| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1501YEN+T&R | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-TSOP | - | -40°C ~ 85°C | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| AB-RTCMC-32.768KHZ-B5ZE-S3-T | Abracon Corporation | IC RTC CLK/CALENDAR I2C MODULE | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.2 V ~ 5.5 V | |
| DS1743-70 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-EDIP | - | 0°C ~ 70°C | Leap Year, NVSRAM, Y2K | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1347T+T&R | Maxim Integrated | IC RTC CLK/CALENDAR SPI 8-TDFN | - | -40°C ~ 85°C | Alarm, Leap Year, SRAM | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | |
| MCP79410-I/MS | Micrel / Microchip Technology | IC RTC CLK/CALENDAR I2C 8-MSOP | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| X1227S8-4.5A | Intersil | IC RTC CLK/CALENDAR I2C 8-SOIC | - | 0°C ~ 70°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1340Z-3 | Maxim Integrated | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Leap Year, Trickle-Charger | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| DS1315E-33+ | Maxim Integrated | IC RTC PHANTOM PAR 20-TSSOP | - | 0°C ~ 70°C | Leap Year | Tube | Surface Mount | - | - | Phantom Time Chip | 3 V ~ 3.6 V | |
| RX8900CE:UB3 | Epson | IC TRC CLK/CALENDAR | - | - | - | - | - | RoHS Compliant | - | - | - | |
| X1228S14Z-2.7A | 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.