Transistor BF177 NPN, Video Output TO-39

Transistor BF177 NPN, Video Output TO-39

Transistors

Reference: TRBF177

Part.No: BF177

€1.40

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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.

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Description
Product Details

BF177 High-Voltage NPN Transistor - Video Output & CRT Display Control

The BF177 is a specialized NPN transistor engineered for high-voltage, moderate-frequency applications. Originally built for CRT television deflection circuits, it excels at biasing picture tube electrodes and driving video output stages where voltages often exceed 100V. The rugged TO-39 metal can package provides excellent thermal stability and mechanical durability.

Functions & Applications

High Breakdown Voltage: Rated for video and deflection circuits requiring biases above 100V.
Metal TO-39 Package: Excellent heat dissipation and mechanical robustness; often paired with small heatsinks.
Moderate Frequency Response: Optimized for video deflection and output driver applications, not RF.
Stable Bias: Reliable performance in picture tube deflection and bias circuits.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-39
Collector-Emitter Voltage (Vceo)	100V
Package Type	Metal Can (TO-39)

Frequently Asked Questions

Q: Can the BF177 be used in modern circuits or only in vintage CRT equipment?
A: While designed for CRT deflection, the BF177 is still useful in high-voltage biasing applications, retro television restoration, and vintage audio/video circuits. Its 100V+ capability makes it valuable in any circuit requiring robust, moderate-current, high-voltage switching.

Q: Does the BF177 require a heatsink?
A: The TO-39 metal package provides good thermal dissipation for typical video applications. A small external heatsink is optional, depending on current and duty cycle; check the datasheet for your specific circuit.

Notes

Vintage part originally designed for CRT television deflection circuits. Widely used in retro electronics restoration and high-voltage biasing applications.

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-39

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