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 | AEC Qualified | Automotive Grade | Current | Date Format | Features | Industrial Grade | Interface | Lead Spacing | Lead Style | Medical Grade | Memory Size | Military Grade | Mounting Type | Operating Range | Operating Temperature | Operating Voltage | SVHC Present | Supplier Device Package | Supplier Package | Tape & Reel | Time Format | Type | Voltage | Voltage Supply | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
STMicroelectronics
|
16
|
Price on request
|
- | - | 1.4mA @ 2.7V ~ 3.6V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer | - | SPI | - | Gull-Wing | - | 44B | - | Surface Mount | - | -40°C ~ 85°C | - | - | 28-SO | - | - | HH:MM:SS:hh (24 hr) | Clock/Calendar | 2.5V ~ 3.5V | - | |
Analog Devices / Maxim Integrated
|
14
|
Price on request
|
- | - | 0.45µA | Binary | Unique ID | - | 1-Wire® Serial | 6.0 mm | J-Lead | - | - | - | Surface Mount | - | -40°C | - | - | 6-TSOC | 6-TSOC | Tape & Reel | Binary | Binary Counter | 2.5V | - | |
STMicroelectronics
|
14
|
$5.21
|
- | - | 2mA @ 3V ~ 3.6V | YY-MM-DD-dd | Leap Year | - | Parallel | - | - | - | - | - | Surface Mount | - | 0°C ~ 70°C | - | - | 28-SOH | 28-SOH | - | HH:MM:SS (24 hr) | Clock/Calendar | 3V ~ 3.6V | - | |
STMicroelectronics
|
12
|
$5.21
|
No | No | 3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Leap Year | No | Parallel | 15.24 mm | - | No | - | No | Through Hole | - | 0°C ~ 70°C | - | - | 28-PCDIP, CAPHAT® | 28-PCDIP, CAPHAT® | No | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | - | |
Intersil
|
11
|
Price on request
|
No | No | 10µA ~ 20µA @ 2.7V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, Supervisor, Unique ID, Watchdog Timer | No | I²C, 2-Wire Serial | - | - | No | - | No | Surface Mount | - | -40°C ~ 85°C | - | - | 8-TSSOP | - | No | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | - | |
Analog Devices / Maxim Integrated
|
10
|
Price on request
|
- | - | 4mA @ 3V ~ 3.6V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | - | Parallel | 7.5 mm | Through Hole | - | 256B | - | Surface Mount | - | 0°C ~ 70°C | - | - | 28-SOIC | 28-SOIC | - | HH:MM:SS (24 hr) | Clock/Calendar | 3.3V | - | |
Analog Devices / Maxim Integrated
|
7
|
Price on request
|
- | - | 175µA | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | - | SPI | - | - | - | - | - | Surface Mount | - | -40°C | - | - | 10-uMAX/uSOP | 10-uMAX/uSOP | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.3V | - | |
Analog Devices / Maxim Integrated
|
7
|
Price on request
|
- | - | 0.3µA to 1µA @ 2V to 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Trickle-Charger | - | 3-Wire Serial | - | - | - | 31B | - | Through Hole | - | -40°C to +85°C | - | - | 8-PDIP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.0V to 5.5V | - | |
Analog Devices / Maxim Integrated
|
6
|
Price on request
|
- | - | 300µA | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | - | 3-Wire Serial | - | Through-Hole | - | - | - | 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
|
5
|
Price on request
|
- | - | 10mA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM | - | Parallel | 15.24 mm | - | - | 512KB | - | Through Hole | Full 10% Operating Range | 0°C ~ 70°C | - | - | 32-EDIP | 32-EDIP | No | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 4.5V ~ 5.5V | - | |
Epson
|
5
|
$5.21
|
- | - | 1.2µA ~ 1.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | - | I²C, 2-Wire Serial | 5.3 mm | - | - | - | - | Surface Mount | - | -40°C ~ 85°C | - | - | 14-SOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.7V ~ 5.5V | 1.7V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
5
|
Price on request
|
- | - | 10mA | YY-MM-DD-dd | Leap Year, NVSRAM | - | Parallel | 15.24 mm | Through Hole | - | 512Kb | - | Through Hole | - | 0°C / 70°C | - | - | 32-EDIP | 32-EDIP | - | HH:MM:SS:hh (12/24 hr) | Phantom Time Chip | 4.5V / 5V / 5.5V | - | |
Analog Devices / Maxim Integrated
|
4
|
Price on request
|
- | - | 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 | - | - | 14-TDFN (3x3) | 14-TDFN | No | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | - | |
Analog Devices / Maxim Integrated
|
4
|
Price on request
|
- | - | 150µA @ 5.5V | YY-MM-DD-dd | Leap Year, Trickle-Charger | - | I²C, 2-Wire Serial | - | - | - | - | - | Surface Mount | - | -40°C to 85°C | - | - | 16-SOIC | - | Yes | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V to 5.5V | - | |
|
Analog Devices / Maxim Integrated
|
3
|
Price on request
|
- | - | 25.3µA | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Trickle-Charger | - | SPI | 7.62 mm | - | - | 96B | - | Through Hole | - | 0°C | - | - | 16-PDIP | 16-PDIP | No | 12/24 hr | Clock/Calendar | 2V | - | |
