transistor 2n3906 PNP 2pcs

Description

The 2N3906 is a commonly used PNP (Positive-Negative-Positive) bipolar junction transistor (BJT). It is widely used in electronics for various amplification and switching applications. Here are some key details about the 2N3906 PNP transistor:

1. **PNP Transistor:** The 2N3906 is a PNP transistor, which means it has three layers of semiconductor material: P (positive), N (negative), and P (positive). In PNP transistors, the current flows from the emitter (P), through the base (N), and into the collector (P).

2. **Symbol:** In circuit diagrams, PNP transistors are represented by the following symbol:

“`
_____
| |
–| |–
| |_____|
E B C
“`

– E: Emitter
– B: Base
– C: Collector

3. **Parameters:** The 2N3906 is a general-purpose transistor with parameters suitable for many low- to medium-power applications. Its maximum collector current (Ic) is typically around 200mA, and the collector-emitter voltage (Vce) can handle up to around 40V.

4. **Applications:** PNP transistors like the 2N3906 are used in various electronic circuits for tasks such as signal amplification, switching loads (e.g., turning on and off motors or relays), and as current sources. They are commonly used in audio amplifiers and digital logic circuits.

5. **Pinout:** The 2N3906 transistor typically has three leads (pins):
– Emitter (E): The emitter is the terminal through which the current enters the transistor.
– Base (B): The base terminal controls the flow of current between the emitter and collector.
– Collector (C): The collector is where the current exits the transistor.

6. **NPN Counterpart:** The 2N3906 has a complementary NPN transistor, the 2N3904, which has similar characteristics but with opposite current flow direction.

7. **Schematic Representation:** In a circuit diagram, the emitter of the 2N3906 is typically pointed toward the source of input voltage, and the collector is pointed toward the load or the next stage of the circuit.

8. **HFE:** The current gain, denoted by hfe or β, typically ranges from 100 to 300 for the 2N3906. It indicates the transistor’s ability to amplify current. Higher values indicate higher amplification.

The 2N3906 PNP transistor is a versatile and widely used component in electronics due to its reliability and general-purpose characteristics. It is a fundamental building block in many electronic circuits, and its complementary NPN transistor, the 2N3904, is often used in conjunction with it to create various amplification and switching circuits.