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2023-11-20 16:04
Electrostatic breakdown is generally divided into two types:
One is voltage type, which means that the thin oxide layer of the gate undergoes breakdown, forming pinholes, causing a short circuit between the gate and source, or a short circuit between the gate and drain;
The second is power type, which means that the metallized thin film aluminum strip is blown, causing an open gate or source circuit.
2、 What are the reasons and solutions for MOS transistor breakdown?
Firstly, the input resistance of the MOS transistor itself is very high, and the capacitance between the gate and source electrodes is very small, so it is highly susceptible to external electromagnetic fields or static electricity induction and electrification. A small amount of charge can form a relatively high voltage (U=Q/C) on the capacitance between the electrodes, causing damage to the transistor.
Although MOS input terminals have anti-static protection measures, they still need to be treated with caution. It is best to use metal containers or conductive materials for packaging during storage and transportation, and do not place them in chemical materials or chemical fiber fabrics that are prone to generating static electricity and high voltage.
During assembly and debugging, tools, instruments, workbenches, etc. should be well grounded. To prevent damage caused by static interference from operators, it is not advisable to wear nylon or chemical fiber clothing. It is best to ground hands or tools before touching the integrated block. When straightening, bending, or manually welding device leads, the equipment used must be well grounded.
Secondly, the protection diode at the input end of the MOS circuit has a current tolerance of 1mA when conducting. When there is a possibility of excessive transient input current (exceeding 10mA), the input protection resistor should be connected in series. Therefore, a MOS transistor with an internal protective resistor can be selected for application.
Furthermore, due to the limited instantaneous energy absorbed by the protection circuit, too large an instantaneous signal and too high an electrostatic voltage will render the protection circuit ineffective. So during welding, the electric soldering iron must be reliably grounded to prevent electric leakage from penetrating the input end of the device. Generally, when in use, the residual heat of the soldering iron can be used for welding after the power is cut off, and the grounding pin can be welded first.
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