| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1553-70 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-EDIP | - | 0°C ~ 70°C | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| PCF2127T/2Y | NXP Semiconductors / Freescale | IC RTC CLK/CAL I2C/SPI 16-SOIC | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 4.2 V | |
| ISL12028IV27AZ | Intersil | IC RTC CLK/CALENDAR I2C 14-TSSOP | - | -40°C ~ 85°C | Alarm, Leap Year, Supervisor, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| DS1556WP-120+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 34-PCM | - | 0°C ~ 70°C | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Tube | Surface Mount | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | |
| DS1306E/T&R | Maxim Integrated | IC RTC CLK/CALENDAR SPI 20-TSSOP | - | -40°C ~ 85°C | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | |
| DS1251WP-120+C01 | Maxim Integrated | IC NVSRAM 34PWRCP | - | 0°C ~ 70°C | Leap Year, NVSRAM | Tube | Surface Mount | - | - | Phantom Time Chip | 2.97 V ~ 3.63 V | |
| DS12885S | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-SOIC | - | 0°C ~ 70°C | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| RTC-72423A:3:ROHS | Epson | IC RTC CLK/CALENDAR PAR 24-SOP | - | -40°C ~ 85°C | Leap Year | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| RX6110SA:BB PURE SN | Epson | IC TRC CLK/CALENDAR | - | - | - | - | - | - | - | - | - | |
| M48T02-150PC1 | STMicroelectronics | IC RTC CLK/CALENDAR PAR 24DIP | Timekeeper® | 0°C ~ 70°C | Leap Year | Tube | Through Hole | - | - | Clock/Calendar | 4.75 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.