| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PT7C4337UE | Diodes Incorporated | IC RTC CLK/CALENDAR I2C MSOP | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| DS12R887-5 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 48-BGA | - | -40°C ~ 85°C | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | Tray | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| MAX6910EO33+T | Maxim Integrated | IC RTC I2C COMPAT 20-QSOP | - | - | - | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar/Supervisor | 3 V ~ 3.6 V | |
| DS1501WZ+T&R | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-SOIC | - | 0°C ~ 70°C | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 3 V ~ 3.6 V | |
| DS17487-3IND+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-EDIP | - | -40°C ~ 85°C | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Tube | Through Hole | - | - | Clock/Calendar | 2.7 V ~ 3.7 V | |
| ISL12082IB8Z-T | Intersil | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| MCP795W11T-I/SL | Micrel / Microchip Technology | IC RTC CLK/CALENDAR SPI 14-SOIC | - | -40°C ~ 85°C | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 3.6 V | |
| ISL12022MAIBZ-T | Intersil | IC RTC CLK/CALENDAR I2C 20-SOIC | - | -40°C ~ 85°C | Alarm, Daylight Savings, Leap Year, SRAM | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| 1337GDVGI8 | IDT (Integrated Device Technology) | IC RTC CLK/CALENDAR I2C 8-TSSOP | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| X1227S8I | Intersil | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 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.