BF872 - PNP Transistor in TO-202 Package

Overview

The BF872 is a high-performance PNP transistor housed in a TO-202 plastic package. Designed for general-purpose amplification and switching applications, this transistor offers reliable performance with low feedback capacitance, making it suitable for high-frequency and low-noise circuits. Its robust construction ensures durability, while its electrical characteristics make it a versatile choice for various electronic designs.

Features

• Low Feedback Capacitance: Minimizes signal distortion in high-frequency applications.
• High Current Gain (h_FE): Ensures efficient amplification with minimal input current.
• TO-202 Plastic Package: Provides mechanical strength and thermal stability.
• Low Saturation Voltage: Enhances efficiency in switching applications.
• Wide Operating Temperature Range: Suitable for use in diverse environmental conditions.

Applications

The BF872 is widely used in electronic circuits requiring PNP transistors with high-frequency performance and low noise. Key applications include:

• Audio Amplifiers: Low feedback capacitance ensures clear signal reproduction.
• Switching Circuits: Fast switching speeds and low saturation voltage improve efficiency.
• RF Applications: Suitable for radio frequency amplification due to its high-frequency response.
• Signal Processing: Used in pre-amplifiers and signal conditioning circuits.
• General-Purpose Amplification: Ideal for use in analog circuits requiring PNP transistors.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the BF872 transistor under standard test conditions (unless otherwise specified).

Absolute Maximum Ratings

• Collector-Base Voltage (V_CB): -40V
• Collector-Emitter Voltage (V_CE): -25V
• Emitter-Base Voltage (V_EB): -5V
• Collector Current (I_C): -1A
• Total Power Dissipation (P_tot): 10W (at T_amb ≤ 25°C)
• Operating Junction Temperature (T_j): -55°C to +150°C
• Storage Temperature Range (T_stg): -55°C to +150°C

Electrical Characteristics (T_amb = 25°C unless noted)

• DC Current Gain (h_FE): 40 to 250 (at I_C = -100mA, V_CE = -5V)
• Collector-Emitter Saturation Voltage (V_CE(sat)): -0.3V (max) at I_C = -500mA, I_B = -50mA
• Base-Emitter Saturation Voltage (V_BE(sat)): -1.2V (max) at I_C = -500mA, I_B = -50mA
• Transition Frequency (f_T): 50MHz (min) at I_C = -100mA, V_CE = -5V, f = 100MHz
• Output Capacitance (C_obo): 10pF (max) at V_CB = -10V, f = 1MHz
• Input Capacitance (C_ibo): 20pF (max) at V_EB = -0.5V, f = 1MHz

Package Information

The BF872 is housed in a TO-202 plastic package, which provides excellent thermal and mechanical properties. Below are the key dimensions and package details:

TO-202 Package Dimensions

• Package Type: TO-202 (Plastic)
• Mounting Style: Through-hole
• Lead Material: Copper alloy
• Weight: Approximately 1.2g
• Pin Configuration:
  • Pin 1: Emitter (E)
  • Pin 2: Base (B)
  • Pin 3: Collector (C)

Mechanical Drawing

The TO-202 package has the following mechanical dimensions (typical values):

• Total Height: 9.5mm (max)
• Body Length: 10.5mm (max)
• Body Width: 4.6mm (max)
• Lead Length: 15mm (min)
• Lead Spacing: 2.54mm (between pins)

Thermal Characteristics

The thermal performance of the BF872 is critical for ensuring reliable operation under varying load conditions. Key thermal parameters include:

• Thermal Resistance, Junction-to-Ambient (R_thJA): 62.5°C/W
• Thermal Resistance, Junction-to-Case (R_thJC): 25°C/W

Reliability and Quality

The BF872 is manufactured under strict quality control standards to ensure long-term reliability. It complies with industry-standard testing protocols, including:

• ESD protection (up to 2kV Human Body Model)
• Moisture Sensitivity Level (MSL 1)
• RoHS compliance (lead-free)

Conclusion

The BF872 PNP transistor is a versatile and reliable component suitable for a wide range of amplification and switching applications. Its low feedback capacitance, high current gain, and robust TO-202 package make it an excellent choice for designers seeking performance and durability. Whether used in audio amplifiers, RF circuits, or general-purpose switching, the BF872 delivers consistent and efficient operation.