Power Transistor BU326A NPN, 6A TO-3

Power Transistor BU326A NPN, 6A TO-3

Transistors

Reference: TRBU326A

Part.No: BU326A

€2.34

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The BU326A is a high-voltage NPN Power Transistor in a TO-3 package, purpose-built for CRT deflection in televisions and high-current switching in industrial power supplies. Its robust metal case and excellent thermal characteristics make it ideal for applications requiring rapid mains-voltage switching with minimal losses.

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Description
Product Details

BU326A High-Voltage Power Transistor – Industrial Switching & CRT Deflection

The BU326A is a heavy-duty NPN power transistor engineered for high-voltage switching applications. Originally designed for television CRT deflection circuits, it excels in switch-mode power supplies (SMPS) and other industrial equipment where rapid mains switching and reliable thermal management are critical. Its TO-3 metal package allows direct bolting to large heatsinks via mica insulators.

Functions & Applications

High Voltage Capability: Rated for 800V collector-emitter voltage, enabling safe switching of mains and industrial supplies.
High Current Handling: 6A continuous collector current ensures reliable operation in demanding power circuits.
Metal TO-3 Heatsink Package: Robust construction designed for direct bolting to massive heatsinks with mica insulators for superior thermal dissipation.
Fast Switching: Rapid on/off transitions minimize losses and heat generation in SMPS and deflection applications.
Industrial Heritage: Proven reliability in television deflection and power supply stages for decades.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-3
Collector-Emitter Voltage (Vceo)	800V
Max Collector Current (Ic)	6A
Mounting Type	Heatsink-Mountable (M6 Stud)

Frequently Asked Questions

Q: Can I substitute the BU326A with a BU208A?
A: The BU208A is rated for 1500V (higher voltage) but only 5A continuous current versus BU326A's 6A. Choose based on your circuit: use BU208A for higher-voltage TV deflection, BU326A for higher-current SMPS applications. Always verify your circuit's actual voltage and current demands.

Q: What heatsink and insulation do I need?
A: The BU326A's TO-3 package requires a substantial aluminum or copper heatsink bolted via an M6 mounting stud. Always use a mica insulator sheet between the transistor and heatsink to prevent electrical contact while allowing heat transfer. Apply thermal compound for optimal heat coupling.

Notes

BU326A is a classic industrial-grade power transistor; stock may vary. Verify availability and lead time before ordering in volume.

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-3

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