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The hFE is usually much higher when properly connected than when collector and emitter are swapped. Most 2Ns have the orientation which your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively. Datwsheet confirm, you can double check with the hFE function if your meter has that.

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 am trying to figure out what is going on here. Thank you for your interest in this question. Javier Loureiro 1 7 You have to try each of the three pins to the two others, with both polarities 6 pairs of tests. Would I reuse it?

KN Datasheet(PDF) – KEC(Korea Electronics)

When I apply a voltage between the kn22222 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 datqsheet hot. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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The slightly lower of the two voltages will correspond darasheet the collector-base junctionand the other will be the emitter-base datashdet. It can be even worse, since the On Semi PN has the conventional pinout, despite being the same manufacturer and mostly same specifications: I don’t think so – throw it in the bin.

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.

To distinguish collector from emitter, you look at the voltage shown in the diode function with the one successful test that found the base. If I set up the circuit for a quick test, it seems that the datasheet or the transistor has the pins swapped.

(PDF) KN2222 Datasheet download

I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA: 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 This is the picture of the datasheet for the pins: Zuofu 3, 2 15 It looks like a “diode”.

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No other pin will show that. Hence the 2N pin-out is sadly not standardized. Am I missing something here? Home Questions Tags Users Unanswered.

The situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all. With it wired the wrong way round the emitter is more positive than the collector and the base is reverse biased. Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting.

What do you think? Would you like to answer one of these unanswered questions instead? Spehro Pefhany k 4 Try not to touch the transistor while testing it because temperature will change the voltage readings. You can have up to 3 types of configurations. The base will show a diode connection to both other pins, in only one polarity.

This is true of almost all modern transistors a few are made more symmetrical.