The BF869 is an NPN high-voltage transistor designed for stable operation in high-voltage amplification circuits. This article explains the BF869 pinout, key features, datasheet specifications, working principle, applications, and suitable alternatives to help you use it correctly in electronic designs.
Introduction
The BF869 is a high-voltage NPN bipolar junction transistor intended for low-current voltage amplification and signal processing tasks. It is commonly used in analog circuits, audio preamplifier stages, and industrial electronics where high voltage handling and dependable thermal performance are required.
Pin Configuration / Pinout of BF869 Transistor
Understanding the BF869 Pinout Configuration
The BF869 is housed 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 BF869 pinout is essential to ensure proper biasing and safe circuit operation.
Note: DATASHEET DOWNLOAD button is provided end of this article.
BF869 Key Features
- NPN high-voltage bipolar transistor
- Designed for voltage amplification stages
- Stable thermal performance in TO-202 package
- Medium-frequency operation capability
- Low collector current handling
- Suitable for audio and industrial analog circuits
BF869 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): 1.6W
- 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 BF869 Transistor
- High-voltage amplifier stages
- Audio preamplifier circuits
- Signal conditioning and voltage amplification
- Industrial electronic circuits
- Power supply driver stages
BF869 Equivalent / Alternatives
(Verify pin compatibility before using substitutions)
Equivalent Transistors:
- BF869A (if available variant)
Alternative Transistors:
- BF469
- MJE340
More Circuit Layouts
Working Principle of BF869
The BF869 operates as a current-controlled NPN transistor where a small base current controls a larger collector current. When the base-emitter junction is forward biased, carriers flow from the emitter to the collector, enabling amplification. Its high-voltage capability allows reliable performance in elevated-voltage environments.
Frequently Asked Questions (FAQ)
Q1: What type of transistor is BF869?
BF869 is an NPN high-voltage bipolar junction transistor.
Q2: What is the maximum voltage rating of BF869?
The BF869 supports up to 250V collector-emitter voltage.
Q3: What is the BF869 pin configuration?
The BF869 uses an E-C-B pinout in a TO-202 package.
Q4: Is BF869 suitable for audio applications?
Yes, it is suitable for audio preamplifier and voltage amplification circuits.
Conclusion
The BF869 NPN high-voltage transistor is a dependable choice for voltage amplification and signal processing applications. With its strong voltage handling, stable electrical characteristics, and TO-202 package, it fits well in industrial, audio, and high-voltage analog circuit designs.
Datasheet of BF869 Transistor
Click the following Button below to download the datasheet of BF869 :
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