The BF872 is a PNP high-voltage transistor designed for stable amplification in demanding circuits. This article explains the BF872 pinout, features, specifications, working principle, applications, and suitable alternatives in a clear and practical format.
Introduction
The BF872 is a high-voltage PNP bipolar junction transistor intended for low-current amplification where negative supply rails are used. Its ability to handle high voltages with stable gain makes it suitable for analog signal processing, industrial electronics, and audio driver stages.
Pin Configuration / Pinout of BF872 Transistor
Understanding the BF872 Pinout Configuration
The BF872 is housed in a TO-202 package and uses an E-C-B pin configuration when viewed from the front:
| Pin# | Pin Name |
|---|---|
| 1 | Emitter |
| 2 | Collector |
| 3 | Base |
Correct identification of the BF872 pinout is essential for proper biasing and safe circuit operation.
Note: DATASHEET DOWNLOAD button is provided end of this article.
BF872 Key Features
- PNP high-voltage bipolar transistor
- Suitable for negative voltage supply designs
- Designed for voltage amplification stages
- Stable electrical performance
- Medium-frequency operation capability
- Rugged TO-202 package for improved thermal handling
BF872 Specifications/Characteristics
- Collector-Emitter Voltage (Vceo): −300V
- Collector-Base Voltage (Vcbo): −300V
- Emitter-Base Voltage (Vebo): −5V
- Collector Current (Ic): −50mA
- Peak Collector Current (Icm): −100mA
- Total Power Dissipation (Ptot): 1.6W
- Junction Temperature (Tj): 150°C
- Storage Temperature (Tstg): −65°C to 150°C
- DC Current Gain (hFE): 50
- Transition Frequency (fT): 60MHz
Key Applications of BF872 Transistor
- High-voltage signal amplifier stages
- Audio and analog preamplifiers
- Industrial control circuits
- Power supply driver sections
- Instrumentation and monitoring systems
BF872 Equivalent / Alternatives
(Verify pin compatibility before using substitutions)
Equivalent Transistors:
- BF872A (variant, if available)
Alternative Transistors:
- BF470
- BF472
- MJE350
More Circuit Layouts
Working Principle of BF872
The BF872 operates as a current-controlled PNP transistor. When the base-emitter junction is forward biased with a negative base voltage relative to the emitter, charge carriers flow and allow a controlled collector current. This behavior enables the transistor to amplify voltage and signals in high-voltage PNP configurations.
Frequently Asked Questions (FAQ)
Q1: What type of transistor is BF872?
BF872 is a PNP high-voltage bipolar junction transistor.
Q2: What is the maximum voltage rating of BF872?
The BF872 supports up to −300V collector-emitter voltage.
Q3: What is the BF872 pin configuration?
The BF872 uses an E-C-B pinout in a TO-202 package.
Q4: Is BF872 suitable for audio circuits?
Yes, it can be used in audio and analog voltage amplification stages.
Conclusion
The BF872 PNP high-voltage transistor is a reliable choice for circuits requiring stable amplification on negative voltage rails. With its strong voltage handling capability, consistent gain, and durable TO-202 package, it fits well in industrial, audio, and high-voltage analog designs.
Datasheet of BF872 Transistor
Click the following Button below to download the datasheet of BF872 :
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