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Home Questions Tags Users Unanswered. 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.

Datasheet «KN2222»

To distinguish collector from emitter, you look at the voltage shown in daatasheet diode function with the one successful test that found the base. I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA: You can have up to 3 types of configurations. With it wired the wrong way round the emitter eatasheet more positive than the collector and the base is reverse biased.

Spehro Pefhany k 4 The slightly dztasheet of the two voltages will correspond to the collector-base junctionand the other will be the emitter-base junction.


I don’t think so – throw it in the bin. It looks like a “diode”. It can be even worse, since the On Semi PN has the conventional pinout, despite being the same manufacturer and mostly same specifications: This is true of almost all modern transistors a few are made more symmetrical.

KN Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

No other pin will show that. Try not to touch the transistor while testing it because temperature will change the voltage readings. Javier Loureiro 1 7 Would you like to answer one of these unanswered questions instead?

Hence the 2N pin-out is sadly not standardized. I am trying to figure out what is going on here. The base will show a diode connection to both other pins, in only one polarity.

This is the picture of the datasheet for the pins: What do you think? Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting. Most 2Ns have the orientation which your diagram shows, where if dtaasheet flat side is facing you, the pins are E-B-C respectively.

The situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all. Thank you for your interest in this question.

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. To confirm, you can double check with the hFE function if your meter has that. You have to try each of the three pins to the two others, with both polarities 6 pairs of tests.


I have a simple circuit to send current to a brushless fan running at 12V 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.

If I set up the circuit for a quick test, it seems that the datasheet or the transistor has the pins swapped.

Would I reuse it? If it is to replace a shorted transistor, we will never know if both are the same ebc configuration between your new 2N and dztasheet old 2N By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Am I missing something here? Zuofu 3, 2 15