| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M41T81SM6F | STMicroelectronics | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, Watchdog Timer | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| RX-4574LC:B3 PURE SN | Epson | IC RTC CLK/CALENDAR SER 12-VSOJ | - | -40°C ~ 85°C | Alarm, Leap Year | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.6 V ~ 5.5 V | |
| DS1339C-2# | Maxim Integrated | IC RTC CLK/CALENDAR I2C 16-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| M41T81M6F | STMicroelectronics | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, Watchdog Timer | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | |
| DS1693 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-EDIP | - | 0°C ~ 70°C | NVSRAM | Tube | Through Hole | - | - | Clock/Calendar | 2.7 V ~ 3.3 V, 4.5 V ~ 5.5 V | |
| X1288V14Z-4.5AT1 | Intersil | IC RTC CLK/CALENDAR I2C 14-TSSOP | - | 0°C ~ 70°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| BQ4802LYPW | N/A | IC RTC CLK/CALENDAR PAR 28-TSSOP | - | 0°C ~ 70°C | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 3.6 V | |
| 1339-31DCGI8 | IDT (Integrated Device Technology) | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 3.3 V ~ 5.5 V | |
| ISL12059IBZ-T | Intersil | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Leap Year | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 3.6 V | |
| X1228S14 | Intersil | IC RTC CLK/CALENDAR I2C 14-SOIC | - | 0°C ~ 70°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V |
Real-time clocks (RTCs) are electronic devices that keep track of the current time and date with high accuracy, independent of external power sources. They typically include a built-in crystal oscillator and a battery backup to ensure continuous timekeeping even when the main power is off. RTCs are commonly used in applications such as consumer electronics, industrial automation, medical devices, and automotive systems where precise timekeeping is essential for scheduling tasks, logging events, and time-stamping data.