Transistor BF181 NPN, UHF TO-72

Transistor BF181 NPN, UHF TO-72

Transistor BF181 NPN, UHF TO-72

Transistor BF181 NPN, UHF TO-72

Transistor BF181 NPN, UHF TO-72

Transistors

Reference: TRBF181

Part.No: BF181

€1.40

In Stock

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The BF181 is a classic NPN silicon transistor in a TO-72 package, optimized for UHF oscillator and mixer applications. Renowned for stable frequency generation in TV tuner circuits and RF switching stages.

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Description
Product Details

BF181 UHF Transistor – Classic Choice for TV Tuner Oscillators & RF Circuits

The BF181 is a proven NPN transistor engineered for UHF applications, particularly as a local oscillator in television tuner circuits. Its silicon construction delivers excellent frequency stability and minimal drift as operating temperature rises, making it the preferred choice for vintage and legacy broadcast equipment.

Functions & Applications

UHF Oscillator Optimized: Excellent high-frequency stability and low phase noise for TV tuner local oscillators.
Thermal Stability: Silicon construction minimizes frequency drift during warm-up, critical for broadcast receivers.
TO-72 Case Design: Integrated shield pin allows easy shielding to prevent parasitic oscillation at UHF.
Low Noise Performance: Suitable for sensitive RF mixer and pre-amplifier stages.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-72
Collector-Emitter Voltage (Vceo)	20V
Max Collector Current (Ic)	50mA
Power Dissipation (Pd)	200mW
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: Must I ground the 4th pin (case) of the BF181?
A: Yes, grounding the shield pin (case) is absolutely mandatory at UHF frequencies to suppress parasitic oscillation and ensure stable operation.

Q: Is the BF181 suitable for modern hobbyist RF projects, or is it legacy-only?
A: While vintage in design, it remains excellent for classical UHF oscillator circuits, TV tuner restoration, and low-power RF switching. For modern broadband applications, newer low-noise GaAs FETs are preferred.

Notes

Classic UHF transistor from mid-20th century broadcast era. Remains the standard choice for TV tuner restoration and vintage radio projects.

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: NPN
Transistor Case Style: TO-72

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