|
Analog Devices / Maxim Integrated
|
3
|
Price on request
|
- | - | 200µA | YY-MM-DD-dd | Alarm; Leap Year; Square Wave Output; Trickle-Charger | - | I²C | - | - | - | - | - | Surface Mount | - | -40°C | 1.8V | - | 8-uMAX/uSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | - | |
|
STMicroelectronics
|
3
|
$5.21
|
- | - | 2mA @ 3V ~ 3.6V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | - | Parallel | - | - | - | - | - | Surface Mount | - | 0°C ~ 70°C | - | - | 44-SOH | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 3V ~ 3.6V | - | |
Analog Devices / Maxim Integrated
|
3
|
Price on request
|
No | No | 50µA @ 5V | Binary | - | No | 3-Wire Serial | - | - | No | - | No | Through Hole | - | 0°C ~ 70°C | - | - | 14-EDIP | - | No | Binary | Elapsed Time Counter | 3V ~ 4.5V | - | |
Analog Devices / Maxim Integrated
|
2
|
Price on request
|
- | - | 3mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 4KB | - | Through Hole | - | 0°C ~ 70°C | - | - | 24-EDIP | - | No | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | - | |
Analog Devices / Maxim Integrated
|
2
|
Price on request
|
- | - | 3mA @ 5V | YY-MM-DD-dd | Alarm, NVSRAM, Square Wave Output, Y2K | - | Parallel | - | - | - | 242B | - | Through Hole | - | -40°C ~ 85°C | 5V | - | 24-EDIP | - | No | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 3.7V | - | |
Renesas
|
2
|
Price on request
|
- | - | 4µA ~ 6µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, SRAM | - | I2C, 2-Wire Serial | - | - | - | 8B | - | Surface Mount | - | -40°C ~ 85°C | - | - | 8-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | 2.7V ~ 5.5V | |
Cymbet Corporation
|
2
|
Price on request
|
- | - | - | YY-MM-DD-dd | Alarm, Leap Year | - | I²C, 2-Wire Serial | - | - | - | - | - | Surface Mount | - | -10°C to 70°C | - | Not Present | 16-QFN (5x5) | - | Tape & Reel (TR) | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.75V to 3.25V | - | |
Analog Devices / Maxim Integrated
|
1
|
Price on request
|
No | No | 4mA @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Leap Year, NVSRAM | No | Parallel | - | - | No | 128KB | No | Surface Mount | - | 0°C ~ 70°C | - | - | 34-PowerCap Module | 34-PowerCap Module | No | HH:MM:SS (24 hr) | Clock/Calendar | 5V | - | |
|
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | - | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | - | I²C | - | - | - | - | - | Surface Mount | - | -40°C ~ 85°C | - | - | 16-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | - | |
|
Renesas
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | - | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | - | I²C | - | - | - | - | - | Surface Mount | - | -40°C ~ 85°C | - | - | 16-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | - | |
Diodes Incorporated
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 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-SOIC | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V ~ 5.5V | - | |
Micro Crystal AG
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, RAM, Trickle Charger | - | I²C, 2-Wire Serial | - | - | - | 2B, 8B | - | Surface Mount | - | -40°C ~ 85°C | - | - | 10-SON (3.7x2.5) | - | - | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | |
Micro Crystal AG
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, RAM, Trickle Charger | - | I²C, 2-Wire Serial | - | - | - | 2B, 8B | - | Surface Mount | - | -40°C ~ 125°C | - | - | 10-SON (3.7x2.5) | - | - | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | |
Micro Crystal AG
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, RAM, Trickle Charger | - | SPI, 4-Wire Serial | - | - | - | 2B, 8B | - | Surface Mount | - | -40°C ~ 85°C | - | - | 10-SON (3.7x2.5) | - | - | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | |
Micro Crystal AG
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, RAM, Trickle Charger | - | SPI, 4-Wire Serial | - | - | - | 2B, 8B | - | Surface Mount | - | -40°C ~ 125°C | - | - | 10-SON (3.7x2.5) | - | - | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | |
Micro Crystal AG
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, RAM, Trickle Charger | - | I²C, 2-Wire Serial | - | - | - | 2B, 8B | - | Surface Mount | - | -40°C ~ 125°C | - | - | 10-SON (3.7x2.5) | - | - | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | |
Micro Crystal AG
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, RAM, Trickle Charger | - | SPI, 4-Wire Serial | - | - | - | 2B, 8B | - | Surface Mount | - | -40°C ~ 125°C | - | - | 10-SON (3.7x2.5) | - | - | HH:MM:SS | Clock/Calendar | 1.3V ~ 5.5V, 2.1V ~ 5.5V | - | |
|
