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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0.4µA @ 3V | YY-MM-DD | Alarm, RAM | I²C | 16B | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS | 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-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
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 | 12-WLP (2.14x1.56) | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 3.6V | |
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 | |
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-SOIC | HH:MM:SS (24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
Diodes Incorporated
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250µA @ 3V ~ 5.5V | YY-MM-DD | Alarm, Leap Year, Square Wave Output | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 3.7V | |
ABLIC Inc.
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0.93µA ~ 1.1µA @ 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 | |
ABLIC Inc.
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0.93µA ~ 1.1µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | SNT-8A | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Micro Crystal AG
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0.24µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Programmable Clock Output, RAM, Timer | I²C, 2-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 0.9V ~ 5.5V | |
Micro Crystal AG
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0.5µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Programmable Clock Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS:hh (24 hr) | Clock/Calendar | 1V ~ 4.4V | |
Analog Devices / Maxim Integrated
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175µA @ 2.97V ~ 5.5V | 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 ~ 5.5V | |
Micro Crystal AG
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0.24µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Programmable Clock Output, RAM, Timer | SPI, 3-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 0.9V ~ 5.5V | |
Micro Crystal AG
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0.06µA @ 3V | YY-MM-DD-dd | Alarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle Charger | I²C, 2-Wire Serial | 2B, 43B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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0.45µA @ 2.5V ~ 5.5V | Binary | Unique ID | 1-Wire® Serial | - | Surface Mount | -40°C ~ 85°C | 6-TSOC | Binary | Binary Counter | 2.5V ~ 5.5V | |
Micro Crystal AG
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0.06µA @ 3V | YY-MM-DD-dd | Alarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle Charger | I²C, 2-Wire Serial | 2B, 43B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.1V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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200µA @ 5V | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | I²C, 2-Wire Serial | 56B | Through Hole | 0°C ~ 70°C | 8-PDIP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 3.5V | |
Micro Crystal AG
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0.35µA @ 3V | YY-MM-DD-dd | Alarm, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer | I²C, 2-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (24 hr) | Clock/Calendar | 1.5V ~ 5.5V | |
Epson
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- | YY-MM-DD | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | Module | HH:MM:SS (24 hr) | Time Event Recorder | 1.1V ~ 5.5V | |
Micro Crystal AG
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0.35µA @ 3V | YY-MM-DD-dd | Alarm, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer | I²C, 2-Wire Serial | 1B | Surface Mount | -40°C ~ 85°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS (24 hr) | Clock/Calendar | 1.5V ~ 5.5V | |
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Analog Devices / Maxim Integrated
|
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1.3µA @ 1.7V ~ 5.5V | Binary | Alarm, Square Wave Output, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-uMAX/uSOP | Binary | Binary Counter | 1.7V ~ 5.5V | |
Micro Crystal AG
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1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger | I²C, 2-Wire Serial | 2B, 8B | Surface Mount | -40°C ~ 85°C (TA) | 10-SON (3.7x2.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Micro Crystal AG
|
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1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger | SPI, 4-Wire Serial | 2B, 8B | Surface Mount | -40°C ~ 85°C (TA) | 10-SON (3.7x2.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
|
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500µA @ 3.63V | Binary | Trickle-Charger | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-SOIC | Binary | Binary Counter | 1.3V ~ 3.63V | |
Analog Devices / Maxim Integrated
|
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- | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Y2K | I²C, 2-Wire Serial | 32B | Surface Mount | -40°C ~ 85°C | 8-SOIC | HH:MM:SS (12/24 hr) | Time Event Recorder | 2.6V ~ 3.5V | |
Micro Crystal AG
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210nA @ 3V | YY-MM-DD-dd | Alarm, Battery Switch, Clock Output Hz-MHz, Event Input, Temperature Alarm, Timer, Trickle Charge with Charge Pump | I²C, 2-Wire Serial | 16B, 32B | Surface Mount | -40°C ~ 105°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS:100th (24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Analog Devices / Maxim Integrated
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175µA @ 2.97V ~ 5.5V | 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 ~ 5.5V | |
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Analog Devices / Maxim Integrated
|
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150µA @ 5.5V | 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 ~ 5.5V | |
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 | |
Micro Crystal AG
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210nA @ 3V | YY-MM-DD-dd | Alarm, Battery Switch, Clock Output Hz-MHz, Event Input, Temperature Alarm, Timer, Trickle Charge with Charge Pump | I²C, 2-Wire Serial | 16B, 32B | Surface Mount | -40°C ~ 105°C (TA) | 8-SON (3.2x1.5) | HH:MM:SS:100th (24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Nisshinbo Micro Devices
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120µA ~ 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 | |
Micro Crystal AG
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0.18µA @ 3V | YY-MM-DD-dd | Alarm, Leap Year, Programmable Clock Output, Timer | SPI, 4-Wire Serial | - | Surface Mount | -40°C ~ 85°C (TA) | 10-SON (5x3.2) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.1V ~ 5.5V | |
Micro Crystal AG
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1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger | SPI, 4-Wire Serial | 2B, 8B | Surface Mount | -40°C ~ 125°C (TA) | 10-SON (3.7x2.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Micro Crystal AG
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1µA @ 3V | YY-MM-DD-dd | Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger | I²C, 2-Wire Serial | 2B, 8B | Surface Mount | -40°C ~ 125°C (TA) | 10-SON (3.7x2.5) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.3V ~ 5.5V | |
Abracon LLC
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0.4µA ~ 0.95µA @ 1V ~ 4.4V | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 8-CLCC (3.2x1.5) | HH:MM:SS:hh (24 hr) | Clock/Calendar | 1V ~ 4.4V | |
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-DFN (5.5x4.0) | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
ECS Inc.
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0.5µA @ 3V | YY-MM-DD | - | I²C | - | Surface Mount | -40°C ~ 85°C | 10-SMD | HH:MM:SS | Clock/Calendar | 1.6V ~ 5V | |
Epson
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0.65µA ~ 0.8µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 12-VSOJ | HH:MM:SS (24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
Analog Devices / Maxim Integrated
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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Trickle-Charger | SPI | 96B | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
Analog Devices / Maxim Integrated
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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | SPI | 96B | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
Renesas
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10µA ~ 20µA @ 2.7V ~ 5.5V | 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 ~ 5.5V | |
Analog Devices / Maxim Integrated
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100µA @ 1.71V ~ 1.89V | Binary | Alarm, Square Wave Output, Trickle-Charger, Watchdog Timer | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 10-uMAX/uSOP | Binary | Binary Counter | 1.3V ~ 3.7V | |
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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 | |
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 | 8-SOIC | HH:MM:SS (12/24 hr) | Clock/Calendar | 1.8V ~ 5.5V | |
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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25.3µA ~ 81µA @ 2V ~ 5V | YY-MM-DD-dd | Alarm, Leap Year, NVSRAM, Trickle-Charger | SPI | 96B | Surface Mount | 0°C ~ 70°C | 20-TSSOP | HH:MM:SS (12/24 hr) | Clock/Calendar | 2V ~ 5.5V | |
Analog Devices / Maxim Integrated
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125µA ~ 200µA @ 3.63V ~ 5.5V | 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 | |
Epson
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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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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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0.7µA ~ 0.8µA @ 3V ~ 5V | YY-MM-DD-dd | Alarm, Y2K | I²C, 2-Wire Serial | - | Surface Mount | -40°C ~ 85°C | 20-VSOJ | HH:MM:SS | Clock/Calendar | 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 | 14-SOP | HH:MM:SS (24 hr) | Clock/Calendar | 1.6V ~ 5.5V |
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