Transistor BF679 PNP, 30mA TO-50

Transistor BF679 PNP, 30mA TO-50

Transistors

Reference: TRBF679

Part.No: BF679

€1.20

In Stock

Immediate Dispatch

The BF679 is a silicon PNP RF/UHF transistor in a TO-50 (SOT-37) metal can package. Designed by Telefunken/AEG for mixer and local-oscillator stages in UHF tuner front-ends, typically found in older analog TV channel-selector boards.

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Description
Product Details

BF679 UHF PNP Transistor - Mixer & Oscillator Stages

The BF679 is a silicon PNP transistor engineered specifically for the demanding UHF frequency range, most commonly used as a mixer or local oscillator inside channel-selection modules of legacy analog TV tuners. Its metal TO-50 (SOT-37) can helps with thermal stability and RF shielding, making it a good choice when repairing or restoring vintage receiver front-ends that call for this exact part.

Functions & Applications

High Transition Frequency: Rated for hundreds of MHz, well into the UHF band, suitable for mixer and oscillator duty.
Metal TO-50 (SOT-37) Can: Provides RF shielding and mechanical robustness compared to plastic small-signal cases.
Low-Noise PNP Design: Optimized for weak-signal RF/VHF/UHF amplifier and converter stages.
Legacy Tuner Compatibility: A direct fit for original Telefunken/AEG channel-selector board designs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-50
Collector-Emitter Voltage (Vce max)	-35V
Collector-Base Voltage (Vcb max)	-40V
Max Collector Current (Ic)	-30mA
Power Dissipation (Ptot)	~160-170mW
Transition Frequency (fT)	~700-880MHz
DC Current Gain (hFE, min)	25

Frequently Asked Questions

Q: What can I use to replace a BF679?
A: It is commonly substituted with other PNP silicon UHF transistors of the same era, such as the BF506, provided the pinout and can size match your board.

Q: What was the BF679 originally designed for?
A: It was designed by Telefunken/AEG as a mixer or local-oscillator transistor for the UHF section of analog TV tuners, so it is mainly of interest for repairing or restoring this type of equipment today.

Notes

This is a legacy/vintage RF transistor originally used in analog TV UHF tuner modules; stock is typically limited (NOS) and intended mainly for repair/restoration of period equipment.

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: PNP
Transistor Case Style: TO-50
TO-92

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