| Image | Part Number | Manufacturer | Description | Series | Operating Temperature | Features | Packaging | Mounting Type | RoHS Status | Manufacturer Part Number | Type | Voltage - Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PT7C433833WE | Diodes Incorporated | I2C AND LOW POWER RTC | - | - | - | Tube | Surface Mount | - | - | - | - | |
| DS1685S-5 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-SOIC | - | 0°C ~ 70°C | Alarm, NVSRAM, Square Wave Output, Y2K | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| ISL1208IU8Z-TK | Intersil | IC RTC CLK/CALENDAR I2C 8-MSOP | - | -40°C ~ 85°C | Alarm, Leap Year, SRAM | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | |
| RX-8803LC:UA3 PURE SN | Epson | IC RTC CLK/CALENDAR I2C 12-VSOJ | - | -40°C ~ 85°C | Alarm | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.6 V ~ 5.5 V | |
| DS1394U-33+T&R | Maxim Integrated | IC RTC CLK/CALENDAR SPI 10-MSOP | - | -40°C ~ 85°C | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 2.97 V ~ 5.5 V | |
| RX-8581NB:B3 | Epson | IC RTC CLK/CALENDAR I2C 22-SON | - | -40°C ~ 85°C | Alarm, Leap Year | Original-Reel® | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 5.5 V | |
| MCP795W22-I/SL | Micrel / Microchip Technology | IC RTC CLK/CALENDAR SPI 14-SOIC | - | -40°C ~ 85°C | Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID, Watchdog Timer | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 3.6 V | |
| DS1284Q/T&R | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-PLCC | - | 0°C ~ 70°C | Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS17885E-5+ | Maxim Integrated | IC RTC CLK/CALENDAR PAR 28-TSOP | - | 0°C ~ 70°C | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Tray | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | |
| DS1344E-3+ | Maxim Integrated | IC RTC CLK/CALENDAR SPI 20-TSSOP | - | -40°C ~ 85°C | Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger | 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.