Transistor BC547 NPN 45V / 0.1A

Transistor BC547 NPN 45V / 0.1A

Product information:

The BC547 transistor is an NPN transistor, which means that when current is applied to the base (control pin) it will flow from the collector to the emitter. Most commonly, NPN transistors are used in projects to "switch ground" to a device, meaning they are placed after the load in a circuit.

Maximum current: 100mA
Maximum power: 500mW
Maximum voltage (collector-emitter): 45V

Pinout:

What is the gain of a BC547 transistor?

The gain of a BC547 transistor is usually indicated by the hFE value or the DC gain. This is the ratio of the current going into the collector to the current going into the base.

For the BC547, the hFE is typically between 110 and 800, depending on the type and operating conditions (such as collector current and temperature). At lower collector currents, the gain can be lower, while at higher collector currents it increases.

The exact gain is often specified in the transistor datasheet.

What does an NPN transistor do?

An NPN transistor is a type of bipolar transistor that uses current or voltage to control the flow of current through a circuit. The key feature of an NPN transistor is that current flows from the collector to the emitter when a small current is applied to the base.

What an NPN transistor does:

Switching: When a positive voltage is applied to the base relative to the emitter (more positive than the emitter), the transistor turns 'on', allowing current to flow from the collector to the emitter. This is used in circuits to switch power.

Amplification: A small input current (from the base to the emitter) causes a much larger current to flow through the collector. This makes the NPN transistor useful as an amplifier for electrical signals.

In an NPN transistor, the collector is the positive side, the emitter is the negative side, and the base is the switch that enables current flow between the collector and emitter.

In summary: An NPN transistor allows current to flow from the collector to the emitter when a positive voltage is applied to the base.