Transistor AF181 PNP, UHF Germanium TO-72

Transistor AF181 PNP, UHF Germanium TO-72

Transistor AF181 PNP, UHF Germanium TO-72

Transistor AF181 PNP, UHF Germanium TO-72

Transistor AF181 PNP, UHF Germanium TO-72

Transistors

Reference: TRAF181

Part.No: AF181

€1.59

In Stock

Immediate Dispatch

The AF181 is a PNP Germanium BJT in a TO-72 package, purpose-built for UHF oscillators and mixers in vintage television tuners. A four-lead shielded design ensures stable gain at exceptionally high frequencies.

Add to cart

Subscribe To When In Stock

You have successfully subscribed to this product

Description
Product Details

AF181 Germanium PNP Transistor – UHF Tuner & Vintage TV Repair

The AF181 is a vintage PNP germanium transistor specifically engineered for UHF television tuner circuits, particularly oscillators and mixers. Its shielded four-lead design maintains exceptional frequency response and gain stability across the UHF band, making it the go-to choice for restoring classic TV equipment.

Functions & Applications

UHF Optimized: Designed for stable performance in oscillator and mixer circuits at television frequencies.
Four-Lead Shielded Design: The fourth lead must be grounded to ensure proper operation and minimize crosstalk.
Germanium Construction: Delivers the low-noise characteristics and warm frequency response typical of vintage germanium devices.
Classic Repair Part: Essential component for restoring and maintaining vintage television tuners and RF equipment.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-72
Mounting Type	Through-Hole (THT), 4-Lead Shielded
Semiconductor Material	Germanium
Primary Application	UHF Oscillators, Mixers

Frequently Asked Questions

Q: Why must the fourth lead of the AF181 be grounded?
A: The fourth lead is a shielding connection that isolates the transistor from electromagnetic interference and prevents unwanted coupling in UHF circuits. Proper grounding is essential for stable gain and frequency response.

Q: Can the AF181 be used in FM radio circuits?
A: Theoretically yes, since FM operates at lower frequencies than UHF television, but the AF181 is specifically optimized for UHF and is typically reserved for television tuner repairs rather than FM applications.

Notes

NOS (New Old Stock) vintage germanium transistor. Typical of 1950s–1970s television equipment. Requires proper grounding of shield lead. Not suitable for breadboarding; use in PCB designs with dedicated UHF layout practice.

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 JFET BF245 N-Channel

Transistors

Transistor JFET BF245 N-Channel

Reference:

TRBF245

The BF245 (often A, B, or C) is arguably the most famous N-Channel JFET in Europe. Plastic TO-92 package.

Last items in stock

Transistor 2SB172 PNP, Germanium TO-1

Transistors

Transistor 2SB172 PNP, Germanium TO-1

Reference:

TR2SB172

The 2SB172 is a classic PNP Germanium Bipolar Junction Transistor (BJT) in a TO-1 metal can package. Purpose-built for vintage radio and amplifier repairs, offering authentic replacement performance for legacy audio and RF equipment.

In Stock

Transistor AF106 PNP, VHF Germanium TO-72

Transistor AF106 PNP, VHF Germanium TO-72 2

Transistors

Transistor AF106 PNP, VHF Germanium TO-72

Reference:

TRAF106

The AF106 is a PNP Germanium BJT in a TO-72 package, purpose-built for VHF/UHF tuning circuits. A classic component for vintage television and FM radio restoration, prized for its excellent high-frequency performance in oscillators and RF mixers.

In Stock

Transistor BD142 NPN, 45V, 15A, TO-3

Transistors

Power Transistor BD142 NPN, 15A TO-3

Reference:

TRBD142

The BD142 is a NPN Bipolar Junction Transistor (BJT) in a rugged TO-3 metal package, rated for up to 15A and 45V. Designed for high-current switching and power amplification in motor drivers, power supplies and audio output stages.

