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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: Am I missing something here?
You can have up to 3 types of configurations. To distinguish collector from emitter, you look at the voltage shown in the diode function with the one successful test that found the base.
Try not to touch the transistor while testing it because temperature will change the voltage readings.
Javier Loureiro 1 7 It can be even datasehet, since the On Semi PN has the conventional pinout, despite being the same manufacturer and mostly same specifications: This is the picture of the datasheet for the pins: To confirm, you can double check with the hFE function if your meter has that.
The hFE is usually much higher when properly connected than when collector and emitter are swapped. I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA:.
What do you think? The base will show a diode connection to both other pins, in only one polarity. Would you like to answer one of these unanswered questions instead?
KN2222 Datasheet PDF
Most 2Ns have the orientation which your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively. Home Questions Tags Users Unanswered. Spehro Pefhany k 4 This is true of almost all modern transistors a few are made more symmetrical. You have to try each of the three pins to the two others, with both polarities 6 pairs of tests.
No other pin will show that. The situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all.
The datasheef lower of the two voltages will correspond to the collector-base junctionand the other will be the fatasheet junction.
It looks like a “diode”. I don’t think so – throw it in the bin.
KN Datasheet(PDF) – KEC(Korea Electronics)
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 If I k2222 up the circuit for a quick test, it seems that the datasheet or the transistor has the pins swapped. I am trying to figure out what is going on on2222. 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.
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 dataheet bonus does not count.
Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting. Hence the 2N pin-out is sadly not standardized. Thank you for your interest in this question.
This is the pic of the kn222, 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.