The know-how to inspect Schottky diodes

A Schottky diode is a device that acts as a one-way switch at both ends. Schottky is a metal-semiconductor diode known for its extremely low forward voltage, in which the metal forms the anode and the N-type semiconductor acts as the cathode. Today I will teach you how to test SCHOTT

Methods of base diodes:

1. Distinguish between positive and negative electrodes: Observe the symbol markings on the housing. The housing of a Schottky diode is usually marked with the symbol of the Schottky diode, with a triangular arrow at one end as a positive pole and a negative end at the other. Detects the highest reverse breakdown voltage. In the case of alternating current, because it is constantly changing, the highest reverse operating voltage is the peak AC voltage that the Schottky diode is subjected to.

2. Detect the bidirectional Schottky diode: Place the multimeter in the corresponding DC voltage stop. The test voltage is provided by a megohmmeter. During the test, shake the megohmmeter to measure the VBR value in the same way. Finally, VBO and VBR are compared, and the smaller the difference between the absolute values of the two, the better the symmetry of the tested bidirectional trigger Schottky diode.

3. Detection of high-frequency varistor Schottky diode: identify the difference between positive and negative high-frequency varistor Schottky diode and ordinary diode in appearance is that its color code color is different, the color code color of ordinary diode is generally black, and the color code color of high-frequency varistor Schottky diode is light color. Its polarity law is similar to that of ordinary diodes, that is, one end with a green ring is the negative electrode, and the other end without a green ring is the positive electrode.

4. Detection of varactor Schottky diode: how to measure the red and black pen of the multimeter, the resistance value between the two pins of the varactor Schottky diode should be infinity. If the multimeter pointer swings slightly to the right or the resistance value is zero during the measurement, it means that the measured variable-capacitating Schottky diode has a leakage fault or has been broken down.