Transistor BF173 NPN, Video/RF TO-72

Transistor BF173 NPN, Video/RF TO-72

Transistor BF173 NPN, Video/RF TO-72

Transistor BF173 NPN, Video/RF TO-72

Transistor BF173 NPN, Video/RF TO-72

Transistors

Reference: TRBF173

Part.No: BF173

€1.00

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The BF173 is an NPN Bipolar Junction Transistor (BJT) in a shielded TO-72 package, purpose-designed for video and RF applications. Commonly used as the final IF amplification stage in television receivers and high-frequency signal processing circuits.

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Description
Product Details

BF173 NPN Video/RF Transistor – High Linearity IF Amplifier for Television

The BF173 is an NPN transistor optimized for video and RF amplification in television IF stages. Its high linearity ensures distortion-free picture signal amplification, while the shielded TO-72 package with grounded can suppresses unwanted oscillation and interference—making it the ideal choice for the final fixed-gain IF amplification stage before video detection.

Functions & Applications

High Linearity: Amplifies video signals without distortion, ensuring clear picture quality in IF amplification stages.
Shielded TO-72 Package: Fourth lead grounds the protective can, eliminating unwanted oscillation and RF interference.
Fixed Gain Configuration: Provides maximum, stable gain output ideal for the final non-AGC IF amplification stage.
RF Stability: Engineered for reliable performance in video and intermediate-frequency circuits.

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: What is the difference between BF173 and BF167?
A: The BF167 is optimized for variable gain control (AGC-driven IF amplification), while the BF173 provides maximum fixed gain and is typically used as the final IF stage before the video detector.

Q: Why does the TO-72 package have a fourth lead?
A: The fourth lead connects to the metal can shield, which is grounded to eliminate RF oscillation and unwanted signal coupling—essential for stable, noise-free video signal amplification.

Notes

Classic mid-frequency NPN transistor used extensively in vintage and modern television IF amplification stages. Requires careful PCB layout and shielding to maintain linearity and suppress RF coupling.

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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