2222A TRANSISTOR PDF
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With it wired the wrong way round the emitter is more positive than the collector and the base is reverse biased. Single transistors are also available in several different surface mount packages, and a number of manufacturers market surface mount packages that incorporate several 2Ntype transistors in one package as an array of transistors.
2NA Pinout, Features, Equivalent & Datasheet
No other pin will show that. Typical examples are the well known NPN and PNP industrial and military types, 2N and 2N, which have been used for over four decades and are still being used in many designs.
Other part numbers will have different parameters. Spehro Pefhany k 4 Most 2Ns have the orientation which your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively.
JEDEC registered parameters include outline dimensions, small-signal current gaintransition frequencymaximum values for voltage withstand, current rating, power dissipation and temperature rating, and others, measured under standard test conditions. When I apply a voltage between the pin 1 to 3, as soon as the voltage rises over about 8V, the current starts to flow, even when the base has no voltage pulled down or floatingand the transistors gets pretty hot.
Because trnasistor has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. The slightly lower of the two voltages will correspond to the collector-base junctionand the other will be the emitter-base junction.
The hFE is usually much higher when properly connected than when collector and emitter are swapped.
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 is the pic of the transistor, as I understand that it should work, but it doesn’t it is always ‘on’ with 12V between the collector and the emitter with the base floating.
I have used a base voltage of 5V and a value of 1K as current limiting resistor. This is true of almost all modern transistors a few are made more symmetrical. Complete Technical Details can be found at the 2NA datasheet given at the end of this page.
Commercial transistors Bipolar transistors. It is frequently used as a small-signal transistor,   and it remains a small general purpose transistor  of enduring popularity. This page was last edited on 25 Octoberat The value for this resistor can be calculated using the formula.
The general specifications of the various variants are similar, with the biggest difference being the maximum allowable current and power dissipation.
2N 2221A/ 2222A
The exact specifications depend on the manufacturer, case type, and variation. This transistor will make it forward biased and thus closes the connection between collector and emitter. When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter. The 2N is considered a very common transistor,    and is used as an exemplar of an NPN transistor. It looks like a “diode”. Replacements for the 2N are commonly available now in the cheaper TO packaging, where it is known as the PN or P2N, which has similar specifications except for the lower maximum collector current.
High frequency and microwave engineering. Retrieved 26 March To bias a transistor we have to supply current to base pin, this current I B should be limited to 5mA. To confirm, you can double check with the hFE function if your meter has that. I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA: I am trying to figure out what is going on here.
This is transietor picture of the datasheet for the pins: Billions of units have been manufactured over the past 45 years and there is continuing high volume annual production. In other projects Wikimedia Commons.
2N A/ A — Transistors | Manufacturer | Continental Device India Ltd (CDIL)
Would I reuse it? To distinguish collector from emitter, you look at the voltage shown in the diode function with the one successful test that found the base. The situation worsen when all these china fake transsistor crowded the whole market, there are no standardization at all.
You can have up to 3 types of configurations. Wikimedia Commons has media related to 2N The 2N exhibits its forward gain beta peak at a lower current than the 2N, and is useful in amplifier applications with reduced I ce.