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 | Access Time | Current | Date Format | Features | Interface | Memory Size | Mounting Type | Operating Temperature | Supplier Device Package | Supply Current | Tape & Reel | Time Format | Type | Voltage | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
NXP Semiconductors
|
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- | 0.885µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | I²C | - | Surface Mount | -40°C ~ 85°C (TA) | 10-TSSOP | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 0.9V ~ 5.5V | |
Diodes Incorporated
|
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- | 70µA @ 1.5V ~ 5.5V | YY-MM-DD-dd | Leap Year, Square Wave Output, Y2K | I²C, 2-Wire Serial | 56B | Surface Mount | -40°C ~ 85°C | 8-SOIC | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 2V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | 200µA @ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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- | 130µA ~ 200µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 5.5V | |
|
EM Microelectronic
|
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- | 15µA @ 3V | 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 | |
NXP Semiconductors
|
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- | 1.5µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SO | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 4.2V | |
Analog Devices / Maxim Integrated
|
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- | 110µA ~ 170µA @ 3.63V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, TCXO/Crystal | I²C, 2-Wire Serial | - | Surface Mount | 0°C ~ 70°C | 16-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | 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
|
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- | 1.3mA @ 5V | YY-MM-DD-dd | Leap Year | Parallel | - | Through Hole | 0°C ~ 70°C | 16-PDIP | - | - | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 2.5V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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- | 4mA @ 3V ~ 3.6V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Parallel | 256B | Through Hole | 0°C ~ 70°C | 28-EDIP | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 2.5V ~ 3.7V | |
|
Epson
|
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- | 2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm | 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | - | HH:MM:SS | Clock/Calendar | 1.6V ~ 5.5V | |
STMicroelectronics
|
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|
$5.21
|
150ns | 3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Leap Year, Watchdog Timer | Parallel | 8000B | Through Hole | 0°C ~ 70°C | 28-PCDIP, CAPHAT® | 3mA | No | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | |
NXP Semiconductors
|
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- | 0.33µA ~ 0.38µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | SPI | - | Surface Mount | -40°C ~ 85°C | 14-TSSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.6V ~ 5.5V | |
ABLIC Inc.
|
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- | 14µA ~ 30µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOP-J | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
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 | 113B | Through Hole | 0°C ~ 70°C | 24-EDIP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | |
Microchip Technology
|
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- | 1µA @ 1.8V ~ 3.6V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID | SPI | 64B | Surface Mount | -40°C ~ 85°C | 10-MSOP | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
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 | |
NXP Semiconductors
|
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|
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- | 10µA ~ 50µA @ 1V ~ 5V | YY-MM-DD | Alarm, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 240B | Surface Mount | -40°C ~ 85°C | 8-SO | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.5V ~ 6V | |
NXP Semiconductors
|
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- | 10µA ~ 50µA @ 1V ~ 5V | YY-MM-DD | Alarm, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 240B | Surface Mount | -40°C ~ 85°C | 8-SO | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.5V ~ 6V | |
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-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 3.6V | |
|
EM Microelectronic
|
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- | 10µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | 3-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
|
EM Microelectronic
|
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- | 0.8µA @ 5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | 3-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.2V ~ 5.5V | |
Renesas
|
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- | 4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | - | - | HH:MM:SS:hh (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
NXP Semiconductors
|
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|
Price on request
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on Request |
- | 1.5µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SO | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 4.2V | |
Analog Devices / Maxim Integrated
|
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- | 3µA ~ 3.5µA @ 3V ~ 5.5V | YY-MM-DD | Alarm | I²C | - | Surface Mount | -40°C ~ 85°C | 10-LGA (5x5) | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | 175µA @ 2.97V ~ 5.5V | Binary | Alarm, Square Wave Output, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 16-SOIC | - | - | Binary | Binary Counter | 1.3V ~ 5.5V | |
Epson
|
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- | 2.5µA @ 3V | - | Alarm | SPI | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | - | - | - | Time Event Recorder | 1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | 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 | |
STMicroelectronics
|
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- | 3mA @ 4.75V ~ 5.5V | YY-MM-DD-dd | Leap Year | Parallel | - | Through Hole | 0°C ~ 70°C | 28-PCDIP, CAPHAT® | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 4.75V ~ 5.5V | |
|
Epson
|
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- | 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 | |
|
Microchip Technology
|
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- | 1µA @ 5.5V | 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 (Typ) @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 85°C | 8-TSSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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- | 1µA @ 1.8V ~ 3.6V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID | SPI | 64B | Surface Mount | -40°C ~ 85°C | 10-MSOP | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
Microchip Technology
|
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- | 1.2µA (Typ) @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | I²C, 2-Wire Serial | 64B | Surface Mount | -40°C ~ 85°C | 8-MSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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- | 1.2µA @ 3.3V | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | I²C, 2-Wire Serial | 64B, 1Kb | Surface Mount | -40°C ~ 85°C | 8-MSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Microchip Technology
|
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- | 1µA @ 1.8V ~ 3.6V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID | SPI | 64B | Surface Mount | -40°C ~ 85°C | 10-MSOP | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
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 ~ 3.6V | |
Microchip Technology
|
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- | 1µA @ 1.8V ~ 5.5V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Watchdog Timer | SPI | 64B | Surface Mount | -40°C ~ 85°C | 14-TSSOP | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 3.6V | |
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 ~ 3.6V | |
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 ~ 3.6V | |
Renesas
|
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- | 0.3µA @ 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-TSSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Epson
|
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- | 2.1µA ~ 3.4µA @ 3V ~ 5V | YY-MM-DD | Alarm | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 14-SOP | - | - | - | Clock/Calendar | 1.6V ~ 5.5V | |
Epson
|
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- | 0.55µA ~ 0.6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, RAM | I²C, 2-Wire Serial | 16B | 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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- | 100µA @ 1.89V | YY-MM-DD-dd | Leap Year, Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Analog Devices / Maxim Integrated
|
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- | 120µA ~ 160µA @ 3.63V ~ 5.5V | 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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- | 140µA @ 2.7V ~ 3.3V | YY-MM-DD-dd | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | 512B | Surface Mount | -40°C ~ 85°C | 8-SOIC | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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- | 200µA @ 3.3V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | 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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- | 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 | |
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 | 22-SON (5x6) | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | |
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 | Through Hole | -40°C ~ 85°C | 24-PDIP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V |
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