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Sep 02, 2002 · Obviously we need to change this if we are trying to accurately model a Zener diode. There are two parameters that need to be set to model the Zener breakdown region: BV is the breakdown voltage and IBV is current at the breakdown voltage. To model an 8 V Zener diode, typical values for these parameters might be: BV = 8 V. IBV = 20 mA