There are several kinds of triodes, among which NPN transistor is commonly used. It usually has the characteristics that when the potential at the base point B is higher than the potential at the emitter point E by a few tenths of a volt, the emitter junction is in a forward bias state, while when the potential at the collector point C is higher than the potential at the point B by a few volts, the collector junction is in a reverse bias state, and the collector power supply Ec is higher than the base power supply Ebo. An NPN transistor consists of three semiconductors, two of which are N-type and one is P-type, with the P-type semiconductor in the middle and two N-type semiconductors on both sides. NPN transistor is one of the important devices in electronic circuits. Its main functions are current amplification and switching, and it is applied in many circuits. In this issue, Hottech introduces a classic triode product 2SC4544, which plays a very important role in power amplifier and other circuits.

Characteristics of 2SC4544

This NPN transistor produced by Hottech has very good electrical characteristics. Its collector-base voltage is 300V, collector-emitter voltage is 300V, emitter-base voltage is 7V, collector current is 100mA, minimum magnification is 30, maximum magnification is 200, and power dissipation is 2000mW. Hottech 2SC4544 product can withstand high collector-base voltage. As a high-power transistor, the maximum dissipation power can reach 2W, which is suitable for many high-power application scenarios and plays an important role in amplifier circuits, switching circuits and driving circuits. Its minimum collector output capacitance is 3.0 pF, and the weight of the whole machine is about 2.30 grams. 2SC4544 products with fins can increase the heat exchange surface area of heat exchanger.

This 2SC4544 product adopts a very common TO-220 package form, which is widely used in electronic industry. As a flat semiconductor package with three pins, the pin positions (1.2.3) are base, collector and emitter in turn, which can be used for heat dissipation and high power applications.

TO-220 packaging products often adopt the form of in-line packaging, which has strong applicability. TO-220 packaging can accommodate many diodes, triodes, voltage regulators, chips and other devices, which is very convenient. TO-220 is very convenient to manufacture and install, which makes the manufacturing process simpler and has excellent heat dissipation ability. The thickness of TO-220 packaging and large copper pins improve the heat dissipation ability, effectively solving the heat dissipation problem of high-power applications. 2SC4544 products have the characteristics of excellent performance, compact packaging structure, good heat dissipation effect, easy installation and wide application, and are the first choice for many electronic customers.

Application of 2SC4544

As a current and power amplification product, 2SC4544 can be used for power amplifier, power supply, battery, charging protection, motor control, motor drive, motor drive board, etc. The specific application products include TV, stereo, radio, rice cooker, smart plug, battery protection board, inverter, adapter, sweeping robot, fast charging, electric two-wheeled vehicle, massager, fan, vacuum cleaner, washing machine and so on. 2SC4544 is widely used in audio amplifier, circuit switch and other circuits.

The principle of transistor amplification circuit is as follows. Taking NPN silicon transistor as an example, we call the current flowing from base B to emitter E as base current Ib. The current flowing from collector C to emitter E is called collector current Ic. The directions of these two currents both flow out of the emitter, so an arrow is used on the emitter E to indicate the direction of the current. The amplification function of triode is that the collector current is controlled by the base current (assuming that the power supply can provide enough current to the collector), and a small change of the base current will cause a great change of the collector current, and the change satisfies a certain proportional relationship: the change of the collector current is β times that of the base current, that is, the current change is amplified β times, so we call β the amplification factor of triode. This parameter is very important for triode and determines its application scenario.

If we add a small changing signal between the base and the emitter, it will cause the change of the base current Ib. After the change of Ib is amplified, it will lead to a great change of Ic. If the collector current Ic flows through a resistor R, then according to the voltage calculation formula U=R*I, the voltage on this resistor will change greatly, and the amplified voltage signal will be obtained by taking out the voltage on this resistor.

When customers choose the package of plug-in, they need to consider the parameters such as power, voltage and frequency of the circuit and choose the appropriate package form. For circuits that need better heat dissipation performance, we should choose the packaging form with good heat dissipation performance. TO-220 package has built-in fin heat sink, which has good heat dissipation performance. As a common and widely used discrete device product, this triode produced by Hottech has good stability and high reliability, which has been verified by many large and medium-sized customers. The product has obvious advantages in electrical performance. Welcome to contact Hottech customer service for consultation.