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NPN transistor BF 494

📡 BF494 – NPN High-Frequency Transistor (TO-92)

The BF494 is a general-purpose NPN transistor specifically designed for high-frequency and radio frequency (RF) applications. With a transition frequency up to 250 MHz, it is commonly used in RF amplifiers, oscillators, mixers, and IF stages in AM/FM radios and RF circuits.

⚙️ Technical Specifications

ParameterSpecification
Transistor TypeNPN BJT
Collector-Emitter Voltage30V
Collector Current (max)100 mA
Power Dissipation300 mW
Transition Frequency (f<sub>T</sub>)250 MHz
DC Current Gain (hFE)40 – 250
Package TypeTO-92 (plastic, 3-pin)

📎 Pin Configuration (TO-92)

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CopyEdit
   FRONT VIEW
   _______
  |       |
  |       |
  |_______|
   | | |
  E C B

  • E – Emitter

  • C – Collector

  • B – Base

✅ Features

  • 📻 High-frequency performance up to 250 MHz

  • 🧭 Ideal for AM/FM radios, RF amplifiers, and oscillators

  • 📶 Excellent linearity and gain stability

  • 🔧 Easy to use in breadboards and through-hole PCBs

  • 🛠️ TO-92 package for compact RF designs

🧪 Common Applications

  • AM/FM radio intermediate frequency (IF) amplifiers

  • Oscillator circuits in RF modules

  • RF preamps and signal boosters

  • General-purpose high-frequency switching

🎥 YouTube Tutorial

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npn Transistor