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voltage and current regulator What Are the Causes of Blown NPN Transistors

by:KEBO      2019-10-25


The transistor acts as a current regulator, controlling the larger current flow between the collection and emitter by using the small Current introduced at the bottom.By changing the base current or base voltage, the total current or voltage difference between the collector and the emitter can be changed.This change is called "amplification factor ".

With their peers, the PNP transistor, is a type of bipolar typeA junction transmitter (BJT) consisting of three terminals of the base, collector and transmitter terminals ).The difference between PNP and PNP transistors is the direction in which the current flows between the collector and the emitter.In the case of a pnjunction transistor, it can be described as two diodes with a common anode, consisting of a halfTwo types of conductor materials, P and N.In operation, the small induction base current regulates the large emitter-to-Collector current.

It was developed in the 1940 s and quickly replaced the larger, slower, and more fragile vacuum tubes used before that.Although the transistors are very strong in comparison, they can still be damaged or destroyed if there is a problem with the electrical circuit (explosion ).Here are some ways to blow a pnjunction transistor.

Because the size of the transistor is determined based on the operating voltage of the circuit, any spike or substantial increase in the basic system voltage will cause the transistor to burst.This is because the transistor is designed as a voltage storage container with limited capacity, and when more voltage is pushed into the container, the transistor is always damaged, not designed to hold or pass.

In order to prevent the semiconductor material from overheating and breakdown, the transistor must remain cool.If the material is allowed to start decomposition due to heat, this will cause unnecessary resistance to be generated inside the transistor, thus increasing the heat load, and the possibility of damage to semiconductor materials in the transistor is inevitable.By using radiators and cooling fans, components and circuit boards must remain cool at all times.

A bipolar-Connect the transmitter to work on its best collectorThe emitter stream is either fully on or completely off.Operating anywhere between these two extremes increases the resistance of the element, and the increased resistance converts into heat in the circuit.If the part capacity is maintained to work for a long time, even if the transistor is properly cooled under normal working conditions, it will cause the transistor to overheat and fail.



The response to excessive voltage is how it responds to excessive current.Over-current may be the result of voltage spikes, base current semiconductor material breakdown, or it may occur by passing through the system by more current than designed.Short over-Current bursts can be treated as they dissipate as heat, but for a long timeduration over-The current event will be similar to the above mechanism and cause the transistor to overheat and fail.As with the over current, the current flowing in the wrong direction will also hit the pnjunction transistor.If part of the polarity of the circuit is reversed, or additional components are installed in the system, forcing the current to flow opposite the expected path, this may happen.
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