Patent ID: 7893486
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A field plate trench transistor having a semiconductor body comprising: a trench structure; an electrode structure embedded in the trench structure, the electrode structure being electrically insulated from the semiconductor body by an insulation structure and having a gate electrode structure and a field electrode structure arranged below and/or alongside the gate electrode structure and electrically insulated from the latter; and a voltage divider which is integrated into the field electrode structure or provided within the mesa zones (adjoining trenches containing field plates), the voltage divider being configured such that the field electrode structure is set to a potential lying between source and drain potentials and/or gate and drain potentials, wherein the voltage divider is realized as a series circuit comprising a resistor and a Zener diode, the resistor being connected between source potential and the field electrode structure, and the Zener diode being forward-biased between the field electrode structure and drain potential.