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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 The slightly lower of the two voltages datasheer correspond to the collector-base junctionand the other will be the emitter-base junction.
(PDF) KN2222 Datasheet download
I have a simple circuit to send current darasheet a brushless fan running at 12V on the high side, using a NPN transistor 2NA:. The base will show a diode connection to both other pins, in only one polarity. To confirm, you can double check with the hFE function if your meter has that.
Most 2Ns have the orientation which your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively. You can have up to 3 types of configurations. Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting.
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. The situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all. If I set up the circuit for a quick test, it seems that the datasheet or the transistor has the pins swapped.
Home Questions Tags Users Unanswered. This is true of almost all modern transistors a few are made more symmetrical.
What do you think? Would you like to answer one of these unanswered questions instead?
KN Datasheet(PDF) – KEC(Korea Electronics)
The hFE is dwtasheet much higher when properly connected than when collector and emitter are swapped. It looks like a “diode”. No other pin will show that. 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 I reuse it?
KN Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
Am I missing something here? 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.
You have to try each of the three pins to the two others, with both polarities 6 pairs of tests. Hence the 2N pin-out is sadly not standardized. This is the picture of the datasheet for the pins: Thank you for your interest in this question.
Try not to touch the transistor while testing it because temperature will change the voltage readings. To distinguish collector from emitter, you look at the voltage shown in the diode function datasheeg the one successful test that found the base. I don’t think so – throw it in the bin.
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. I am trying to figure out what is going on here. Javier Kn2222 1 7 Zuofu 3, 2 15