What is SMD triode and how to determine the pin sequence of SMD triode

What is SMD triode and how to determine the pin sequence of SMD triode

SMT triode, also known as crystal triode, refers to the general designation of three pin amplification devices in surface mount technology. SMT triode is the core component of electronic circuits by strengthening weak signals and having the function of current amplification. SMT triode is to make two PN junctions close to each other on a semiconductor substrate. Two PN junctions divide the whole semiconductor into three parts, and the middle part is the base area, The two sides are the transmitting area and the collecting area. According to the polarity, SMD triodes are classified into two types: one is NPN type triode, which is the most commonly used one at present, and the other is PNP type triode. There are two types of materials:

SMT triode, also known as crystal triode, refers to the general designation of three pin amplification devices in surface mount technology. SMT triode is the core component of electronic circuits by strengthening weak signals and having the function of current amplification. SMT triode is to make two PN junctions close to each other on a semiconductor substrate. Two PN junctions divide the whole semiconductor into three parts, and the middle part is the base area, The two sides are the transmitting area and the collecting area.

Classification of SMD triodes

It can be divided into two types according to polarity: one is NPN type triode, which is the most commonly used one at present, and the other is PNP type triode.

There are two kinds of materials: one is silicon triode, which is currently the most commonly used one, and the other is germanium triode.

According to the working frequency, it can be divided into two types: one is low-frequency triode; The other is high-frequency triode.

According to power, there are three kinds: one is small power triode, one is medium power triode, and the other is high power triode.

It can be divided into amplifier tube and switch tube according to the purpose.

How to determine the pin sequence of SMT triode?

From the appearance of the patch triode, you can see three large pins. Everyone who has contacted the patch triode knows that it is often necessary to judge the order of the pins, that is, to judge emitter e, base b and collector c. So how to determine the pin of the chip triode? Next, let me answer for you. According to the general rule, facing the seal, from left to right, it is BCE, except for TO-92. As shown in the figure, the three leads are called emitter e (Emitter), base b (Base) and collector c (Collector). There are also a few domestic and Taiwan made triodes,

From the appearance of the patch triode, you can see three large pins. Everyone who has contacted the patch triode knows that it is often necessary to judge the order of the pins, that is, to judge emitter e, base b and collector c. So how to determine the pin of the chip triode? Next, let me answer for you.

According to the general rule, facing the seal, from left to right, it is BCE, except for TO-92

The three leads are called emitter e (Emitter), base b (Base) and collector c (Collector)

There are also a few domestic and Taiwan made triodes, which are not in the order of pins made according to this rule, so you'd better look at the data manual when using them.

The circuit board manufacturer and circuit board designer will explain the SMT transistor and how to determine the pin sequence of the SMT transistor.