Small−Signal Current Gain ( hfe) Min Max (IC = 1.0 mAdc, VCE = 10 Vdc, f = 1.0 kHz) 50 300(IC = 10 mAdc, VCE = 10 Vdc, f = 1.0 kHz) 75 375
...Allow voltage to travel from the collector to the emitter. Does the voltage that I'd like to pass through the collector and emitter need to be specific or can there be a range(possible between 5VDC and 24VDC)?
6. Calculate BASE RESISTOR ! VDRIVE = 5V COLLECTOR CURRENT (IC) = 1A hfe 350 IBASE = IC/hfe♦ IBASE = 1A/350 IBASE = 0.00285A (2.85mA) Base−Emitter Saturation Voltage = 0.6V VRESISTOR = VDRIVE - Base−Emitter Saturation Voltage = 5V-0.6V = 4.4V Rbase = VRESISTOR/ IBASE = 4.4V/0.00285A = 1543.8 (ROUND DOWN TO 1000 Ohms (1k) for better saturation RBASE = 1k ohm