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What is the difference of Electronics, BC547 Transistor vs 2N2222 Transistor?

Hi Friends! Hope you are doing well. Today I would like to have a discussion on Electronics Components. Both the BC547 and 2N222 are bipolar NPN transistors. The 2N2222 and BC547 transistors are general-purpose transistors that are commonly used in electrical circuits; the BC547 transistor is one of the best transistor counterparts which can interchange with 2N2222 transistor. But what is the difference between BC547 Transistor vs 2N2222 Transistor? This article will answer your questions and show you their similarities and differences, as well as their interchangeability.

In this post, we’ll discuss each and everything related to the two transistors, the difference in the Features, Equivalents, Circuits, Application and other detailed information. Let’s dive right in and explore everything you need to know.

  1. Overview of Two Electronics

What is 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 Electronics’ 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 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.


2. Features of Two Transistors

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, 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, Base voltage (VCB) is 60V, Base Current (IB) is 200mA maximum, Transition frequency (FT) is 250MHz


3. Applications of Two Transistors

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


4. The Comparation of Amplifier Circuit 

The diagram depicts a basic amplifier circuit that uses BC547 electronic 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.

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.


5. As a Switch

BC547 Electronic As a Switch

When a transistor is utilized as a switch, it operates in the Saturation and Cut-Off Regions, as previously discussed. As previously stated, a transistor will behave as an Open switch during Forward Bias and as a Closed switch during Reverse Bias when the proper amount of current is supplied to the base pin. As previously stated, the biasing current should not exceed 5mA. Any current more than 5mA will destroy the transistor, hence a resistor is always connected in series with the base pin. This resistor’s value (RB) can be computed using the formula below.

2N2222 Electronic 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.


6. The Equivalents of the Two Transistors

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

In the PNP, BC636 electronics takes the position of BC547, 2N2369, 2N3055, 2N3904, 2N3906, and 2SC5200.

2N2222 Equivalents include the 2N3904, BC547, BC548, and 2N3906 transistors.
The 2N2222 equivalent transistors are all NPN bipolar transistors, with the bulk of them being identical.


7. 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 Electronics, 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 Electronics 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.


8. The Manufacturer of Two Transistors


ON Semiconductor (Nasdaq: ON) is a leader in energy efficiency, enabling clients to cut worldwide energy consumption. To assist design engineers in solving their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace, and power supply applications, the company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete, and custom solutions. ON Semiconductor has a world-class supply chain and quality program, as well as a network of manufacturing sites, sales offices, and design centers in important markets across North America, Europe, and Asia Pacific.


STMicroelectronics is a leading global independent semiconductor firm that develops and delivers semiconductor solutions for a wide range of microelectronics applications. The Company is at the forefront of System-on-Chip (SoC) technology, and its products play a major role in supporting today’s convergence trends, thanks to an unparalleled mix of silicon and system expertise, manufacturing capabilities, Intellectual Property (IP) portfolio, and strategic partners.


9. FAQ of Two Transistors

(1) Can I use 2N2222A instead of 2N2222 electronics?

They’re interchangeable most of the time because they’re the same thing. The datasheets for 2N2222 (metal package TO-18) and PN2222 (plastic packaging TO-92) can be found here.

(2) Can I use BC548 instead of BC547?

NO, BC547 is an NPN and BC548 is a PNP transistor both the transistors are not substituted for each other.

(3) What is the difference between BC547 and BC557?

BC557 is PNP, BC547 is NPN to see what is this transistor reconstructs a circuit from existing PCB on paper, then you will know.


That’s all for today. I hope you have found this article useful about Electronics. If you have any questions, you can approach me in the comment section below, I’d to help you in any way I can. Keep us updated with your valuable feedback and suggestion that help us provide you with quality content as per your needs and requirements. Thanks for reading the article.


Nice to meet you. I’m an editor from Utmel Electronic and have created more than 20 articles on electronic components. This is my latest article:

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