Diodes are PN junction semiconductor user for AC to DC filtering and signal processing, voltage regulator etc. Do diodes explode? I have the same question in my mind. The answer is Yes in most of the cases. The Diodes don’t “explode” in the normal situations, but they will release heat, smoke, and potentially small debris in the situation of excessive current or voltage passing through it. This will leads to overheating and damage of diodes.
How can a Diode Be Damaged?
Overcurrent Passing through Diodes
The diodes has its own properties and current, voltage rating. If a diode is forced to conduct a current more than its rated capacity leads to overheat and failure occurs. This will potentially causing a short circuit or open circuit.
Applying Overvoltage
Based on over current it gets damaged, the same way voltage is also important. Connecting high voltage exceeding its reverse breakdown voltage, will fail the diode to work properly. This will leads to a short circuit and damages the other components connect to it.
Thermal Effects
The Diodes are designed with semiconductor materials. The semiconductor material inside the diode generates heat when current flows through it. In high current passing condition diode is not properly cooled can cause the diode to overheat and fail.
How can we Identify the Diode is Failed
A failed diode will shows several behavior’s such as Short circuit, open circuit and internal damages. In short circuit behavior, the diodes showing continuity in forward bias and reverse bias condition. This means the diode is damaged and you need to replace it. In open circuit either the directions the diodes will not conduct and it will be as an open circuit.
Safety precaution when working with diodes
It is important to use diodes with appropriate current and voltage ratings for the circuit. you needs to verify that the metal diodes has an adequate heat sink fixed on it to dissipate a lot of heat. Use a current limiting resistors or fuse to protect the damage of other components.
