Introduction
The 2SD718 is a well-known silicon NPN power transistor primarily used in high-power amplification and switching applications. As a robust and reliable component, it is commonly found in the output stages of audio amplifiers and in various power supply circuits. Its design focuses on handling significant power, with a high collector-emitter voltage (VCEO) of 120V and a generous collector current (IC) rating of 8A. The transistor’s high power dissipation of 80W in a durable TO-3P package ensures it can operate effectively under demanding thermal conditions.
This transistor is particularly popular in audio amplifier designs, especially for applications requiring a power output of around 45 to 50 watts. Its high DC current gain (hFE) of up to 160 allows a small signal from the pre-amplifier stage to control a much larger current flow, resulting in a strong output signal with low distortion. The 2SD718 is often paired with its complementary PNP equivalent, the 2SB688, to form a push-pull amplifier circuit, which is a standard configuration for efficient audio amplification.
2SD718 NPN Transistor
Beyond audio, the 2SD718 is also used in DC-DC converters, switching regulators, and as a motor driver. Its relatively fast transition frequency (fT) of 12MHz allows it to perform well in various high-speed switching tasks. Whether for a DIY project or a professional application, the 2SD718’s combination of high voltage, high current, and good thermal performance makes it a versatile and dependable choice for controlling power.
2SD718 NPN Transistor Pinout
2SD718 NPN Transistor Key Features
- High Current Capability
- High Power Dissipation
- High Voltage Rating
- High DC Current Gain
- Fast Switching Speed
- Robust Package TO-3P package
IRF540 MOSFET Specifications/Characteristics
| Characterstics | Rating (Max) |
|---|---|
| Max Collector-Emitter Voltage (VCE): | 120V |
| Max Collector-Base Voltage (VCB): | 120V |
| Max Emitter-Base Voltage (VEBO): | 5V |
| Max Collector Current (Ic) | 8A |
| Max Base Current (IB) | 0.8A |
| Max Collector Dissipation (Pc): | 80 Watt |
| Minimum & Maximum DC Current Gain (hFE): | 55 To 160 |
| Max Storage & Operating temperature: | -55 to +150 Centigrade |
More Circuit Layouts
Key Applications of 2SD718 NPN Transistor
Based on its key features and specifications, the 2SD718 NPN power transistor is widely used in a variety of electronic applications. Its ability to handle high power and voltage, combined with a good current gain, makes it a versatile component.
Here are some of the key applications of the 2SD718 transistor:
- Audio Amplifiers: This is one of the most common applications. The 2SD718 is frequently used in the output stage of Class B and Class AB audio power amplifiers, often paired with its PNP complement, the 2SB688, in a push-pull configuration to drive speakers.
- Power Supplies: Its high voltage and current ratings make it suitable for use in linear and switching power supplies to regulate and manage power flow.
- Motor Drivers: It can be used as a switching element to drive small to medium-sized DC motors in robotics, automation, and other electronic projects.
- DC-DC Converters: The transistor’s high-speed switching capability allows it to be used in DC-DC converters for efficient voltage conversion.
- High-Power Switching Circuits: Due to its ability to handle high current and voltage, the 2SD718 is used in various high-power switching applications where a reliable on/off control is needed.
- Voltage Regulators: It can function as a pass transistor in voltage regulator circuits to maintain a stable output voltage under varying load conditions.
PNP Complimentary Transistor
PNP Complementary of 2SD718 Transistor is 2SB688.
Equivalent Transistors of 2SD718
- 2SD1046
- 2SD1046D
- 2SD1046E
- 2SD910
- 2SD979
Datasheet of 2SD718
Click the following Button below to download the datasheet of 2SD718 Transistor :
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