Power Transistor BDW51 NPN, TO-3

Power Transistor BDW51 NPN, TO-3

Transistors

Reference: TRBDW51

Part.No: BDW51

€3.55

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The BDW51 is a high-power NPN Bipolar Junction Transistor (BJT) in a robust TO-3 metal package. Designed for heavy-duty linear amplification and power supply applications requiring superior thermal dissipation and reliability.

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Description
Product Details

BDW51 Power Transistor – Heavy-Duty NPN for Linear Amplifiers & PA Supplies

The BDW51 is a robust NPN power transistor housed in the iconic TO-3 metal package, a design choice that prioritizes thermal performance and current-handling capability. It is the workhorse of vintage and modern linear bench power supplies, PA amplifiers, and any application where high collector current and reliable heat dissipation are non-negotiable.

Functions & Applications

TO-3 Metal Package: Iconic "flying saucer" design for maximum thermal contact and superior heat dissipation in demanding applications.
High Current Capability: Built to handle substantial collector currents, typical of power amplifiers and regulated supplies.
Collector-as-Case: The entire metal case functions as the collector, simplifying mechanical mounting to heatsinks.
Linear Amplification: Excellent for Class-A audio power stages and precision linear bench PSUs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-3
Package Style	TO-3 (Collector=Case)
Mounting Type	Stud (Bolt-down to Heatsink)

Frequently Asked Questions

Q: Why does the BDW51 have only two leads if it's a transistor?
A: The BDW51 has two solder lugs (Base and Emitter); the entire metal case itself is the Collector terminal. This design allows direct bolting to a heatsink for excellent thermal coupling.

Q: Is the BDW51 still in production, or is it a legacy part?
A: The BDW51 is a mature, well-established design that has remained available from multiple manufacturers. It remains popular in audio and vintage equipment restoration due to its proven performance and thermal handling.

Notes

The BDW51 is a mature, widely-used power transistor in audio and linear supply designs. Always mount on an appropriate heatsink with thermal compound for reliable operation at rated current.

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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