It is designed for low to medium current , low power , medium voltage , and can operate at moderately high speeds. It was originally made in the TO metal can as shown in the picture. The 2N is considered a very common transistor,    and is used as an exemplar of an NPN transistor. It is frequently used as a small-signal transistor,   and it remains a small general purpose transistor  of enduring popularity. The JEDEC registration of a device number ensures particular rated values will be met by all parts offered under that number. JEDEC registered parameters include outline dimensions, small-signal current gain , transition frequency , maximum values for voltage withstand, current rating, power dissipation and temperature rating, and others, measured under standard test conditions.
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Note: Complete Technical Details can be found at the 2NA datasheet given at the end of this page. The maximum amount of current that could flow through the Collector pin is mA, hence we cannot connect loads that consume more than mA using this transistor. To bias a transistor we have to supply current to base pin, this current I B 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 and the Base Emitter voltage could be around mV. But there are two important features that distinguish both. So if you looking for an NPN transistor that could switch loads of higher current then 2NA might the right choice for your project.
This transistor like all can be used either as a switch or as an amplifier. The Base-Emitter voltage of this transistor is 6V so you just have to supply this voltage across the base and emitter of the transistor to induce a base current into the transistor. This transistor will make it forward biased and thus closes the connection between collector and emitter.
However one important thing to notice is the Base resistor a. As the name suggests this resistor will limit the current flowing through the transistor to prevent it from damaging. The value for this resistor can be calculated using the formula. To make things simple I have shown a simplified circuit to make a transistor as switch.
In actual circuit modifications might be required. I have used a base voltage of 5V and a value of 1K as current limiting resistor. Note that the motor here draws about mA from the 12V power source, since the 2N has collector current rating upto mA this circuit is possible had it been a BC the transistor should have been burnt.
Subscribe to stay updated with industry's latest Electronics components and news. How to use 2NA This transistor like all can be used either as a switch or as an amplifier.
Applications Can be used to switch high current upto mA loads It can also be used in the various switching applications. Component Datasheet.
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