| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1388Z-3+ | Maxim Integrated | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 3.3 V | |
| DS14285SN+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-SOIC | - | -40°C ~ 85°C | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| BQ3285ESTR | N/A | IC RTC CLK/CALENDAR PAR 24-SOIC | - | 0°C ~ 70°C | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1647-120 | Maxim Integrated | IC RAM TIMEKEEP NV 120NS 32-EDIP | - | 0°C ~ 70°C | Leap Year, NVSRAM | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1302Z+T&R/C07 | Maxim Integrated | IC RTC CLK/CALENDAR SER 8-SOIC | - | 0°C ~ 70°C | Leap Year, NVSRAM, Trickle-Charger | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2 V ~ 5.5 V | |
| DS1501WS | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-SOIC | - | 0°C ~ 70°C | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Tube | Surface Mount | - | - | Clock/Calendar | 3 V ~ 3.6 V | |
| BQ4845S-A4NTR | N/A | IC RTC CLK/CALENDAR PAR 28-SOIC | - | -40°C ~ 85°C | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.75 V ~ 5.5 V | |
| M48T37V-10MH1F | STMicroelectronics | IC RTC CLK/CALENDAR PAR 44-SOH | Timekeeper® | 0°C ~ 70°C | Alarm, Leap Year, Watchdog Timer | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 3 V ~ 3.6 V | |
| DS1747W-120 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 32-EDIP | - | 0°C ~ 70°C | Leap Year, NVSRAM, Y2K | Tube | Through Hole | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | |
| DS1307ZN | Maxim Integrated | IC RTC CLK/CALENDAR I2C 8-SOIC | - | -40°C ~ 85°C | Leap Year, NVSRAM, Square Wave Output | Tube | Surface Mount | - | - | 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.