Power Transistor BF457 NPN, 160V TO-126

Power Transistor BF457 NPN, 160V TO-126

Transistors

Reference: TRBF457

Part.No: BF457

€1.20

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The BF457 is a high-voltage NPN power transistor in a TO-126 package, purpose-designed for video output stages and CRT display drivers. Rated for 160V, it handles the demanding switching and amplification requirements of color cathode (RGB) circuits in television and monitor neck boards.

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Description
Product Details

BF457 High-Voltage Power Transistor - CRT Video Output Driver

The BF457 is an industry-standard NPN transistor for high-voltage video output applications, particularly in CRT display drivers where it reliably handles the RGB cathode switching for color televisions and monitors. Its TO-126 package allows direct mounting to a heatsink, essential for managing the thermal load of high-speed video switching.

Functions & Applications

High Collector-Emitter Voltage (160V): Withstands the demanding voltage levels required by CRT picture tube circuits.
TO-126 Package with Mounting Flange: Direct bolt-to-heatsink design, enabling efficient heat dissipation for sustained operation.
Industry-Standard Performance: Complementary to BF458 and BF459, forming the RGB trio for color cathode drivers.
Reliable Video Switching: Optimized for fast switching transitions and stable gain across the video bandwidth.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	160V
Mounting Type	Through-Hole (THT) with Mounting Flange

Frequently Asked Questions

Q: Does the BF457 require a heatsink?
A: Yes, absolutely. The high-voltage switching operation in CRT video drivers generates significant heat. All three transistors (R, G, B) are typically bolted to a single long aluminum heatsink for proper thermal management.

Q: What are the complementary color transistors for RGB output?
A: The BF457 is typically used with BF458 and BF459 to form a complete RGB trio for driving the three color cathodes (red, green, blue) in CRT displays.

Notes

This is a specialized vintage/legacy part primarily used in CRT television and monitor driver circuits. Heatsinking is mandatory for reliable operation.

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-126

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