The BF471 is an NPN high-voltage transistor designed for stable operation in high-voltage amplification circuits. This article explains the BF471 pinout, features, electrical specifications, working principle, applications, and suitable equivalents to give a complete understanding of this device.
Introduction
The BF471 is a high-voltage NPN bipolar junction transistor intended for voltage amplification and signal processing applications. It is commonly used where high collector-emitter voltage handling, low collector current, and reliable thermal performance are required in analog and industrial electronic circuits.
Pin Configuration / Pinout of BF471 Transistor
Understanding the BF471 Pinout Configuration
The BF471 comes in a TO-126 package with an E-C-B pin configuration when viewed from the front:
| Pin# | Pin Name |
|---|---|
| 1 | Emitter |
| 2 | Collector |
| 3 | Base |
Correct identification of the BF471 pinout is critical to ensure safe circuit operation and prevent device failure.
Note: DATASHEET DOWNLOAD button is provided end of this article.
BF471 Key Features
- NPN high-voltage bipolar transistor
- Designed for voltage amplification stages
- Stable thermal performance in TO-126 package
- Medium-frequency operation capability
- Low collector current handling
- Suitable for industrial and audio signal circuits
BF471 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): 1.8W
- 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 BF471 Transistor
- High-voltage amplifier stages
- Signal amplification circuits
- Audio preamplifiers
- Industrial electronics
- Power supply driver and control circuits
BF471 Equivalent / Alternatives
(Verify pin compatibility before using substitutions)
Equivalent Transistors:
- BF469
Alternative Transistors:
- BF458
- MJE340
More Circuit Layouts
Working Principle of BF471
The BF471 operates as a current-controlled device where a small base current controls a larger collector current. When the base-emitter junction is forward biased, charge carriers flow from emitter to collector, enabling signal amplification. Its high voltage ratings allow reliable operation in elevated-voltage environments.
Frequently Asked Questions (FAQ)
Q1: What type of transistor is BF471?
BF471 is an NPN high-voltage bipolar junction transistor.
Q2: What is the maximum collector-emitter voltage of BF471?
The maximum Vceo rating of BF471 is 300V.
Q3: What is the BF471 pin configuration?
The BF471 uses an E-C-B pinout in a TO-126 package.
Q4: Can BF471 be used in audio circuits?
Yes, it is suitable for audio preamplifier and voltage amplification applications.
Conclusion
The BF471 NPN high-voltage transistor is a dependable choice for voltage amplification and signal processing tasks. With its high voltage tolerance, stable electrical behavior, and compact TO-126 package, it fits well in industrial, audio, and high-voltage analog circuit designs.
Datasheet of BF471 Transistor
Click the following Button below to download the datasheet of BF471 :
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