BD680

BD680: Silicon Epitaxial-Base NPN Power Transistor

Overview

The BD680 is a silicon epitaxial-base NPN power transistor designed for high-power amplification and switching applications. It is part of a series that includes the BD677, BD677A, BD679, BD679A, and BD681, offering a range of voltage and current handling capabilities. The BD680 is particularly suited for applications requiring robust performance in demanding environments, such as power supplies, motor control, and audio amplification. Its construction ensures high current gain, low saturation voltage, and excellent thermal stability.

Features

• High Current Capability: Capable of handling collector currents up to 4A, making it suitable for power applications.
• Low Saturation Voltage: Ensures efficient switching and minimal power loss during operation.
• High Voltage Tolerance: Supports collector-emitter voltages up to 80V, providing flexibility in various circuit designs.
• Excellent Thermal Stability: Designed to operate reliably across a wide temperature range (-65°C to +150°C).
• Complementary PNP Available: The BD680 pairs well with PNP transistors like the BD681 for push-pull configurations.
• Epitaxial-Base Construction: Enhances performance by reducing parasitic effects and improving switching speed.

Applications

The BD680 is widely used in both industrial and consumer electronics due to its robust performance characteristics. Key applications include:

• Power Amplifiers: Used in audio and RF amplification stages where high current and voltage handling are required.
• Switching Regulators: Ideal for DC-DC converters and voltage regulation circuits due to its low saturation voltage.
• Motor Control: Suitable for driving motors in appliances, automotive systems, and robotics.
• Linear Power Supplies: Provides stable performance in series pass regulators and other linear power applications.
• Relay and Solenoid Drivers: Its high current capability makes it effective for driving inductive loads.

Electrical Characteristics

The following table summarizes the key electrical parameters of the BD680 under typical operating conditions (unless otherwise specified):

• Collector-Emitter Voltage (V_CEO): 80V
• Collector-Base Voltage (V_CBO): 100V
• Emitter-Base Voltage (V_EBO): 5V
• Continuous Collector Current (I_C): 4A
• Total Power Dissipation (P_tot): 40W (at T_c = 25°C)
• DC Current Gain (h_FE): 40 to 160 (at I_C = 0.5A, V_CE = 2V)
• Collector-Emitter Saturation Voltage (V_CE(sat)): 0.5V (max) (at I_C = 2A, I_B = 0.2A)
• Transition Frequency (f_T): 3MHz (typical)

Package Information

The BD680 is available in a robust TO-126 package, which provides excellent thermal performance and mechanical durability. Key package details include:

• Package Type: TO-126 (also known as SOT-32)
• Mounting Style: Through-hole
• Pin Configuration:
  • Pin 1: Emitter
  • Pin 2: Collector
  • Pin 3: Base
• Thermal Resistance (R_thj-case): 3.125°C/W
• Weight: Approximately 1.2 grams
• Operating and Storage Temperature Range: -65°C to +150°C

Thermal and Mechanical Considerations

To ensure optimal performance and longevity, proper thermal management is essential when using the BD680. The following guidelines should be observed:

• Heat Sinking: A suitable heat sink should be used when operating near maximum power dissipation limits.
• Mounting: Ensure secure mounting to minimize thermal resistance between the transistor and heat sink.
• Derating: Power dissipation should be derated linearly above 25°C case temperature to prevent thermal runaway.

Reliability and Compliance

The BD680 is designed to meet industry standards for reliability and performance. It complies with the following:

• RoHS compliant (Restriction of Hazardous Substances)
• Manufactured under strict quality control standards (ISO 9001 certified)
• ESD protection measures should still be applied during handling to prevent damage.

Conclusion

The BD680 is a versatile and reliable NPN power transistor suitable for a wide range of high-power applications. Its combination of high current capability, low saturation voltage, and excellent thermal performance makes it a preferred choice for designers working on power amplification and switching circuits. By adhering to recommended operating conditions and thermal management practices, the BD680 can deliver consistent performance in even the most demanding environments.