Manufacturing of diode semiconductor materials for SMB/SMC/SMA series

Point contact diode

The PN junction of point-contact diode has a small contact area and can not pass through a large forward current and withstand a high reverse voltage, but its high frequency performance is good, and it is suitable for use in high frequency detection circuits and switching circuits.

Surface contact diode

The PN junction of the surface contact diode has a large contact area, which can pass through a larger current and withstand a higher reverse voltage, and is suitable for use in the rectifier circuit.

Planar diode

When planar diode is used as switching tube in pulse digital circuit, the PN junction area is small, and when it is used for high-power rectifier, the PN junction area is large.

Voltage regulator tube

Voltage regulator is a special surface contact type semiconductor silicon diode, which has the function of stabilizing voltage. The main difference between the regulator and the ordinary diode is that the regulator is operating in the reverse breakdown state of the PN junction. By limiting the size of the reverse current during the manufacturing process and use, it can ensure that the regulator will not be damaged by overheating in the reverse breakdown state.

The voltage regulator is different from the general diode, its reverse breakdown is reversible, as long as it does not exceed the allowable value of the voltage regulator current, the PN junction will not be overheated and damaged, when the external reverse voltage is removed, the voltage regulator restores the original performance, so the voltage regulator has good repeat breakdown characteristics.

photodiode

Photodiode is also known as photosensitive diode. It has a glass window in the shell for easy access to light. Its characteristic is that when the light shines on its PN junction, free electrons and holes can be generated in pairs, so that the concentration of a few carriers in the semiconductor is increased, and the reverse current is increased under the action of a certain reverse bias voltage. Therefore, its reverse current increases linearly with the increase of light intensity.

When there is no light, the voltammetry characteristics of the photodiode are the same as those of ordinary diodes. Photodiode as a light control element can be used in various object detection, photoelectric control, automatic alarm and so on. When large area photodiodes are made, they can be used as an energy source and called photocells. At this time, it does not need an external power supply, and can directly convert light energy into electricity.

Light-emitting diode

Light-emitting Diode is a semiconductor solid display device that converts electrical energy directly into Light energy, referred to as LED(Light Emitting Diode). Similar to ordinary diodes, leds are also made of a PN structure. The PN junction of the LED is encapsulated in a transparent plastic shell, and the shape is square, rectangular and circular. Led drive low voltage, low working current, with strong vibration and shock resistance, small size, high reliability, power consumption and long life and other advantages, widely used in signal indicating circuits.

Commonly used in electronic technology, digital tubes, light-emitting diodes have the opposite principle to photodiodes. When the LED is forward-biased through the current, it emits light, which is the result of the energy released when the electron is directly recombined with the hole. Its spectral range is relatively narrow, and its wavelength depends on the basic material used.