Power Transistor BU408 NPN, 8A TO-220

Power Transistor BU408 NPN, 8A TO-220

Transistors

Reference: TRBU408

Part.No: BU408

€2.34

In Stock

Immediate Dispatch

The BU408 is a high-voltage NPN power transistor in a TO-220 package, specifically designed for horizontal deflection (LOPT) circuits in CRT monitors, arcade displays and vintage television sets. Its fast switching speed and robust construction make it ideal for demanding retrace applications.

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Description
Product Details

BU408 High-Voltage Power Transistor - Fast Retrace Driver for CRT Displays

The BU408 is a high-speed NPN power transistor engineered for horizontal deflection and high-voltage switching applications. With its fast switching capability and robust design, it remains the choice for servicing and building vintage CRT monitor drivers, arcade cabinet displays, and LOPT (Line Output Transformer) circuits in television sets.

Functions & Applications

Fast Switching Speed: Essential for reliable retrace generation in CRT deflection circuits.
High-Voltage Rating: Handles the demanding voltage transients of LOPT (Line Output Transformer) stages.
Robust TO-220 Package: Easy heatsinking and mounting on TV/monitor chassis.
No Internal Damper Diode: Standard BU40x design; freewheeling diode provided separately on the circuit board.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-220
Max Collector-Emitter Voltage (Vceo)	1500V
Max Collector Current (Ic)	8A
Mounting Type	Through-Hole (THT), TO-220 with heatsink tab

Frequently Asked Questions

Q: Can I use the BU408 to replace a BU406 or BU406D?
A: The BU408 has slightly different voltage and current ratings than the BU406. Check the specific circuit board specification for compatibility; they are often interchangeable in LOPT stages but verify before replacing.

Q: Does the BU408 require a heatsink?
A: Yes, in most LOPT and deflection applications, a heatsink is strongly recommended to manage thermal dissipation during high-frequency switching and prevent thermal runaway.

Notes

Vintage CRT-era component; ensure your circuit board design matches the BU408 specification exactly before use, as the BU40x family has subtle variants (BU406, BU407, BU408, BU406D) for different LOPT designs.

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-220

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