Identification and detection of transistor 1

By using a certain process to fabricate two PN junctions on a semiconductor substrate, a three-layer semiconductor is formed. A lead is drawn out from each of the three-layer semiconductors, which are the three electrodes of the transistor. The transistor is then packaged in a casing to make it. transistor

The three electrodes of a transistor are called the emitter e, base b, and collector c. Each corresponding layer of semiconductor is called the emitter region, base region, and collector region. The PN junction where the emitter region and base region intersect is called the emitter junction, and the PN junction where the collector region and base region intersect is called the collector junction.

There are two types of transistors, NPN and PNP, which can be combined to form a transistor. The word symbol for a transistor is VT, and their basic structure. Common transistor shapes.

The main parameters of a transistor include performance parameters and limit parameters.

(1) Performance parameters.

① Current amplification factor. transistor

a. The common emitter circuit's AC current amplification factor is commonly referred to as the current amplification factor port.

b. The DC current amplification factor FE of the common emitter circuit is usually taken as p-hFE for ease of use, and Lu is used as a constant. transistor