Judgment Method of Triode Pin

Fast recovery triode

Quickly restore the function of triode. It is a high-frequency tube. It is useful for RF and signal processing.

Difference between fast recovery triode and diode

Triode is a kind of control element, which is mainly used to control the current.

Fast recovery diode (FRD) is a semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in switching power supply, PWM pulse width modulator, frequency converter and other electronic circuits.

Diode, also known as crystal diode, referred to as diode; It is an electronic component that transmits current in only one direction. It is a device with two terminals joined by one part number. It has the property of making the current flow or not flow according to the direction of applied voltage. The crystal diode is a p-n junction formed by p-type semiconductor and n-type semiconductor. A space charge layer is formed on both sides of its interface, and a self built electric field is built. When there is no applied voltage, the diffusion current caused by the carrier concentration difference on both sides of the p-n junction is equal to the drift current caused by the self built electric field.

Triode, the full name should be semiconductor triode, also known as bipolar transistor and crystal triode. It is a semiconductor device for current control. Its function is to amplify weak signals into electrical signals with large amplitude. It is also used as a contactless switch. Crystal triode is one of the basic components of semiconductor. It has the function of current amplification and is the core component of electronic circuit. Triode is to make two PN junctions close to each other on a semiconductor substrate. The two PN junctions divide the whole semiconductor into three parts. The middle part is the base area, and the two sides are the emission area and collector area. The arrangement modes are PNP and NPN.

First, judge base B. Connect the multimeter to the three poles of the triode at one time, and contact the other two poles with the black probe. When the resistance value of the pole connected with the red probe and the other two poles contacted with the black probe is small, the pole connected with the red probe is the base B of the triode.

Secondly, determine emitter E and collector C. Measure the other two poles with red and black probes respectively. When the measured resistance value is small, the black probe is connected to emitter E and the red probe is connected to collector C; When the measured resistance value is large, the black probe is connected to collector C and the red probe is connected to emitter E.