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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 situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all. Am I missing something here?

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 base will show a diode connection to both other pins, in only one polarity.

Korea Electronics (KEC) – datasheet pdf

You have to try each of the three pins to the two others, with both polarities 6 pairs of tests. Spehro Pefhany k 4 I don’t think so – throw it in the bin. What do you think? I am trying to figure out what is going on here.


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

Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting. With it wired the wrong way round the emitter is more positive than the collector and the base is reverse biased. Zuofu 3, 2 15 I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA: Would you like to answer one of these unanswered questions instead?

This is the picture of the datasheet for the pins: Home Questions Tags Users Unanswered. Hence the 2N pin-out is sadly not standardized.

Korea Electronics (KEC)

If I set up the circuit for a datashdet test, it seems that the datasheet or the transistor has the pins swapped. Javier Loureiro 1 7 Thank you for your interest in this question. Most 2Ns have the orientation which your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively.

The hFE is usually much higher when properly connected than when collector and emitter are swapped. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

KN2222 Datasheet, Equivalent, Cross Reference Search

No other pin will show that. It can be even worse, since the On Semi PN has the conventional pinout, despite being the same manufacturer and mostly same specifications: You can have up to 3 types of configurations.


The slightly lower of the two voltages will correspond to the collector-base junctionand the other will be the emitter-base junction. I have a simple circuit to send current to a brushless fan running at datsheet on the high side, using a NPN transistor 2NA:.

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. 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 jn2222and the transistors gets pretty hot.

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 It looks like a “diode”. Would I reuse it?

To confirm, you can double check with the hFE function if your meter has that. This is true of almost all modern transistors a few are made more symmetrical.