The BF470 is a PNP high-voltage transistor developed for stable operation in high-voltage amplification circuits. This article explains the BF470 pinout, core features, datasheet specifications, working principle, applications, and suitable alternatives to help you use it correctly in electronic designs.
Introduction
The BF470 is a high-voltage PNP bipolar junction transistor designed for low-current voltage amplification tasks. It is widely used in analog signal stages, audio preamplifiers, and industrial electronics where negative voltage handling and reliable thermal performance are required.
Pin Configuration / Pinout of BF470 Transistor
Understanding the BF470 Pinout Configuration
The BF470 is packaged in a TO-126 case 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 BF470 pinout is essential to ensure proper biasing and to prevent circuit damage.
Note: DATASHEET DOWNLOAD button is provided end of this article.
BF470 Key Features
- PNP high-voltage bipolar transistor
- Designed for voltage amplification stages
- Stable thermal performance in TO-126 package
- Medium-frequency operation capability
- Suitable for analog and audio signal circuits
- Reliable operation in negative voltage systems
BF470 Specifications/Characteristics
- Collector-Emitter Voltage (Vceo): −250V
- Collector-Base Voltage (Vcbo): −250V
- 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 BF470 Transistor
- High-voltage amplifier stages
- Audio preamplifier circuits
- Signal conditioning circuits
- Industrial analog electronics
- Power supply control and driver stages
BF470 Equivalent / Alternatives
(Verify pin compatibility before using substitutions)
Equivalent Transistors:
- BF471 (complementary type depending on circuit design)
Alternative Transistors:
- BF458
- MJE350
More Circuit Layouts
Working Principle of BF470
The BF470 operates as a current-controlled PNP transistor where a small base current controls a larger emitter-to-collector current. When the base-emitter junction is forward biased with respect to the emitter, charge carriers flow and allow amplification. Its high-voltage ratings make it suitable for circuits operating at elevated negative voltages.
Frequently Asked Questions (FAQ)
Q1: What type of transistor is BF470?
BF470 is a PNP high-voltage bipolar junction transistor.
Q2: What is the maximum voltage rating of BF470?
The BF470 supports up to −250V collector-emitter voltage.
Q3: What is the BF470 pin configuration?
The BF470 uses an E-C-B pinout in a TO-126 package.
Q4: Is BF470 suitable for audio applications?
Yes, it is commonly used in audio preamplifier and voltage amplification circuits.
Conclusion
The BF470 PNP high-voltage transistor is a dependable choice for negative-voltage amplification and signal processing applications. With strong voltage handling, stable electrical characteristics, and a TO-126 package, it fits well in audio, industrial, and high-voltage analog circuit designs.
Datasheet of BF470 Transistor
Click the following Button below to download the datasheet of BF470 :
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