C945 Transistor: Features, Applications, and Price

There are two NPN bipolar junction transistors in the C945 series. There are three regions in this device: emitter, collector, and base. P semiconductor type material is doped into the base. N-type semiconducting material coats both the collector and emitter. Because of its wide array of applications, it's an extremely popular low-cost gadget on the market. There are many useful functions provided by this device, including the ability to switch amplifiers quickly and to provide low-power electronic circuits.

What is a C945 Transistor?

Electronic circuits typically employ the C945 transistor for amplification and switching applications because it is a general-purpose NPN bipolar junction transistor. The C945 transistor has the following two characteristics:

 

• NPN Bipolar Junction Transistor: NPN transistors like the C945 belong to the bipolar junction transistor category. Three layers of semiconductor are present here: a thin layer of p-type semiconductor sandwiched between two thicker layers of n-type semiconductor. With appropriate voltage applied to its terminals, the transistor can act as a switch or amplify current.

• Typical Characteristics: The collector current rating of C945 transistors is typically between 50 and 150 mA, so they are suitable for low-power applications. VCBO (collector-base voltage) is approximately 60V, and VEBO (emitter-base voltage) is approximately 5V. Low cost, availability, and versatility of transistors make them frequently used in audio amplifiers, oscillators, and small signal switching devices.

 

 

An NPN bipolar junction transistor, the C945 offers a low cost, medium performance, and ease of use in electronic circuits for amplification and switching.

C945 Transistor Features

A bipolar junction transistor (BJT) with NPN characteristics, the C945 transistor is commonly used for a variety of electronic applications. Its key features are as follows:

 

NPN Configuration: In this transistor, an NPN configuration is configured by sandwiching one n-type layer between two p-type layers. If appropriate voltages are applied to the terminals, it can amplify current and control electron flow.

 

Collector Current (IC): There are typically 50 mA to 150 mA collector current ratings for the C945 transistor. The transistor can take a maximum current without damaging the collector terminal when this parameter is set to its maximum value.

 

Collector-Base Voltage (VCBO): C945 transistors typically have a collector-base voltage (VCBO) of 60V. Transistors can be damaged or melted if they are exposed to a voltage greater than this parameter.

 

Emitter-Base Voltage (VEBO): Typical emitter-base voltages of C945 transistors are around 5V. According to this parameter, the transistor can be broken down or damaged by applying a voltage between the emitter and base terminals.

 

DC Current Gain (hFE): Under specific operating conditions, the C945 transistor has a DC current gain determined by the ratio between the collector current (IC) and base current (IB). Transistors typically have hFE values of 70 to 400, indicating their ability to amplify.

 

Transition Frequency (fT): Transistor's current gain decreases significantly at its transition frequency (fT) at which it begins to degrade. The transistor's maximum operating frequency varies between several megahertz (MHz) and depends on this parameter.

 

Low Noise and Distortion: As an audio amplifier transistor and for other applications requiring signal fidelity, the C945 transistor exhibits low noise and distortion characteristics.

 

There are a number of features that make the C945 transistor a popular choice for various electronic applications requiring amplification, signal switching, and control, including its NPN configuration, collector current rating, voltage rating, DC current gain, transition frequency, low noise and distortion, and versatility.

C945 Transistor Equivalent Parts

In similar applications, several equivalent parts can be substituted for the C945 transistor, which is commonly used in various electronic circuits. C945 transistors are often replaced by the following equivalents:

 

2SC1815: It has similar characteristics to the C945 in terms of general-purpose NPN transistors. Amplification and switching applications requiring low power will benefit from its 150 mA collector current (IC) and 150 MHz transition frequency (fT).

 

BC547: An alternative to the C945 is the BC547, another popular NPN transistor. This device has an average collector current of 70 mA and a maximum collector current (IC) of 100 mA, based on a transition frequency (fT) of around 100 MHz. In switching circuits, audio amplifier circuits, and signal amplification, the BC547 is commonly used.

 

BC546: BC546 is an alternative to the C945 that is another NPN transistor. It operates at a transition frequency (fT) of 100 MHz and a maximum collector current (IC) of 100 mA. Applications for the BC546 include signal processing, amplification, and switching.

