| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCF8593T/1,112 | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Alarm, NVSRAM | Tube | Surface Mount | - | - | Clock/Calendar | 2.5 V ~ 6 V | |
| RX8900CE:UB0 | Epson | IC TRC CLK/CALENDAR | - | - | - | - | - | RoHS Compliant | - | - | - | |
| DS3234S#T&R | Maxim Integrated | IC RTC CLK/CALENDAR SPI 20-SOIC | - | 0°C ~ 70°C | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | |
| DS1678 | Maxim Integrated | IC RTC EVENT REC I2C 8-DIP | - | -40°C ~ 85°C | Alarm, Leap Year, NVSRAM, Y2K | Tube | Through Hole | - | - | Time Event Recorder | 4.5 V ~ 5.5 V | |
| DS1374C-33# | Maxim Integrated | IC RTC BINARY CNT I2C 16-SOIC | - | -40°C ~ 85°C | Alarm, Square Wave Output, Trickle-Charger, Watchdog Timer | Tube | Surface Mount | - | - | Binary Counter | 2.97 V ~ 5.5 V | |
| X1288V14 | Intersil | IC RTC CLK/CALENDAR I2C 14-TSSOP | - | 0°C ~ 70°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1501Y | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-DIP | - | 0°C ~ 70°C | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1685-5+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-DIP | - | 0°C ~ 70°C | Alarm, NVSRAM, Square Wave Output, Y2K | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1248WP-120IND | Maxim Integrated | IC RTC PHANTOM PAR 34-PCM | - | -40°C ~ 85°C | NVSRAM | Tube | Surface Mount | - | - | Phantom Time Chip | 2.97 V ~ 3.63 V | |
| M41T93SQA6F | STMicroelectronics | IC RTC CLK/CALENDAR SPI 16-QFN | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 3 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.