Transistor AF102 PNP, Germanium TO-72

Transistor AF102 PNP, Germanium TO-72

Transistor AF102 PNP, Germanium TO-72

Transistor AF102 PNP, Germanium TO-72

Transistor AF102 PNP, Germanium TO-72

Transistors

Reference: TRAF102

Part.No: AF102

€1.20

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The AF102 is a PNP Germanium BJT in a TO-72 (4-lead) package, purpose-built for VHF/FM receiver front-end applications. Its grounded metal case and low feedback capacitance make it ideal for stable, low-noise RF amplification in vintage and modern radio designs.

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Description
Product Details

AF102 Germanium PNP Transistor - VHF/FM Receiver Amplifier

The AF102 is a classic germanium PNP transistor optimized for VHF and FM receiver applications. With its distinctive 4-lead TO-72 package—where the metal case itself serves as the fourth grounded lead—the AF102 delivers exceptional RF stability and minimal noise feedback, making it an essential choice for period-accurate vintage radio restoration and high-performance FM front-end design.

Functions & Applications

4-Lead Grounded Case (TO-72): Metal case serves as fourth grounded lead, providing maximum RF shielding and thermal stability.
Low Feedback Capacitance: Minimal reverse transmission ensures stable gain across the VHF band without parasitic oscillation.
Germanium Construction: Naturally low noise floor, ideal for sensitive RF pre-amplifier stages in FM receivers.
VHF Optimized: Excellent frequency response and gain flatness in the FM broadcast band (88–108 MHz).

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-72
Package Type	TO-72 (4-Lead, Grounded Case)
Mounting Type	Through-Hole (THT)
Material	Germanium

Frequently Asked Questions

Q: Can the AF102 be used in AM radio circuits?
A: Yes, the AF102 can operate in AM frequencies, but its design—particularly its low-noise characteristics and VHF gain profile—makes it optimally suited for FM band applications.

Q: What is the purpose of the fourth lead in TO-72 package?
A: The fourth lead is the metal case itself, which is grounded. This provides direct thermal and electrical grounding, significantly reducing RF coupling and noise, and improving stability in high-frequency circuits.

Notes

Classic germanium transistor with limited modern production; popular with vintage radio restorers and retro enthusiasts. Characteristics best suited for RF applications in the 88–108 MHz FM broadcast band.

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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