 | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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 | 8-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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 | |
Intersil
|
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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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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 | |
Intersil
|
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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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Elantec Semiconductor Inc
|
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10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Supervisor, Watchdog Timer | I²C | 512B | Surface Mount | -40°C ~ 85°C (TA) | 14-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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 | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Intersil
|
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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-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V |
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