Transistor AF137 PNP, Germanium UHF TO-72

Transistor AF137 PNP, Germanium UHF TO-72

Transistor AF137 PNP, Germanium UHF TO-72

Transistor AF137 PNP, Germanium UHF TO-72

Transistor AF137 PNP, Germanium UHF TO-72

Transistors

Reference: TRAF137

Part.No: AF137

€1.40

In Stock

Immediate Dispatch

The AF137 is a vintage PNP germanium BJT in a TO-72 (4-lead) package, originally designed for UHF television and telecommunications applications. Its shielded 4th lead and low parasitic capacitance make it ideal for high-frequency oscillators, mixers, and RF amplifiers.

Add to cart

Subscribe To When In Stock

You have successfully subscribed to this product

Description
Product Details

AF137 Germanium UHF Transistor – Vintage RF Performance for Collectors & Retro Electronics

The AF137 is a rare vintage PNP germanium transistor designed in the 1960s for UHF television receivers and radio telecommunications. With its integrated electromagnetic shield (4th lead) and optimized geometry for high-frequency operation, it remains a prized choice for vintage radio restoration, retrocomputing projects, and specialist RF applications.

Functions & Applications

Integrated Electromagnetic Shield: 4th lead (case 2) provides RF isolation when grounded, reducing unwanted coupling.
Optimized for UHF: Engineered for minimal parasitic capacitance and excellent frequency response at VHF/UHF bands.
Germanium Material: Characteristic low forward bias voltage (~0.2V) and soft saturation ideal for vintage audio and RF circuits.
Vintage Stock: NOS (New Old Stock) from original 1960s manufacture, collector-grade and fully functional.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-72
Collector-Emitter Voltage (Vceo)	30V
Max Collector Current (Ic)	50mA
Power Dissipation (Pd)	200mW
Mounting Type	Through-Hole (THT), 4-lead shielded

Frequently Asked Questions

Q: Is the AF137 suitable for UHF oscillators and mixers?
A: Yes. The AF137 was specifically designed for mixer and oscillator stages at UHF frequencies. The shielded 4th lead must be grounded to ensure proper RF isolation and performance.

Q: Can I use a modern silicon replacement?
A: In some circuits, yes – but silicon transistors have different forward voltage drop (~0.6–0.7V) and saturation behaviour. For authentic vintage restoration or sensitive RF applications, the germanium AF137 is preferred.

Notes

Vintage NOS (New Old Stock) germanium part from original 1960s manufacture. The shielded 4-lead case (TO-72) is critical for RF performance—ensure the 4th (shield) lead is grounded in your circuit. Lower frequency characteristics than modern silicon alternatives.

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

16 other products in the same category:

Transistor BC369 PNP, 20V, 1A, 800mW, TO-92

Transistors

Transistor BC369 PNP, 1A TO-92

Reference:

TRBC369

The BC369 is a PNP Darlington transistor in a TO-92 package, combining two BJT stages internally for very high current gain. Ideal for driving relays, motors and lamps directly from low-current control signals.

In Stock

Transistor 2SA844 PNP, 0.15A TO-92

Transistors

Transistor 2SA844 PNP, 0.15A TO-92

Reference:

TR2SA844

The 2SA844 is a reliable PNP Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for small-signal amplification and low-power switching in general-purpose analog circuits, audio preamps, and DIY electronics.

Last items in stock

Transistor BC159 PNP 20V 100mA

Transistors

Transistor BC159 PNP, 0.1A TO-18

Reference:

TRBC159

The BC159 is a silicon PNP low-noise Bipolar Junction Transistor (BJT) in a TO-18 metal can package. Designed for low-noise audio-frequency (AF) input stages and general-purpose small-signal amplification.

In Stock

Transistor BC337 NPN, 45V, 800mA, 360mW, TO-92

Transistors

Transistor BC337 NPN, 800mA TO-92

Reference:

TRBC337

The BC337 is an NPN Bipolar Junction Transistor (BJT) in a TO-92 package, capable of handling higher currents than general-purpose small-signal transistors. Well suited for driving relays, LEDs and small loads in Arduino, ESP32 and DIY circuits.

