Table of Contents
What can damage a transistor?
Sometimes external causes may damage or even destroy transistors. Bad handling of FETs can lead to damage by electrostatic discharge. Sometimes this will result in a transistor (or a circuit board) not working when fitted within a system.
What are the causes of defects in transistor?
Common transistor failure modes are shorted base-emitter junction, shorted base-collector junction, shorted collector emitter, open collector-emitter, open base-emitter junction or open base-collector junction.
How do output transistors fail?
As temperature rises in transistors (and virtually any other electronic device), they are less able to withstand stress. Under adverse conditions, they are more likely to fail when hot. All else being constant, lowering the impedance of the load on the amplifier will cause the output current to increase.
How do you know when a transistor is bad?
A bad transistor can sometimes be detected by its partly burned or distorted appearance, but more often there is no visible indication. One approach to troubleshooting is to substitute a known good component, but that is a costly way to go.
How do you know a transistor is bad?
How do you test a bad transistor?
Hook the positive lead from the multimeter to the to the BASE (B) of the transistor. Hook the negative meter lead to the EMITTER (E) of the transistor. For an good NPN transistor, the meter should show a voltage drop between 0.45V and 0.9V. If you are testing PNP transistor, you should see “OL” (Over Limit).
How do you test for a bad transistor?
How many pn junction available in a transistor?
two PN junctions
The Transistor is a three terminal solid state device which is formed by connecting two diodes back to back. Hence it has got two PN junctions.
What are the basic functions of a transistor?
A transistor is a kind of solid semiconductor device, which has many functions, such as detecting, rectifying, amplifying, switching, voltage stabilizing, signal modulating and so on. As a variable current switch, the transistor can control the output current based on the input voltage.