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Note: Complete Technical Details can be found at the BD transistor datasheet provided at the bottom of this page. BD is a NPN transistor hence the collector and emitter will be left open Reverse biased when the base pin is held at ground and will be closed Forward biased when a signal is provided to base pin.

BD has a gain value of 40 to , this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 1. When this transistor is fully biased then it can allow a maximum of 1. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region.

The BD was originally manufactured by Phillips rated at MHz for specific audio applications, later they were cloned by other manufacturers like Samsung, ST etc. Another peculiar fact about this transistor is that it comes in plastic package, while most medium power transistor are available only in metal can package. This reduces the cost of the Transistor and also since the package is not conductive it will not be affected by other noise in the circuit.

Due to this feature this transistor is widely used in amplifier applications. So if you are looking for a medium power NPN transistor in Plastic package then this Transistor might be the right choice for you. Subscribe to stay updated with industry's latest Electronics components and news. Component Datasheet. BD Transistor Datasheet. Tags NPN Transistor. Get Our Weekly Newsletter!


Datasheet «BD138»

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BD135,BD136,BD137,BD138,BD139,BD140,Medium Power Transistors,Pack of 2 5 or 10



BD138 Bipolar Transistor


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