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What specification describes the maximum voltage that can go into the base of a transistor?
I'm looking at a diagram that calls for transistor 2SD613. In the diagram, the voltage to the base of the transistor is 12V. When I check the spec sheet of this transistor, the Emitter-Base Voltage spec says 6.0V. I'm assuming this is either a nominal or maximum rating. Am I wrong?
1 Answer
- billrussell42Lv 71 decade agoFavorite Answer
The 6 volts is reverse biased, with emitter positive with respect to base. In normal operation, the base is forward biased, and the emitter is negative with respect to the base.
If the base is at 12 volts, the emitter is at about 11.4 volts, or the transistor is toast. The maximum forward bias, base to emitter, you can put on a transistor is about 0.6 to 0.8 volts.
The reason the forward voltage is not specified, is that the base current is the important factor, not the forward base voltage.
email me if this is unclear.
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