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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes ## Operation ## Forward and Reverse Bias ## Diode Characteristics ## Worksheet: Diode Characteristics ## Zener Diodes ## Examples: Zener Diodes ## Worksheet: Zener Diodes ## Light Emitting Diodes * Transistors * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits * Operational Amplifier Circuits * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
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Diode Characteristics<^< Forward and Reverse Bias | Course Index | Worksheet: Diode Characteristics >^>(:nl:)  '''Graph showing diode characteristics''' An 'ideal' diode would conduct perfectly in the forward direction and act as a perfect insulator in the reverse direction. Real diodes (made from silicon or germanium) are somewhat less perfect as they exhibit ohmic resistance in both the forward and reverse directions. In addition, the forward threshold voltage for a silicon diode is approximately 0.65V whilst that for a germanium diode is approximately 0.2V. The reverse breakdown voltage is usually very much higher than the forward threshold voltage - for example, a typical general-purpose diode might have a forward threshold voltage of 0.65V and a reverse breakdown voltage of 200V. If this latter voltage is exceeded, the diode may suffer irreversible damage. The characteristics for silicon diodes make them ideally suited for use as rectifiers and switches whilst lower voltage germanium types are better suited to small signal applications. (:nl:)(:table style="clear:both":)
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