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What is a BC547 Transistor?

The BC547 transistor is a general-purpose bipolar NPN transistor with a gain range of 110 to 800Hfe, which determines the transistor device's amplification capabilities.
The maximum collector current, or maximum permitted current, of the transistor BC547 is 800Ma.
Furthermore, the BC547 transistor's maximum bias current is 5mA.
The transition frequency of the BC547 transistor is 30 MHZ, which is critical while the transistor is switching.

What is a 2N2222 Transistor?

A bipolar NPN transistor, the 2N2222 is a transistor with two poles. The maximum current gain of the 2N2222 transistor is 300hFE, and this number determines the transistor's amplification factor.
The maximum collector current of the 2N2222 transistor is 800mA; this is the greatest current that this device can handle.
The trigger terminal's maximum bias voltage is 200 mV, while the 2N2222 transistor's maximum bias current is 200 mA.
The maximum frequency on this frequency is 250MHZ, which is the 2N2222 transistor's transition frequency.

BC547 vs 2N2222 Features Comparison

BC547 Features

• NPN BJT Transistor

• DC Current Gain range is 110 to 800 hFE

• Collector current (IC) is 100mA

• Emitter to Base Voltage (VBE) is 6V

• Collector to Emitter Voltage (VCE) is 45V

• Collector to Base voltage ( VCB ) is 50V

• Base Current ( IB ) is 5mA maximum

• Available in TO-92 Package

2N2222 Features

• NPN BJT Transistor

• DC Current Gain range is 30 to 300 hFE

• Collector current (IC) is 800mA

• Emitter to Base Voltage (VBE) is 5V

• Collector to Emitter Voltage (VCE) is 30V

• Collector to Base voltage (VCB) is 60V

• Base Current (IB) is 200mA maximum

• Transition frequency (FT) is 250MHz

BC547 vs 2N2222 Applications Comparison

BC547 Applications

• Amplifier Circuits

• Preamp Circuits

• Driver Circuits

• Switching Circuits

• PMW Circuits

• Alarm Circuits

• Water Level Indicator Circuits

• Sensor Circuits

• Touch Switch Circuits

• Volume Level Changing Circuits

2N2222 Applications

• Low Power Applications

• Preamp

• Motor Driver Circuits

• Inverter Circuits

• Amplifier Circuits

• Switching Circuits

• Sensor Circuits

BC547 vs 2N2222 Amplifier Circuit
  BC547 Amplifier Circuit

The diagram depicts a basic amplifier circuit that uses BC547 and only has four components.
The input resistor and capacitor will be used as bypass components, with the resistor acting as a biasing agent for the BC547 transistor.
As a result, an audio signal received at the input is amplified and sent to the output speaker by the transistor.
2N2222 Amplifier Circuit

The diagram depicts an amplifier circuit using a 2N2222 transistor.
The best voltage amplifier circuit that uses the NPN 2N2222 transistor is the common emitter arrangement.
This one has a higher gain due to the transistor architecture.

BC547 vs 2N2222 As a Switch
 BC547 As a Switch

The schematic depicts the basic circuit of the BC547 as a switch, which contains two resistors for driving LEDs and a transistor bias terminal.
Current flows across the circuit when the switch is closed, and the transistor serves the function of a switch.
You can also use a timer to control when the LED turns on and off.
 2N2222 As a Switch

In the circuit, the 2N2222 transistor is shown as a switch, with an input resistor driving it and a second resistor driving the LED.
When the switch is closed, the transistor starts working, and the resistor value regulates the LED ON/OFF interval.

BC547 vs 2N2222 Equivalents

BC547 Equivalents

The BC series, such as BC549 and BC639, are the finest recommendations for the BC547 transistor equivalent, followed by the 2N2222 transistor.

BC636 replaces BC547, 2N2369, 2N3055, 2N3904, 2N3906, and 2SC5200 in the PNP.

2N2222 Equivalents

2N3904, BC547, BC548, and 2N3906 are 2N2222 comparable transistors.

Each of the 2N2222 equivalent transistors described here is an NPN bipolar transistor, with the majority of them being identical.

BC547 vs 2N2222 Package
BC547 Package

2N2222 Package

BC547 vs 2N2222 Interchangeability
The 2N2222 transistor is more powerful than the BC547. The 2N transistors were packaged in a to-18 package, which means they were enclosed with metal.
The BC547 transistor came in a to-92 package, but 2N2222 transistors, such as the PN2222 and KN2222, also came in to-92 packages.
The 2N2222 has an emitter, base, and collector pinout, whereas the BC547 has a collector, base, and emitter pinout.
The collector to base voltage at 2N2222 is 60 volts, whereas it is 50 volts at BC547, and the collector to emitter voltage is 30 volts at 2N2222 vs 45 volts at BC547. The voltage between the emitter and the base is 5 volts in 2N2222 and 6 volts in BC547.
The maximum collector current of the 2N2222 is 800mA, whereas the bc547's is 100mA.
Both the 2N2222 and the BC547 have the same power dissipation (500mw), the 2N2222 has a DC gain of 75 to 300HFe and the BC547 has a DC gain of 110 to 800HFe, and the 2N2222 has a thermal resistance of 146k/w and the BC547 has a thermal resistance of 83.3 C/w.
Because the transition frequency of 2N2222 is 250MHz and that of BC547 is 300MHz, the noise figure on 2N2222 is 4db and on BC547 is 10db.