The DS1343E-3+T&R: The 0.65 mm pin pitch is breadboard-friendly with a SOIC-20 adapter; no need for a hot-air station.
Timekeeping and memory features
This SPI RTC tracks time in HH:MM:SS (12/24 hr) and date in YY-MM-DD-dd format, with automatic leap-year correction through 2099. The 96 bytes of NVRAM are handy for storing calibration constants or event logs without an external EEPROM. Built-in alarm and square-wave output let the chip wake a sleeping microcontroller or generate a periodic interrupt — useful for data-logging or scheduled sensor reads.
