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3

It means the components are drawn in the schematic and there are places reserved for them on the board, but during board manufacture these components are not assembled on the board. So they are not needed for basic functionality but if someone wants to try out a feature such as the RTC clock crystal it can be soldered there for experimenting and prototyping ...


2

It is quite common to have components which are not populated on a PCB during manufacturing. They may be omitted for several reasons: The design does not require the component but it could be added later for various reasons including noise immunity, stability, performance, tuning, etc. This is common in prototyping and early product versions. The schematic ...


3

Typically the SOA for shorter pulses does not increase the maximum current but increases the limits at higher Vce. Curve from here So I suspect you're more than okay. This (obsolete) transistor is designed for audio so it's not characterized at very short pulse widths. Of course if it's a high reliability application or there is possibility of damage you ...


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