In Stock

Transistor BC302 NPN, 60V, 0.5A, 0.85W TO-39

Transistors

Transistor BC302 NPN, 0.5A TO-39

Reference:

TRBC302

The BC302 is an NPN Bipolar Junction Transistor (BJT) in a metal TO-39 package, rated for 60V and 0.5A. Suitable for general-purpose amplification and switching applications requiring a robust metal-can case.

Last items in stock

Power Transistor AD162 PNP, TO-66

Transistors

Power Transistor AD162 PNP, TO-66

Reference:

TRAD162

The AD162 is a classic PNP Germanium Power Transistor in a TO-66 package. Legendary for push-pull audio output stages in vintage amplifiers from the 1960s–1970s, prized by restorers and audio enthusiasts for its warm, natural tone.

In Stock

Transistor 2SC900 NPN, 20mA TO-92

Transistors

Transistor 2SC900 NPN, 20mA TO-92

Reference:

TR2SC900

The 2SC900 is a silicon NPN small-signal transistor in a TO-92 package, originally designed as a low-frequency, low-noise amplifier for audio preamp and RF front-end stages.

In Stock

Transistor BC558

Transistors

Transistor BC548 NPN, 0.1A TO-92

Reference:

TRBC548

The BC548 is a high-performance NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Optimized for small signal amplification and low-power switching in Arduino, ESP32 and general-purpose DIY electronics.

In Stock

Power Transistor BD239 NPN, 1.5A TO-220

Transistors

Power Transistor BD239 NPN, 1.5A TO-220

Reference:

TRBD239

The BD239 is a robust NPN Power Transistor in a TO-220 package, purpose-built for audio amplifiers, linear power supplies and medium-power switching applications. Its complementary design with the BD240 (PNP) enables symmetrical push-pull amplification stages.

Last items in stock

Transistor BC179 PNP 20 V 50 mA 300 mW TO-18

Transistors

Transistor BC179 PNP, 50mA TO-18

Reference:

TRBC179

The BC179 is a low-noise PNP Bipolar Junction Transistor (BJT) in a metal TO-18 package. Designed for small-signal audio amplification and general-purpose switching in vintage and modern low-power circuits.

In Stock

Transistor BD185 NPN, 4A, 30V, 40W, TO-126

Transistors

Power Transistor BD185 NPN, 4A TO-126

Reference:

TRBD185

The BD185 is an NPN Bipolar Junction Transistor (BJT) in a TO-126 power package, rated for 4A collector current and 40W dissipation. Designed for switching and low-frequency power amplification stages.

Last items in stock

Transistor 2N2368

Transistors

Transistor 2N2904 PNP TO-39

Reference:

TR2N2904

The 2N2904 is a PNP Bipolar Junction Transistor (BJT) in a metal-can TO-39 package. Designed for high-speed saturated switching and general-purpose amplification in audio, driver and analog control circuits.

In Stock

Transistor 2N1711

Transistors

Transistor 2N1748

Reference:

TR2N1748

Last items in stock

Power Transistor BD175 NPN, 3A TO-126

Transistors

Power Transistor BD175 NPN, 3A TO-126

Reference:

TRBD175

The BD175 is an NPN power BJT transistor in a TO-126 package, rated for 45V and 3A. Suitable for power amplification, driver stages and switching applications requiring moderate current handling.

In Stock

Transistor 2SA950 PNP, 0.8A TO-92

Transistors

Transistor 2SA950 PNP, 0.8A TO-92

Reference:

TR2SA950

The 2SA950 is a reliable PNP Bipolar Junction Transistor (BJT) in a TO-92 package. Optimized for small-signal amplification and low-power switching in general-purpose audio, switching, and amplification circuits.

In Stock

Transistor BD202 PNP, 45V, 8A, 60W, TO-220

Transistors

Power Transistor BD202 PNP, 8A TO-220

Reference:

TRBD202

The BD202 is a PNP Bipolar Junction Transistor (BJT) in a TO-220 package, rated for 8A collector current and 60W dissipation. Suited for power amplification, motor driving and switching applications requiring a robust PNP counterpart.

Last items in stock

Product added to wishlist

Product added to compare.