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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCF85363ATL/AX | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR I2C 10DFN | - | -40°C ~ 85°C | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 0.9 V ~ 5.5 V | - | |
| DS1501WN | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-DIP | - | -40°C ~ 85°C | Tube | Through Hole | - | - | Clock/Calendar | 3 V ~ 3.6 V | - | |
| BQ4802YDSH | N/A | IC RTC CLK/CALENDAR PAR 28-SOP | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| 1337AGDVGI | IDT (Integrated Device Technology) | IC RTC CLK/CALENDAR I2C 8-TSSOP | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | - | |
| 1338-31DCGI | IDT (Integrated Device Technology) | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 3.3 V ~ 5.5 V | - | |
| DS1390U-33+T&R | Maxim Integrated | IC RTC CLK/CALENDAR SPI 10-USOP | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.97 V ~ 5.5 V | - | |
| DS1248WP-120+ | Maxim Integrated | IC RTC PHANTOM PAR 34-PCM | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Phantom Time Chip | 2.97 V ~ 3.63 V | - | |
| RX-8581JE:B0 | Epson | IC RTC CLK/CALENDAR I2C 20-VSOJ | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | - | |
| DS1307ZN+ | Maxim Integrated | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| DS1554-70+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 32-EDIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | 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.