NPN Silicon Epitaxial Planar Transistor for. Switching and Amplifier Applications. • RoHS compliance. Mechanical Data. Case: SOT, Plastic Package. The 2N is a common NPN bipolar junction transistor (BJT) used for general purpose depend on the manufacturer, case type, and variation. Therefore, it is important to refer to the datasheet for the exact part number and manufacturer. PNA. SMALL SIGNAL NPN TRANSISTOR. PRELIMINARY DATA s. SILICON EPITAXIAL PLANAR NPN. TRANSISTOR s. TO PACKAGE SUITABLE FOR.

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So if you looking for an NPN transistor that could switch loads of higher current then 2NA might the right choice for your project.

It is very similar to a mechanical switch but here we will control the switch using electric signals. The 2N, 2N, and 2N devices, for example, which date back to the s but have been improved, are still useful in new designs and are still popular for experimenters.

Learn to keep an eye open for the following transistors, as they’re among the most useful, inexpensive, and popular types: Normally this type of transistor will either be used as a switch or as an amplifier, both of which is discussed below. Other part numbers will have different parameters. Hence the 2N pin-out is sadly not standardized. Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting.

The resistor R1 is called the Base resistor dafasheet is very important to drive a transistor, it limits the base current and failing to use one might damage the transistor permanently. It is used in a variety of analog amplification and switching applications. The 2N is an NPN transistor that can only switch one-third the current of the 2N but has otherwise similar characteristics.


The 2N is considered a very common transistor, [1] [2] [3] and is used as an exemplar of an NPN transistor. High frequency and microwave engineering. The transistor will begin to conduct when the voltage across the Base and Emitter pin exceeds 0. In other projects Wikimedia Commons. I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA:.

The value for this resistor can daatsheet calculated using the formula.

ST Microelectronics – datasheet pdf

Am I missing something here? Graf and William Sheets The slightly lower of the two transisotr will correspond to the collector-base junctionand the other will be the emitter-base junction.

But there are two important features that distinguish both. I have used a base voltage of 5V and a value of 1K as current limiting resistor. I am trying to figure out what is going on here.

Because it 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. Since its initial dafasheet launch by Motorola at the IRE Convention, the 2N has become the most widely used and universally recognized transistor of all time. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region. Would you like to answer one of these unanswered questions instead?

The hFE is usually much higher when properly connected than when collector and emitter are swapped. 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.


One of the most default and primary function of a transistor is to act as a switch. When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter.

It looks like a “diode”. Transistor as Amplifier Another Common application of a Transistor is as amplifiers. The resistor R2 is used to limit the trnasistor though the collector of the transistor and is not mandatory.

Retrieved 26 March However one important thing to notice is the Base resistor a. Retrieved from ” https: So if you looking for an NPN transistor that could switch loads of higher current then KSPA might the right choice for your project.

ST Microelectronics

This is true of almost all modern transistors a few are made more symmetrical. By using this site, you agree to the Terms of Use and Privacy Policy.

Therefore, transisto is important to refer to the datasheet for the exact part number and manufacturer. Complete Technical Details can be found at the 2NA datasheet given at the end of this page.

Another Common application of a Transistor is as amplifiers. Submitted by webmaster on 11 December By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

To make things simple I have shown a simplified circuit to make a transistor as switch. Spehro Pefhany k 4