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| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply | Shell Style |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1643-100 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-EDIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| MCP795B21T-I/ST | Micrel / Microchip Technology | IC RTC CLK/CALENDAR SPI 14-TSSOP | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | - | |
| DS1315-33+ | Maxim Integrated | IC RTC PHANTOM PAR 16-DIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Phantom Time Chip | 3 V ~ 3.6 V | - | |
| M41T11MH6F | STMicroelectronics | IC RTC CLK/CALENDAR I2C 28-SOIC | - | -40°C ~ 85°C | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | - | |
| M48T18-100PC1 | STMicroelectronics | IC RTC CLK/CALENDAR PAR 28DIP | Timekeeper® | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| BQ4847YMT | N/A | IC RTC CLK/CALENDAR PAR 28-DIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| RTC-4543SA:A0 ROHS | Epson | IC RTC CLK/CALENDAR SER 14-SOIC | - | -40°C ~ 85°C | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2.5 V ~ 5.5 V | - | |
| DS1393U-33+ | Maxim Integrated | IC RTC CLK/CALENDAR SER 10-USOP | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.97 V ~ 5.5 V | - | |
| 1339AC-31SRGI | IDT (Integrated Device Technology) | IC RTC CLK/CALENDAR I2C 16-SOIC | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | - | |
| ISL12028IV27Z | Intersil | IC RTC CLK/CALENDAR I2C 14-TSSOP | - | -40°C ~ 85°C | 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.