The value of this current can be calculated by the required amount of current that will be consumed by the load. As we know the transistor is a current controlled device meaning, we have pass some current (I B) thorough the base of the transistor to turn it on. This resistor is connected to the base pin of the transistor to limit the current flowing through the base. Since transistor is of NPN the load to be switched should be connected to the collector and the emitter should be connected to the ground as show in the figure below.Īnother important thing to keep in mind, while using a transistor as switch is the base resistor. So let’s discuss how to use one in a circuit. The 2N2219 is a NPN transistor and is normally used as a switch in many circuits. So if you looking for an NPN transistor that could switch loads or for decent amplification then 2N2219 might the right choice for your project.

Overall it is just another small signal transistor which is commonly used in switching and amplifying circuits. But it comes in a metal can package and can operate on voltages slightly higher than what a 2N2222 can handle. The 2N2219 transistor is very much similar to the commonly used NPN transistor 2N2222. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 600 mV. When this transistor is fully biased then it can allow a maximum of 800mA to flow across the collector and emitter.

To bias a transistor we have to supply current to base pin, this current (I B) should be limited to 5mA by using a transistor to the base pin. The maximum amount of current that could flow through the Collector pin is 800mA, hence we cannot connect loads that consume more than 800mA using this transistor. 2N2219 has a gain value h fe of 50 this value determines the amplification capacity of the transistor.

Note: Complete Technical Details can be found in the 2N2219 datasheet given at the end of this page.īC549, BC636, BC639, BC547, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200, 2N5551ĢN2219 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.

Collector-Emitter voltage (V CEO) is 50 V.

Continuous Collector current (I C) is 800mA.

Current Gain (h FE), typically 50 for small signal.

Current Drains out through emitter, normally connected to groundĬontrols the biasing of transistor, Used to turn ON or OFF the transistorĬurrent flows in through collector, normally connected to load

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