Transistor BF194 NPN RF/IF, 30mA TO-92

Transistor BF194 NPN RF/IF, 30mA TO-92

Transistors

Reference: TRBF194

Part.No: BF194

€0.60

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The BF194 is a classic NPN BJT in TO-92 package, purpose-designed for RF and IF amplification at 455kHz (AM) and 10.7MHz (FM). Industry standard for portable radio receivers, with extremely low internal capacitance for minimal signal attenuation at radio frequencies.

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Description
Product Details

BF194 RF/IF Transistor - Classic Radio Frequency Amplifier for 455kHz & 10.7MHz

The BF194 is an NPN transistor optimized for RF and IF stage amplification in portable AM/FM radios. Its low-capacitance design makes it ideal for tuned amplifiers and frequency-selective circuits without the signal loss typical of general-purpose small-signal transistors.

Functions & Applications

Low Capacitance (Cbe, Cbc): Minimal parasitic capacitance ensures clean amplification at 455kHz and 10.7MHz without attenuation.
High Frequency Response: Optimized for IF and RF stages in AM/FM receiver front-ends.
TO-92 Through-Hole: Pre-formable leads (lock-fit) for fast PCB insertion during mass production; easy hand-soldering for hobbyists.
Low Noise: Excellent for low-level signal reception in radio tuner circuits.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	30V
Max Collector Current (Ic)	30mA
Power Dissipation (Pd)	200mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: How does BF194 differ from BC547 for radio applications?
A: The BF194 has significantly lower internal capacitances (Cbe, Cbc), allowing efficient amplification at RF/IF frequencies (455kHz, 10.7MHz) without signal loss. BC547 is optimized for lower frequencies and general-purpose switching.

Q: Can I use BF194 as a direct replacement for other IF transistors in a vintage radio?
A: Yes, BF194 is electrically compatible with similar small-signal RF transistors like BF173, BF178, and others in the BF17x/BF19x families, though PCB lead spacing should be verified first.

Notes

The BF194 is a classic legacy component widely used in vintage portable radios and AM/FM receiver modules from the 1960s–1990s. Excellent for restoration projects and educational circuits. Pre-formed leads (lock-fit) may require gentle straightening for breadboard use.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-92

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