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If we take a Common Base configured transistor in to consideration..Will the collector base junction break if we apply high voltage of like 7volts?if it breaks then does it give large current

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It depends on the transistor. Look in its datasheet for a specification called "Vcbo", which stands for "maximum Voltage, collector-to-base, emitter open".

If you exceed this value, the transistor may or may not be damaged, depending on how much current you allow to flow — i.e., how much power the transistor disspates while the current is flowing. Generally speaking, it is the temperature rise from this heating that produces permanent damage.

Sometimes, a transistor is deliberately operated in reverse-breakdown mode, although the more heavily-doped base-emiiter junction is usually used. For example, a transistor operating in its Zener breakdown region makes a pretty good wideband noise source for some applications.

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  • \$\begingroup\$ Some RF/highfreq MicroT devices from Motorola, with 5GHz Ftau, had only 5 volts Vce rating. \$\endgroup\$ Commented Sep 27, 2018 at 4:44

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