It can also be used in various switching applications.Can be used to switch high-current (up to 800mA) loads.Note that the motor here draws about 500mA from the 12V power source, since the 2N2222 has a collector current rating up to 800mA this circuit is possible had it been a BC547 the transistor should have been burnt. I have used a base voltage of 5V and a value of 1K as the current limiting resistor. In actuality circuit modifications might be required. To make things simple, I have shown a simplified circuit to make a transistor switch. BC547 transistor’s first pin is collector, second is base and third is Emitter while the 2N2222 transistor’s first pin is emitter, second is base and third is Collector. The value for this resistor can be calculated using the formula R B = V BE / I B By looking at the above pin comparison image above we can understand that pin configuration of both the transistors are different. As the name suggests this resistor will limit the current flowing through the transistor to prevent it from damaging. However, one important thing to notice is the Base resistor a.k.a current limiting resistor. This transistor will make it forward-biased and thus close the connection between the collector and emitter. 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 like all can be used either as a switch or as an amplifier. So if you looking for an NPN transistor that could switch loads of higher current, then 2N2222 might be the right choice for your project. 2N2222 can allow collector current up to 800mA and also has a power dissipation of 652mW which can be used to drive larger loads than compared with BC547. But there are two important features that distinguish both. The 2N2222 transistor is very much similar to the commonly used NPN transistor BC547. When the base current is removed the transistor becomes fully off, this stage is called the Cut-off Region, and the Base Emitter voltage could be around 660 mV. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V CE) or Base-Emitter (V BE) could be 200 and 900 mV respectively. When this transistor is fully biased, it can allow a maximum of 800mA to flow across the collector and emitter. To bias a transistor we have to supply current to the base pin, this current (I B) should be limited to 5mA. 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. 2N2222A has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. 2N2222 Brief DescriptionĢN2222 is an NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at the ground and will be closed (Forward biased) when a signal is provided to the base pin. Note: Complete Technical Details can be found in the 2N2222A datasheet, given at the end of this page. High power and current handling capabilityĭetailed Specifications:- Transistor Polarity.Note that in your specific case, the code you're looking for is probably just "331". ![]() ![]() If the manufacturer no longer exists, or has gotten bought up by another company decades ago, you're probably just out of luck. ![]() If they don't, you'd have to contact the manufacturer and ask. Even if you do know the manufacturer, these codes are meant mostly for the manufacturer's internal reference, so they might not be explained on the datasheet. There is no standard, so without knowing the manufacturer, you're out of luck. But fitting that along with the part number on a TO-92 or TO-18, let alone a SOT-23 or SC-70, is pretty tough, so other codes are used instead. On parts with more room than a TO-92 or TO-18 provides, you might get a one-digit factory code for which factory the part was made in, combined with a four-digit date code consisting of the last two digits of the year and two digits indicating which week of the year it was made in. The usual practice is to put some manufacturer-specific code that identifies which lot the device came from.
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