Working principle of digital transistor

Digital transistors are not much different from ordinary transistors and do not use any digital technology. They only have one or two built-in bias resistors, known as bias resistor transistors. Compared with ordinary transistors, digital transistors have a linear input-output relationship and stable operating conditions.

A digital transistor is a bipolar transistor that integrates a base resistor. Its working principle is similar to conventional transistors, but it has higher integration and more convenient use.

Digital transistors are mainly composed of three regions: base region, emitter region, and collector region. When a certain voltage is applied to the base region, a current flows into the collector region, resulting in an open state.

Compared to conventional transistors, the base region of digital transistors has higher resistance and lower reverse leakage current. In addition, the digital transistor also adds a base resistor to the transistor structure to facilitate user control of its current.

The working principle of digital transistors is the same as that of ordinary transistors.

In this circuit, a forward voltage is input between the base (B) and emitter (E) of an NPN transistor, injecting a base current. That is to say, injecting+holes into the base (B) field.

If+electrons are injected into the base (B) region, the charge carriers of the emitter (E) will be attracted to the base (B), but the positive (B) region is very thin, so by adding a collector voltage, the charge carriers can cross the base (B) and flow towards the collector (C). In this way, the current flows from the collector (C) to the emitter (E), and the digital transistor begins to operate. Digital transistors have a wide range of applications, such as serving as switching or driving devices in circuits, as well as amplifying devices in digital signal amplifiers and power amplifiers. Their advantages are relatively high speed, high voltage tolerance, and low noise, while also being easy to integrate into digital circuit design.