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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PT7C4337BWEX | Texas Instruments | REAL TIME CLOCK SO-8 T&R 2.5K | - | - | - | - | - | - | - | - | - | |
| DS1670S+ | Maxim Integrated | IC RTC SYSTEM CTRLR SER 20-SOIC | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Portable System Controller | 2.97 V ~ 3.63 V | - | |
| RTC-4553A2 | Epson | IC RTC CLK/CALENDAR SER 14-SOIC | - | -30°C ~ 70°C | Tape & Reel (TR) | Surface Mount | - | - | Clock/Calendar | 2.7 V ~ 5.5 V | - | |
| DS1553WP-150 | Maxim Integrated | IC RTC CLK/CALENDAR PAR 34-PCM | - | 0°C ~ 70°C | Tube | Surface Mount | - | - | Clock/Calendar | 2.97 V ~ 3.63 V | - | |
| MCP79520-I/MS | Micrel / Microchip Technology | IC RTC CLK/CALENDAR SPI 10-MSOP | - | -40°C ~ 85°C | Tube | Surface Mount | - | - | Clock/Calendar | 1.8 V ~ 3.6 V | - | |
| RX-8801SA:UB3 PURE SN | Epson | IC RTC CLK/CALENDAR I2C 14-SOP | - | -40°C ~ 85°C | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 1.6 V ~ 5.5 V | - | |
| RX-4035LC:BB PURE SN | Epson | IC TRC CLK/CALENDAR | - | - | - | - | - | - | - | - | - | |
| PCF2123TS/1,118 | NXP Semiconductors / Freescale | IC RTC CLK/CALENDAR SPI 14-TSSOP | - | -40°C ~ 85°C | Cut Tape (CT) | Surface Mount | - | - | Clock/Calendar | 1.6 V ~ 5.5 V | - | |
| RX-8803SA:UB PURE SN | Epson | IC TRC CLK/CALENDAR | - | - | - | - | - | - | - | - | - | |
| M41T93RMY6E | STMicroelectronics | IC RTC CLK/CALENDAR SPI 18-SOX | - | -40°C ~ 85°C | 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.