What Is an 8050 Transistor?

The triode 8050 is a very common NPN type crystal triode. It is often seen in various amplifying circuits. It has a wide range of applications and is mainly used for high frequency amplification. Can also be used as a switching circuit.

Transistor 8050

Triode 8050 is a very common NPN type

Type: switch type;

Polarity: NPN;

Material: Silicon;

Triode pin identification method:

(a) Determine the base. Use a multimeter R × 100 or R × 1k to measure the forward and reverse resistance values between each two of the three electrodes of the tube. When the first test lead is connected to an electrode, and the second test lead touches the other two electrodes successively to measure the low resistance value, the electrode connected to the first test lead is the base electrode b. At this time, pay attention to the polarity of the multimeter test lead, if the red test lead is connected to the base b. When the black test lead is connected to the other two poles and the measured resistance is small, it can be judged that the tube under test is a PNP-type transistor. If the resistance value is small, the transistor to be tested is an NPN type tube such as 8050, 9014, 9018.

(b) Determine the triode collector c and the emitter e. (Take PNP type triode as an example) Put the multimeter in R × 100 or R × 1K, pinch the base and the hypothetical collector (assuming that any of the remaining two poles is the collector and one is the emitter), black The contact of the test lead is assumed to be the collector, and the contact of the red test lead is assumed to have a large deflection of the emitter pointer, which is correct, but it is wrong anyway. Further verification, replacing the assumed collector and the assumed emitter, and repeating the operation, the assumption that the pointer deflection is large in two times is correct; npn red and black test leads are the opposite.

How to judge the quality of a triode without disassembling it:

In practical applications, low-power triodes are often directly soldered to printed circuit boards. Due to the high installation density of components and the troublesome disassembly, often the multimeter DC voltage block is used to measure the voltage of the pins of the tube under test Value to infer whether it is working properly, and then judge the quality of the transistor.

If it is an NPN like 8050 or 9014, use a multimeter to check their pins. Use a black test lead for one pole and a red pen for the other two poles. When both poles have 5K resistance, the black test lead is connected to the B pole. At this time, two black and red test leads are connected to the other two poles respectively. The black test lead is connected to the pole and the B pole, and the black indicator with a small resistance value is connected to the C pole. (The above is measured with a pointer meter. The digital meter is a red pen. The internal positive and negative levels of the digital multimeter are opposite to the pointer meter.)