Transistor AF239 PNP, UHF TO-72

Transistor AF239 PNP, UHF TO-72

Transistor AF239 PNP, UHF TO-72

Transistor AF239 PNP, UHF TO-72

Transistor AF239 PNP, UHF TO-72

Transistors

Reference: TRAF239

Part.No: AF239

€1.59

In Stock

Immediate Dispatch

The AF239 is a vintage PNP germanium BJT in TO-72 package, purpose-built for UHF front-end amplification in television tuners and RF preamplifiers. Prized for its low noise figure and stability at VHF/UHF frequencies.

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Description
Product Details

AF239 Germanium PNP Transistor – Classic UHF Preamplifier for TV Tuners & RF Front-Ends

The AF239 is a legendary germanium PNP transistor optimized for UHF television preamplification and RF mixing stages. Its exceptionally low noise figure makes it ideal for antenna front-end circuits where signal purity and minimal added noise are paramount—preventing snow and ghosting in TV reception.

Functions & Applications

Low Noise Figure: Specially optimized for RF front-end stages, minimizing noise contribution to antenna circuits.
Germanium Construction: Vintage PNP design delivering natural soft characteristics valued in classic RF amplifiers.
UHF-Rated Performance: Engineered for stable operation across VHF and UHF television bands.
TO-72 Package: Classic through-hole metal can, familiar to vintage radio and TV repair technicians.
Collector-Base Diode Isolation: Internal structure supports mixing and detection applications.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-72
Collector-Base Voltage (Vcb)	~30V
Max Collector Current (Ic)	~50mA
Noise Figure (NF)	~3–4 dB @ UHF
Mounting Type	Through-Hole (THT), Metal Can

Frequently Asked Questions

Q: Is the AF239 still available, and can it be used in modern projects?
A: The AF239 is a vintage part, now obsolete from manufacturers but available as New Old Stock (NOS) from specialized suppliers. It is best suited to vintage TV/radio restoration rather than new designs; modern alternatives include low-noise RF transistors like the BFR93A.

Q: What is the complementary NPN transistor for the AF239?
A: The complementary NPN germanium transistor is the AF239N (or AF240 in some references), designed for similar UHF preamplifier stages.

Notes

AF239 is a vintage germanium transistor, now obsolete from manufacturers. Stock is NOS (New Old Stock). Requires careful ESD handling despite being germanium; long leads are prone to mechanical fracture. Heatsinking rarely needed due to low power dissipation.

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-72

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