Semiconductor ESD Protection with Vertical Diode and PNP Transistor
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Solution Overview
Problem
Existing semiconductor device structures face challenges in providing robust electro-static discharge (ESD) protection, particularly in power applications, with limitations in achieving low on-state resistance and high triggering voltages while maintaining a minimal footprint, and are prone to latch-up and parasitic effects due to the limitations of current snapback protection mechanisms.
Innovation Solution
A semiconductor device structure incorporating a vertical P/N diode and PNP transistor in parallel, with an N-buried layer active in the diode, allows for concurrent current flows and adjustable triggering and breakdown voltages, enabling a low snapback voltage and robust ESD protection with a reduced silicon area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snapback protection structure is used to provide ESD protection, then the device can protect against electro-static discharge, but the snapback voltage may fall below the maximum operating voltage causing direct current generation and potential destruction of the protection circuit
Solution Approach 1:
The patent modifies the electrical parameters of the protection circuit by introducing a series resistor between the ESD protection device and the protected circuit. This resistor changes the voltage-current characteristics to prevent the snapback voltage from falling below the operating voltage, thereby eliminating direct current generation and latch-up phenomena while maintaining ESD protection capability.
2Reliability
If a larger silicon area is used to reduce on-state resistance, then the ESD protection performance is improved, but the device footprint and cost increase
Solution Approach 1:
The patent introduces a series resistor as an intermediary element that mediates between the ESD protection device and the protected circuit. This intermediary allows the use of a smaller ESD protection device structure while maintaining overall protection performance, as the resistor helps regulate the current and voltage characteristics without requiring a large silicon area.
Data Source
AI summary
A semiconductor device structure comprises a plurality of vertical layers and a plurality of conductive elements wherein the vertical layers and plurality of conductive elements co-operate to function as at least two active devices in parallel. The semiconductor device structure may also comprise a plurality of horizontal conductive elements wherein the structure is arranged to support at least two concurrent current flows, such that a first current flow is across the plurality of vertical conductive elements and a second current flow is across the plurality of horizontal conductive elements.