| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1672S-3+ | Maxim Integrated | IC RTC BINARY CNT I2C 8-SOIC | - | -40°C ~ 85°C | Trickle-Charger | Tube | Surface Mount | - | - | Binary Counter | 2.7 V ~ 3.3 V | |
| DS1251YP-70IND+ | Maxim Integrated | IC RTC PHANTOM PAR 34-PCM | - | -40°C ~ 85°C | Leap Year, NVSRAM | Tube | Surface Mount | - | - | Phantom Time Chip | 4.5 V ~ 5.5 V | |
| DS1393U-18+T&R | Maxim Integrated | IC RTC CLK/CALENDAR SER 10-USOP | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.71 V ~ 1.89 V | |
| DS1670E | Maxim Integrated | IC RTC SYSTEM CTRLR SER 20-TSSOP | - | 0°C ~ 70°C | Alarm, Leap Year, Watchdog Timer | Tube | Surface Mount | - | - | Portable System Controller | 2.97 V ~ 3.63 V | |
| DS17887-3 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-EDIP | - | 0°C ~ 70°C | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Tube | Through Hole | - | - | Clock/Calendar | 2.7 V ~ 3.7 V | |
| MCP795B10-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 | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| ISL12028IV27Z-T | Intersil | IC RTC CLK/CALENDAR I2C 14-TSSOP | - | -40°C ~ 85°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| DS1744W-120 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-EDIP | - | 0°C ~ 70°C | Leap Year, NVSRAM, Y2K | Tube | Through Hole | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | |
| 1337AGDCGI | IDT (Integrated Device Technology) | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| DS1685Q-5/T&R | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-PLCC | - | 0°C ~ 70°C | Alarm, NVSRAM, Square Wave Output, Y2K | Tape & Reel (TR) | 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.