BC880 PNP Darlington Transistor Technical Summary

Overview

The BC880 is a PNP Darlington transistor housed in a TO-92 (SOT54) plastic package. It is designed for applications requiring high current gain and moderate power handling. The Darlington configuration provides extremely high current amplification, making it suitable for driving high-current loads with minimal input power. The integrated diode and resistor enhance its functionality in switching and amplification circuits.

Features

• High DC Current Gain: Minimum gain (h_FE) of 1000 ensures efficient signal amplification.
• High Current Handling: Maximum collector current (I_C) of 1 A allows for driving substantial loads.
• Low Voltage Operation: Maximum collector-emitter voltage (V_CEO) of 80 V, suitable for medium-voltage applications.
• Integrated Diode and Resistor: Simplifies circuit design by reducing external component count.
• TO-92 Package: Compact and widely used through-hole package for easy prototyping and assembly.

Applications

The BC880 is versatile and finds use in a variety of electronic circuits, including:

• Signal Amplification: Audio pre-amplifiers, sensor signal conditioning.
• Switching Circuits: Relay drivers, motor control, LED drivers.
• Power Management: Voltage regulators, current limiters.
• Automotive Electronics: Load drivers for lighting and actuators.
• Industrial Control: Solenoid and actuator control circuits.

Electrical Characteristics

The following tables outline the key electrical specifications of the BC880 transistor under standard conditions (unless otherwise noted).

Absolute Maximum Ratings

• Collector-Emitter Voltage (V_CEO): 80 V
• Collector-Base Voltage (V_CBO): 80 V
• Emitter-Base Voltage (V_EBO): 5 V
• Collector Current (I_C): 1 A
• Total Power Dissipation (P_tot): 625 mW
• Operating Junction Temperature (T_j): -55°C to +150°C

DC Current Gain (h_FE)

• Minimum: 1000 (at I_C = 500 mA, V_CE = 2 V)
• Typical: 5000 (under same conditions)

Saturation Characteristics

• Collector-Emitter Saturation Voltage (V_CE(sat)): 1.2 V (max) at I_C = 500 mA, I_B = 1 mA
• Base-Emitter Saturation Voltage (V_BE(sat)): 1.5 V (max) under same conditions

Dynamic Characteristics

• Transition Frequency (f_T): 50 MHz (typ) at V_CE = 5 V, I_C = 100 mA
• Turn-On Time (t_on): 500 ns (max)
• Turn-Off Time (t_off): 2 μs (max)

Package Information

The BC880 is available in a TO-92 (SOT54) plastic package, which is a through-hole design with three leads. The package dimensions and pin configuration are as follows:

Mechanical Dimensions

• Package Type: TO-92 (SOT54)
• Lead Material: Tin-plated copper
• Body Length: 4.95 mm (max)
• Body Width: 3.9 mm (max)
• Body Height: 4.95 mm (max)
• Lead Spacing: 2.54 mm (between adjacent leads)

Pin Configuration

• Pin 1 (Emitter): Connected to the emitter of the Darlington pair.
• Pin 2 (Collector): Connected to the collector of the Darlington pair.
• Pin 3 (Base): Connected to the base input of the Darlington configuration.

Thermal Characteristics

• Thermal Resistance, Junction-to-Ambient (R_thJA): 200°C/W (max)
• Thermal Resistance, Junction-to-Lead (R_thJL): 83.3°C/W (max)

Conclusion

The BC880 PNP Darlington transistor is a robust and high-gain component suitable for a wide range of amplification and switching applications. Its integrated diode and resistor simplify circuit design, while the TO-92 package ensures ease of use in prototyping and production. With a high current gain of at least 1000 and a collector current rating of 1 A, it is an excellent choice for driving moderate loads in industrial, automotive, and consumer electronics.