The DS3231SN is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping.
The 2SC458 is a 30V 100mA NPN (BJT) manufactured in a plastic TO92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are from left to right the emitter, collector, and base leads.
The HA17741/PS is an internal phase compensation high-performance operational amplifier, that is appropriate for use in a wide range of applications in the test and control fields chips DIP-8 Pins Package.
The Type-C USB Charging Discharging Boost Module is a DC-5V 2A, This is a high precision DC5V 2A Charge Discharge Integrated Module Type-C Input compatible with 4.2v/4.35v Lithium Batteries.