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D880 Transistor: What You Need to Know

What is a D880 Transistor?

The D880 is an NPN bipolar junction transistor (BJT) designed for high-power applications. It is capable of handling high currents and voltages, making it suitable for use in power amplifiers, voltage regulators, and switching circuits.

Key Characteristics of the D880 Transistor

Parameter Value
Collector-Emitter Voltage (VCEO) 80 V
Collector-Base Voltage (VCBO) 100 V
Emitter-Base Voltage (VEBO) 5 V
Collector Current (IC) 10 A
Power Dissipation (PD) 75 W
Current Gain (hFE) 50-150
Transition Frequency (fT) 50 MHz

These characteristics make the D880 transistor well-suited for high-power applications where efficient power handling and fast switching speeds are required.

How Does a D880 Transistor Work?

Like all BJTs, the D880 transistor has three terminals: the collector, base, and emitter. The transistor’s operation is controlled by the current flowing through the base-emitter junction, which in turn regulates the current flowing through the collector-emitter junction.

Basic Operation Modes

  1. Active Mode: When a small current is applied to the base-emitter junction, the transistor allows a larger current to flow through the collector-emitter junction. The ratio of these currents is determined by the transistor’s current gain (hFE).

  2. Saturation Mode: When the base current is increased beyond a certain point, the transistor becomes fully turned on, and the collector-emitter voltage drops to a minimal value. In this mode, the transistor acts like a closed switch.

  3. Cut-off Mode: When the base current is reduced to zero or the base-emitter junction is reverse-biased, the transistor turns off, and no current flows through the collector-emitter junction. In this mode, the transistor acts like an open switch.

Applications of D880 Transistors

The D880 transistor is used in a wide range of electronic applications, particularly those requiring high-power handling capabilities.

Power Amplifiers

In audio and RF power amplifiers, D880 transistors are often used in the output stages to drive loudspeakers or antennas. Their high current and voltage handling capabilities make them ideal for delivering large amounts of power to the load.

Voltage Regulators

D880 transistors can be used in linear voltage regulator circuits to control the output voltage and provide current limiting protection. Their high power dissipation rating allows them to handle the heat generated during voltage regulation.

Switching Circuits

In power electronic applications, such as switch-mode power supplies and Motor Controllers, D880 transistors are used as high-speed switches. Their fast switching speeds and high current handling capabilities make them suitable for efficiently controlling large currents.

Designing with D880 Transistors

When designing circuits using D880 transistors, several important factors must be considered to ensure optimal performance and reliability.


Proper biasing of the D880 transistor is crucial for stable operation and to prevent thermal runaway. The base current must be carefully controlled to maintain the transistor in the desired operating mode (active, saturation, or cut-off).

Heat Dissipation

Given the high power handling capabilities of the D880 transistor, efficient heat dissipation is essential. Adequate heatsinking and thermal management techniques must be employed to prevent the transistor from overheating and failing prematurely.

Protection Circuitry

In high-power applications, it is important to include protection circuitry to safeguard the D880 transistor from overload conditions, such as excessive current or voltage. Current limiting, over-voltage protection, and thermal shutdown circuits can help prevent damage to the transistor and ensure reliable operation.

Frequently Asked Questions (FAQ)

  1. What is the maximum collector-emitter voltage rating for the D880 transistor?
    The maximum collector-emitter voltage rating for the D880 transistor is 80 V.

  2. Can the D880 transistor be used in switch-mode power supplies?
    Yes, the D880 transistor is well-suited for use in switch-mode power supplies due to its high current handling capabilities and fast switching speeds.

  3. How much power can the D880 transistor dissipate?
    The D880 transistor has a power dissipation rating of 75 W, making it capable of handling high-power applications.

  4. Is heatsinking necessary when using the D880 transistor?
    Yes, proper heatsinking is crucial when using the D880 transistor, especially in high-power applications, to prevent overheating and ensure reliable operation.

  5. What is the current gain range of the D880 transistor?
    The current gain (hFE) of the D880 transistor typically ranges from 50 to 150, depending on the operating conditions.


The D880 transistor is a powerful and versatile component that finds applications in various high-power electronic circuits. Its high voltage and current handling capabilities, combined with fast switching speeds, make it an excellent choice for power amplifiers, voltage regulators, and switching circuits.

When designing with D880 transistors, proper biasing, heat dissipation, and protection circuitry are essential to ensure optimal performance and long-term reliability. By understanding the characteristics and application considerations of the D880 transistor, engineers and hobbyists can effectively utilize this component in their projects and achieve the desired results.