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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1643P-70 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 34-PCM | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| DS12887A+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-EDIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| DS1306E | Maxim Integrated | IC RTC CLK/CALENDAR SPI 20-TSSOP | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | - | |
| PCF8583BS,518 | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR I2C 20-VQFN | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.5 V ~ 6 V | - | |
| DS1556W-120+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 32-EDIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | - | |
| PCF8564ACX9/B/1,02 | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR I2C DIE | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1 V ~ 5.5 V | - | |
| DS12885S/T&R | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-SOIC | - | 0°C ~ 70°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| AB0811-T3 | Abracon Corporation | IC RTC CLK/CALENDAR SPI 16-QFN | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.7 V ~ 3.6 V | - | |
| DS1251YP-70IND | Maxim Integrated | IC SRAM W/RTC 4MEG 70NS 34-PCM | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Phantom Time Chip | 4.5 V ~ 5.5 V | - | |
| BQ3285LDSSTRG4 | N/A | IC RTC CLK/CALENDAR PAR 24-QSOP | - | 0°C ~ 70°C | Tape & Reel (TR) | 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.