Here we have shown a basic chart on different types of Diodes, their symbol, application and functions. This topic is very much important for not only semester but also competitive exam.
| Sl. No. | Diode | Symbol | Application | Remarks |
| 1. | PN Junction Diode |  | Rectifier Circuit | Basic Diode |
| 2. | Zener Diode |  | Voltage stabilizer & regulator | To maintain fixed voltage, Voltage control Diode, works in reverse bias |
| 3. | Avalance Diode |  | Surge Protection | High voltage breakdown Diode |
| 4. | LED (Light Emitting Diode) |  | Indicator, Display, Lighting | Converts electrical energy into light energy |
| 5. | Photo-diode |  | Solar panel, Sensor, IR detection | To detect light |
| 6. | Schottky Diode |  | High speed switching circuit, SMPS | Fast switching Diode |
| 7. | Tunnel Diode |  | Oscillator, HF Circuit | Very fast Diode, Have -ve resistance region |
| 8. | Varactor Diode (Varicap Diode) |  | RF Tuning, TV, Radio | Changes capacitance as per voltage |
| 9. | PIN Diode |  | RF Switch, Attenuator, High Frequency application | P-I-N (P region – Intrinsic region – N region) structure |
| 10. | LASER Diode |  | Used in Optical communication, CD/DVD drive, Fibre optics | Produce LASER (Light Amplification by Stimulated Emission of Radiation) |
| 11. | TVS Diode (Transient Voltage Suppression) |  Bi-directional type | Used in Lightning/ESD protection | A Protection Diode, Protect from sudden voltage spike (surge) |
| 12. | Step Recovery Diode |  | Used in Frequency Multiplier Circuit | Generate pulses |
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