no,we cant use transistor by combination of two diodes because we will come across a condition called current hogging.it means large amount of current flows through the device,diode can just rectify the signal but not amplifies it.
Transistors however, can be used as diodes.
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What is the equivalent component to use in place sl100 transistor? ...
yes.
Transistor will be in OFF mode.
relatively large propagation delay.
The transistor acts like a normal pn diode. in NPN transistor the both n i.e.,collector and emitter ane shorted then they become a n and other is p so pn diode is formed. When the emitter and the collector of a transistor are short, the emitter current =the collector current.