Introduction
The 2SB688 is a silicon PNP power transistor widely recognized for its high power and current handling capabilities. It is designed to be the complementary pair to the 2SD718 NPN transistor, making them a perfect match for high-fidelity audio amplifier applications. The transistor features a high collector-emitter voltage (VCEO) of -120V and can handle a continuous collector current (IC) of -8A, making it suitable for driving significant loads. Its high power dissipation of 80W and robust TO-3P package ensure that it remains stable and reliable under demanding thermal conditions.
The 2SB688 is a cornerstone component in high-power audio amplifier circuits, where its excellent performance over a wide range of frequencies helps deliver good sound quality. When used with the 2SD718 in a push-pull configuration, it efficiently amplifies both the positive and negative halves of an audio signal, resulting in a cleaner output with minimal distortion. This is a common design in amplifiers with an output of around 45 to 50 watts. The transistor’s high DC current gain (hFE), which ranges from 55 to 160, allows a low-level input signal to control a much larger output, simplifying the circuit design.
2SB688 PNP Transistor
Beyond audio, the 2SB688 is also a versatile power switch for various applications. It’s often used in DC-DC converters, switching regulators, and as a motor driver, where its ability to handle high current and voltage is essential. Its robustness and simple drive requirements make it a reliable choice for engineers and hobbyists alike for projects that require a dependable power switching solution. The combination of its power handling, thermal efficiency, and compatibility with its NPN counterpart solidifies its place as a go-to transistor for power electronics.
2SB688 Pinout
2SB688 PNP Transistor Key Features
- High Current Capability
- High Power Dissipation
- High Voltage Rating
- DC Current Gain
- Complementary Pair NPN
- Robust Package TO-3P
2SB688 Transistor Specifications/Characteristics
| Characterstics | Rating (Max) |
|---|---|
| Max Collector Current(IC): | -8A |
| Max Collector-Emitter Voltage (VCE): | -120V |
| Max Collector-Base Voltage (VCB): | -120V |
| Max Emitter-Base Voltage (VEBO): | -5V |
| 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 2SB688 PNP Transistor
The 2SB688 is a silicon PNP power transistor that is the complementary pair to the 2SD718 NPN transistor. Because of this complementary relationship, their applications are very similar, particularly in amplifiers and power switching circuits.
Here are some of the key applications of the 2SB688 transistor :
- Audio Amplifiers: This is its most common and well-known application. The 2SB688 is used in the output stage of audio power amplifiers, where it works in tandem with the 2SD718 in a push-pull configuration to efficiently amplify audio signals to drive speakers. This configuration minimizes distortion and maximizes output power.
- Power Supplies: Its ability to handle high voltage and current makes it suitable for use in both linear and switching power supplies as a series or shunt regulator to provide a stable output voltage.
- Motor Drivers: The 2SB688 can be used as a power switch in circuits that control the speed and direction of DC motors, making it a valuable component in robotics and other automated systems.
- DC-DC Converters: Its high power rating and fast switching speed make it suitable for use in DC-DC converter circuits for efficiently converting and regulating DC voltage levels.
- Voltage Regulators: Similar to its use in power supplies, the 2SB688 can be implemented in voltage regulator circuits to maintain a constant output voltage, even with fluctuations in the input or load.
NPN Complimentary Transistor
NPN Complementary of 2SB688 Transistor is 2SD718.
Equivalent Transistors of 2SB688
2SA1986, 2SA2031, 2SA1942, 2SA1805, 2SA1695, 2SA1492, 2SB1317 2SA1386, 2SA1301, 2SA1941, 2SA1146, 2SA1105, 2SA1186, 2SA1943, 2SA1303, 2SA1093, 2SA1940, 2SA1804, 2SA1694, 2SA1104, 2SA1516, 2SA1106,2SA1491, 2SA1264, 2SA1490, 2SA1302, 2SA1265.
Datasheet of 2SB688 PNP Transistor
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