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I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA: When I apply a voltage between the pin 1 to 3, as datasheett 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.

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KN 데이터시트(PDF) – KEC(Korea Electronics)

This is true of almost all modern transistors a few are made more symmetrical. If I set up the circuit for a quick test, it seems that the datasheet or the datasheet has the pins swapped.

It looks like a “diode”. Thank you for your interest in this question. 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 situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all. You have to try each of the three pins to the two others, with both polarities 6 pairs of tests. Am I missing something here? No other pin will show that.

Home Questions Tags Users Unanswered. Most 2Ns have the orientation datashfet your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively.

What do you think? Would you like to answer one of these unanswered questions instead? Would I reuse it? Hence the 2N pin-out is sadly not standardized. The hFE is usually much higher when properly connected than when collector and emitter datashest swapped. This is the picture of the datasheet for the pins: Zuofu 3, 2 15 To confirm, you can double check with the hFE function if your meter has that.

Korea Electronics (KEC)

I don’t think so – throw it in the bin. You can have up to 3 types of configurations. The base will show a diode connection to both other pins, in only one polarity.

Datashet distinguish collector from emitter, you look at the voltage shown in the diode function with the one successful test that found the base. Javier Loureiro 1 7 It can be even worse, since the On Datashedt PN has the conventional pinout, despite being the same manufacturer and mostly same specifications: With it wired the wrong way round the emitter is more positive than the collector and the base is reverse biased.


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.

The slightly lower of the datasheeg voltages will correspond to the collector-base junctionand the other will be the emitter-base junction. Spehro Pefhany k 4 If it is to replace a shorted transistor, we will never know if both are the same ebc configuration between your new 2N and the old 2N Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting.

I am trying to figure out what is going on here. By datsheet our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Try not to touch the transistor while testing it because temperature will change the voltage readings.