Der Gate-Anschluss kann somit in bestimmten Bereichen mit sowohl positiven als auch negativen Spannungen gegen den Source-Anschluss beaufschlagt werden. Diese Linie ist bei den selbstsperrenden Typen, auch als Anreicherungstyp bezeichnet, unterbrochen. Der Pfeil wird bei diesen Transistoren am Bulk-Anschluss eingezeichnet und bei einem n-Kanal-Typ zu dem Transistorsymbol orientiert, bei einem p-Kanal vom Transistor weg gezeichnet. Fototransistoren sind optisch empfindliche bipolare Transistoren, wie sie unter anderem in Optokopplern Verwendung finden.

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Brief Description on S S 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.

It has a maximum gain value of ; this value determines the amplification capacity of the transistor normally S Since it is very high it is normally used for amplification purposes. However at a normal operating collector current the typical value of gain will be The maximum amount of current that could flow through the Collector pin is mA, hence we cannot drive loads that consume more than mA using this transistor. To bias a transistor we have to supply current to base pin, this current IB should be limited to 5mA.

When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region. S in Push-Pull Configuration As mentioned in the features the S transistor is commonly used in push pull configuration with Class B amplifier. So let us discuss how that is done. A push pull amplifier, commonly known as Class B amplifier is type of multistage amplifier commonly used for audio amplification of loudspeakers.

It is very simple to construct and requires two identical complimentary transistors operate. A simple circuit diagram of the Class B amplifier with the using the S is shown below.


Bipolarer Transistor



S9014 Datasheet – Vcbo=50V, Vceo=45V, NPN Transistor


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