 

BC337: Its characteristics are similar to those of the C945 NPN transistor. An IC of up to 800 mA is available at 100 MHz, while a transition frequency (fT) of approximately 100 MHz is available. Switching circuits, voltage regulators, and audio amplifiers commonly use the BC337.

 

2N2222: The 2N2222 can be used in many applications instead of the C945 because it is a versatile NPN transistor. The maximum collector current (IC) of the device is usually 600 mA, due to its collector current of 600 mA and transition frequency (fT) of around 300 MHz. Typically, the 2N2222 is used for general-purpose applications, switching circuits, and audio amplifiers.

Applications

An electronic circuit or application may use the C945 transistor. The following is a detailed description of its applications:

 

Amplification Circuits: Circuits that use the C945 transistor for amplification are one of its primary applications. In audio amplifiers, preamplifiers, and other small-signal amplification circuits, it can be used as a small-signal amplifier. Transistors are ideal for enhancing audio signals in various electronic devices since they are capable of amplification of weak signals with little noise and distortion.

 

Switching Circuits: Electronic circuits can also use the C945 transistor as a switch. A transistor can control a larger current flowing between the collector and emitter terminals by applying a small current or voltage to the base terminal. A relay driver, LED driver, motor control circuit, and digital logic circuit can all make use of this switching capability.

 

Oscillator Circuits: The C945 transistor can produce oscillating signals at specific frequencies when used in oscillator circuits. Signal generators, clock circuits, and radio frequency oscillators can produce stable oscillations by configuring the transistor with suitable components like resistors, capacitors, and inductors.

 

Voltage Regulation Circuits: Voltage regulators can use the C945 transistor to stabilize the output voltage in voltage regulation circuits. Regardless of fluctuations in input voltage or load conditions, the transistor can maintain a constant output voltage by adjusting its biasing. A power supply, battery charger, or voltage regulator typically use this application.

 

Signal Processing Circuits: Electronic signals can also be manipulated or modified by the C945 transistor in signal processing circuits. Communication, audio, video, and data processing signals can be processed by filters, amplifiers, modulators, demodulators, and phase shifters using this technology.

 

Lighting Control Circuits: LEDs, incandescent bulbs, and fluorescent lamps can be dimmed or switched on/off by using the C945 transistor. The transistor allows energy-efficient lighting solutions and adjustable brightness levels by controlling current flow through the lighting device.

 

Sensor Interface Circuits: Sensor signals can be amplified, conditioned, or switched using the C945 transistor, such as temperature sensors, light sensors, and proximity sensors. For monitoring and controlling physical parameters in industrial, automotive, and consumer electronics applications, this application is commonly used in automation, instrumentation, and control systems.

C945 Transistor Price

Quantity, supplier, and location can all influence the price of the C945 transistor. As a relatively inexpensive component, the C945 transistor can be found in a wide range of electronic projects and applications for a few cents to a few dollars per unit. To obtain the most accurate information about pricing, check with electronic component distributors or online retailers. If you don't know any trusted dealer, then not to worry, you can check out Blikai Electronics. 

Faqs

Question 1: Are there any precautions to consider when using the C945 transistor?

Answer: In order to avoid damaging the C945 transistor, it's crucial to follow the datasheet's maximum ratings. It is also important to ensure reliable operation by properly biasing and dissipating heat.

 

Question 2: How do I identify the pinout of the C945 transistor?

Answer: Transistors with three terminals typically use the C945 pinout, which consists of the collector (C), base (B), and emitter (E). Positive supply voltage is often applied to the collector, input voltage is applied to the base, and output voltage is applied to the emitter.

 

Question 3: What is a C945 transistor?

Answer: Bipolar junction transistors (BJTs) such as the C945 are widely used in a number of applications. Electronic circuits commonly utilize this transistor to amplify, switch, and process signals.

Final Verdict

Transistors manufactured by C945 have a proven track record of delivering reliable performance in amplification, switching, and signal processing circuits. Hobbyists, students, and professionals alike choose it because of its affordability, availability, and compatibility. While its specifications are modest, the C945 transistor is an ideal low-power solution for a variety of applications. As a component of electronic design and innovation, the C945 transistor plays a significant role whether it's used in audio amplifiers, switching circuits, oscillators, or sensor interfaces.