The BF871 is an NPN high-voltage transistor suitable for reliable voltage amplification applications. This guide covers the BF871 pinout, features, specifications, working principle, applications, and compatible alternatives for practical circuit design.
Introduction
The BF871 is a high-voltage NPN bipolar junction transistor designed for low-current, high-voltage amplification tasks. It is commonly used in analog signal stages where stable electrical performance and good thermal reliability are required under elevated voltage conditions.
Pin Configuration / Pinout of BF871 Transistor
Understanding the BF871 Pinout Configuration
The BF871 comes in a TO-202 package and follows an E-C-B pin configuration when viewed from the front:
| Pin# | Pin Name |
|---|---|
| 1 | Emitter |
| 2 | Collector |
| 3 | Base |
Correct identification of the BF871 pinout ensures proper biasing and prevents damage during circuit assembly.
Note: DATASHEET DOWNLOAD button is provided end of this article.
BF871 Key Features
- NPN high-voltage bipolar transistor
- Designed for voltage amplification stages
- Stable operation at elevated voltages
- Medium-frequency performance capability
- Low collector current handling
- Robust TO-202 package for better heat dissipation
BF871 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 BF871 Transistor
- High-voltage amplifier circuits
- Audio and signal preamplifiers
- Voltage gain stages in analog electronics
- Industrial control and instrumentation circuits
- Power supply driver sections
BF871 Equivalent / Alternatives
(Verify pin compatibility before using substitutions)
Equivalent Transistors:
- BF871A (variant, if available)
Alternative Transistors:
- BF869
- BF469
- MJE340
More Circuit Layouts
Working Principle of BF871
The BF871 operates as a current-controlled NPN transistor. A small base current controls a larger collector current flowing from collector to emitter. When the base-emitter junction is forward biased, the transistor enters active mode, enabling voltage and signal amplification in high-voltage circuits.
Frequently Asked Questions (FAQ)
Q1: What type of transistor is BF871?
BF871 is an NPN high-voltage bipolar junction transistor.
Q2: What is the maximum voltage rating of BF871?
The BF871 supports up to 300V collector-emitter voltage.
Q3: What is the BF871 pin configuration?
The BF871 uses an E-C-B pinout in a TO-202 package.
Q4: Can BF871 be used in audio circuits?
Yes, it is suitable for audio preamplifiers and voltage amplification stages.
Conclusion
The BF871 NPN high-voltage transistor offers reliable performance for high-voltage, low-current amplification applications. With its robust voltage ratings, stable characteristics, and TO-202 package, it is well-suited for industrial, audio, and analog electronic designs.
Datasheet of BF871 Transistor
Click the following Button below to download the datasheet of BF871 :
More projects, You may like:
- Video Transmitter DIY Homemade FM Radio Transmitter
- Adjustable Power Supply DIY Battery Charger
- 12V-220V 500 Watt inverter DIY Homemade
- MPPT Solar Charge Controller DIY Homemade
- DIY LA4440 bass amplifier homemade
For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuit, battery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!