Introduction to the Structure and Types of Crystal Transistors 1

The packaging form and pin identification of transistors

The commonly used packaging forms of transistors include metal packaging and plastic packaging, and the arrangement of pins follows certain rules,

Place the bottom view position so that the three pins form the vertices of an isosceles triangle, with ebc from left to right; For small and medium power plastic transistors, place the plane facing themselves and the three pins facing downwards according to the diagram, and the EBC is from left to right.transistors

At present, there are many types of transistors in China with different pin arrangements. For transistors with uncertain pin arrangements during use, measurements must be taken to determine the correct position of each pin, or the transistor user manual must be consulted to clarify the characteristics and corresponding technical parameters and information of the transistor.

The current amplification effect of transistors

The transistor has a current amplification function, which essentially means that the transistor can control the large change in collector current with a small change in base current. This is the most fundamental and important characteristic of a transistor. We refer to the ratio of Δ Ic/Δ Ib as the current amplification factor of the transistor, denoted by the symbol "β". The current amplification factor is a constant value for a certain transistor, but it may also change with the variation of the base current during the operation of thetransistors.