it's the diode's forward voltage, and you can find it in it's data sheet ..Vf is what voltage? How can we know the Vf is 1.2V?
it's a shortcut:May i know what is Vf-s?
Silicon, Power Rectifier, General Purpose.
DC forward voltage(max V):1.2(1.3 for 1N5554) @DC forward current(pk A):9.0
DC reverse current(max µA):1.0 @ DC reverse voltage (V): 200, 600, 1000
Switching time (ns): 2000; IFSM= 100 A (pk); Io= 3.0 A (t=55°C.)
Operating Temperature range (°C.): -65 to +175.
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