Diodes Incorporated
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 150µA @ 1.5V ~ 5.5V | YY-MM-DD-dd | RAM, 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
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1.5mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, RAM, Square Wave Output | - | I²C, 2-Wire Serial | - | - | - | 56B | - | Surface Mount | - | -40°C ~ 85°C (TA) | - | - | 8-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | - | |
|
Analog Devices / Maxim Integrated
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 0.65µA ~ 0.7µA @ 1.1V ~ 5.5V | YY-MM-DD-dd | Alarm, Leap Year, RAM, Square Wave Output, Trickle Charger | - | Serial | - | - | - | 32B | - | Surface Mount | - | -40°C ~ 85°C (TA) | - | - | 12-WLP (1.63x1.23) | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 1.1V ~ 5.5V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 100µA @ 3V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 242B | - | Surface Mount | - | 0°C ~ 70°C | - | - | 24-SSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | - | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 242B | - | Through Hole | - | 0°C ~ 70°C | - | - | 24-DIP Module | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 4.5V ~ 5.5V | - | |
Texas Instruments
|
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Price on request
Price and Stock
on Request |
- | - | 300µA @ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 114B | - | Through Hole | - | 0°C ~ 70°C | - | - | 24-PDIP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | - | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 114B | - | Surface Mount | - | - | - | - | 24-SOIC | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 4mA @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Alarm, Supervisor, Watchdog Timer | - | Parallel | - | - | - | - | - | Through Hole | - | 0°C ~ 70°C | - | - | 32-DIP Module (18.42x42.8) | - | - | HH:MM:SS:hh (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | - | Parallel | - | - | - | - | - | Through Hole | - | 0°C ~ 70°C | - | - | 28-PDIP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.3V ~ 4V | - | |
NXP Semiconductors
|
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Price on request
Price and Stock
on Request |
- | - | 0.6µA ~ 0.75µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | - | I²C, 2-Wire Serial | - | - | - | - | - | Surface Mount | - | -40°C ~ 85°C | - | - | 8-SO | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm | - | Parallel | - | - | - | - | - | Through Hole | - | 0°C ~ 70°C | - | - | 32-DIP Module (18.42x42.8) | - | - | HH:MM:SS (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | - | |
Texas Instruments
|
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Price on request
Price and Stock
on Request |
- | - | 1mA @ 4.5V ~ 5.5V | YY-MM-DD-dd | Alarm, Supervisor, Watchdog Timer | - | Parallel | - | - | - | - | - | Through Hole | - | 0°C ~ 70°C | - | - | 36-DIP Module | - | - | HH:MM:SS:hh (24 hr) | Clock/Calendar | 4.5V ~ 5.5V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | - | Parallel | - | - | - | - | - | Surface Mount | - | 0°C ~ 70°C | - | - | 28-SOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 1.5mA (Typ) @ 2.7 V ~ 3.6 V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | - | Parallel | - | - | - | - | - | Surface Mount | - | 0°C ~ 70°C | - | - | 28-SOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | - | |
NXP Semiconductors
|
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Price on request
Price and Stock
on Request |
- | - | 8µA ~ 15µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, NVSRAM | - | I²C, 2-Wire Serial | - | - | - | 8B | - | Surface Mount | - | -40°C ~ 85°C | - | - | 8-SO | - | - | HH:MM:SS:hh (12/24 hr) | Clock/Calendar | 2.5V ~ 6V | - | |
Texas Instruments
|
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Price on request
Price and Stock
on Request |
- | - | 300µA @ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 242B | - | Surface Mount | - | 0°C ~ 70°C | - | - | 24-SSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 300µA @ 5V | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | - | Parallel | - | - | - | 242B | - | Surface Mount | - | 0°C ~ 70°C | - | - | 24-SSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.5V ~ 4V | - | |
Texas Instruments
|
Send RFQ |
Price on request
Price and Stock
on Request |
- | - | 100µA @ 3V | YY-MM-DD-dd | Alarm, Daylight Savings, NVSRAM | - | Parallel | - | - | - | 242B | - | Surface Mount | - | 0°C ~ 70°C | - | - | 24-SSOP | - | - | HH:MM:SS (12/24 hr) | Clock/Calendar | 2.4V ~ 4V | - |
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