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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCF2123BS/1,518 | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR SPI 16-HVQFN | - | -40°C ~ 85°C | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 1.6 V ~ 5.5 V | - | |
| DS1391U-3+T&R | Maxim Integrated | IC RTC CLK/CALENDAR SPI 10-USOP | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 3.3 V | - | |
| DS1673S-5 | Maxim Integrated | IC RTC SYSTEM CTRLR SER 20-SOIC | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Portable System Controller | 4.5 V ~ 5.5 V | - | |
| ISL1219IUZ | Intersil | IC RTC EVENT REC I2C 10-MSOP | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Time Event Recorder | 2.7 V ~ 5.5 V | - | |
| DS1615S/T&R | Maxim Integrated | IC RTC TEMP REC SER 16-SOIC | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Temperature Recorder | 4 V ~ 5.5 V | - | |
| DS1556WP-120IND | Maxim Integrated | IC RTC CLK/CALENDAR PAR 34-PCM | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | - | |
| DS17885S-3+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-SOIC | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 3.7 V | - | |
| DS1315EN-33+T&R | Maxim Integrated | IC RTC PHANTOM PAR 20-TSSOP | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Phantom Time Chip | 3 V ~ 3.6 V | - | |
| M41T93ZQA6F | STMicroelectronics | IC RTC CLK/CALENDAR SPI 16-QFN | - | -40°C ~ 85°C | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2.38 V ~ 5.5 V | - | |
| X1228S14I-4.5A | Intersil | IC RTC CLK/CALENDAR I2C 14-SOIC | - | -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.