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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DS1742W-150 | Maxim Integrated | IC RTC RAM Y2K 3.3V 150NS 24EDIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | - | |
| X1227S8Z-2.7A | Intersil | IC RTC CLK/CALENDAR I2C 8-SOIC | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | - | |
| DS1386P-8-120 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 34-PCM | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| DS1642-100 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 24-EDIP | - | 0°C ~ 70°C | Tube | Through Hole | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| M48T35Y-70MH6E | STMicroelectronics | IC RTC CLK/CALENDAR PAR 28SOH | Timekeeper® | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 4.5 V ~ 5.5 V | - | |
| ISL12029IB27Z | Intersil | IC RTC CLK/CALENDAR I2C 14-SOIC | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | - | |
| ISL12028IBZ-T | Intersil | IC RTC CLK/CALENDAR I2C 14-SOIC | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | - | |
| ISL1218IUZ-T | Intersil | IC RTC CLK/CALENDAR I2C 8-MSOP | - | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | - | |
| RA-4574SA:B3 ROHS | Epson | IC RTC CLK/CALENDAR SER 14-SOP | Automotive, AEC-Q200 | -40°C ~ 85°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 1.6 V ~ 5.5 V | - | |
| PCF2129AT/1,512 | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR I2C 20-SOIC | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 4.2 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.