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← TechnologyWhich mechanism limits reverse current flow in Zener diodes?
A)Quantum tunneling dominates breakdown✓
B)Thermionic emission initiates conduction
C)Minority carrier injection saturates quickly
D)Avalanche multiplication sharply increases current
💡 Explanation
Quantum tunneling enables Zener diodes to conduct in reverse breakdown because electrons tunnel through the depletion region rather than overcoming the potential barrier. Therefore, current stays limited to designed breakdown ratings, rather than escalating without control as in avalanche breakdown with increasing voltage.
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