Last items in stock

Transistor BC395 NPN

Transistors

Transistor BC395 NPN

Reference:

TRBC395

Last items in stock

Transistor BF177 NPN, Video Output TO-39

Transistors

Transistor BF177 NPN, Video Output TO-39

Reference:

TRBF177

The BF177 is an NPN Bipolar Junction Transistor (BJT) in a TO-39 metal package, designed for high-voltage video output applications. Originally developed for CRT display deflection and electron beam control, the BF177 combines high breakdown voltage with stable performance at moderate frequencies.

In Stock

Power Transistor BD518 NPN, TO-220

Transistors

Power Transistor BD518 NPN, TO-220

Reference:

TRBD518

The BD518 is a robust NPN Power Transistor in a TO-220 package, designed for power management and linear regulation applications. Its high current capability and excellent thermal characteristics make it ideal for voltage control circuits and industrial power supplies.

In Stock

Transistor 2SC536 NPN, 0.1A TO-92

Transistors

Transistor 2SC536 NPN, 0.1A TO-92

Reference:

TR2SC536

The 2SC536 is a general-purpose NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Reliable and easy to use, it is ideal for switching and amplification in amateur electronics, prototyping and educational projects.

In Stock

Transistor BF414 PNP, RF TO-92

Transistors

Transistor BF414 PNP, RF TO-92

Reference:

TRBF414

The BF414 is a classic PNP Silicon RF Transistor in a TO-92 package. Optimized for intermediate frequency (IF) amplification and mixer stages in vintage radio receivers and telecommunications equipment.

In Stock

Transistor BD176 PNP, 45V, 3A, 30W, TO-126

Transistors

Power Transistor BD176 PNP, 3A TO-126

Reference:

TRBD176

The BD176 is a PNP power BJT transistor in a TO-126 package, rated for 45V and 3A. Suitable for power amplification, motor driving and switching applications requiring moderate power handling.

Last items in stock

Power Transistor 2SD330 NPN, 2A TO-220

Transistors

Power Transistor 2SD330 NPN, 2A TO-220

Reference:

TR2SD330

The 2SD330 is a robust NPN power transistor in a TO-220 package. Optimized for high-current switching and amplification in motor drivers, audio amplifiers, and industrial control circuits.

Last items in stock

Transistor BC171 NPN 45 V 100 mA 300 mW TO-92

Transistors

Transistor BC171 NPN, 0.1A TO-92

Reference:

TRBC171

The BC171 is an NPN Bipolar Junction Transistor (BJT) in a TO-92 package, rated for 45V / 100mA. A classic small-signal part suited to audio amplification and general-purpose switching in hobby and repair projects.

Last items in stock

Power Transistor TIP120 Darlington NPN, 5A TO-220

Power Transistor TIP120 Darlington NPN, 5A TO-220 2

Transistors

Power Transistor TIP120 Darlington NPN, 5A TO-220

STMicroelectronics

Reference:

TRTIP120

The TIP120 is a high-current Darlington NPN transistor in TO-220 package, designed for driving loads up to 5A. With exceptional current gain and low saturation voltage, it easily interfaces microcontroller outputs with motors, relays, solenoids and other power devices.

In Stock

Transistor BC558

Transistors

Transistor BC558 PNP, 30V, 0.1A TO-92

Reference:

TRBC558

In Stock

Power Transistor BU326A NPN, 6A TO-3

Transistors

Power Transistor BU326A NPN, 6A TO-3

Reference:

TRBU326A

The BU326A is a high-voltage NPN Power Transistor in a TO-3 package, purpose-built for CRT deflection in televisions and high-current switching in industrial power supplies. Its robust metal case and excellent thermal characteristics make it ideal for applications requiring rapid mains-voltage switching with minimal losses.

Last items in stock

Transistor BF196 NPN, TO-92

Transistors

Transistor BF196 NPN, TO-92

Reference:

TRBF196

The BF196 is a small-signal NPN BJT in TO-92 package, designed for RF and video IF amplification. Originally developed for television AGC (Automatic Gain Control) and broadband video circuits, the BF196 remains a reliable choice for vintage electronics restoration and RF applications.

In Stock

Product added to wishlist

Product added to compare.