measuring icex transistors
smith123,
For a bipolar transistor, it is essentially the collector current that flows with no base drive current supplied.
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Icbo is the collector current that flows with the base open
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Iceo is the collector current that flows with the emitter open
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Icer is the collector current that flows with a specified resistance connected from base to emitter
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Icex is the collector current that flows with a specified revrse bias voltage applied between base and emitter.
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Ice(sus) is the collector current that flows at a specified Vce when the collector-emitter diode breaks down (Avalanche mode).
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Icer, Icex, Ic(sus) ratings are not used much anymore.
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For a FET it is the gate current