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Am I missing something here? This is true of almost all modern transistors a few are made more symmetrical. It can be even worse, since the On Semi Ln2222 has the conventional pinout, despite being the same manufacturer and mostly same specifications: Javier Loureiro 1 7 The situation worsen dafasheet all these china fake transistors crowded the whole market, there are no standardization at all. You can have up to 3 types of configurations.
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 distinguish collector from emitter, you look at the voltage shown in the diode function with the one successful test that found the base.
Home Questions Tags Users Unanswered. Would you like to answer one of these unanswered questions instead? Absolute maximum rating for emitter-base voltage is 6V hence the E-B junction broke down and started conducting. Dtaasheet hFE is usually much higher when properly connected than when collector and emitter are swapped.
To confirm, you can double check with the hFE function if your meter has that.
What do you think? No other pin will show that. 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 floating datashdet, and the transistors gets pretty hot.
KN Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
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 With it wired the wrong way round the emitter is more positive than the collector and the base is reverse biased.
Spehro Pefhany k 4 Hence the 2N pin-out is sadly not standardized.
KN2222 Datasheet PDF
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 12V on the high side, using a NPN transistor 2NA:. Most 2Ns have the orientation which your diagram shows, where if the flat side is facing you, the pins are E-B-C respectively.
I don’t think so – throw it in the bin. Would I reuse it? This is the picture of the datasheet for the pins: You have to try each of the three pins to the two others, with both polarities 6 pairs of tests. Thank you for your interest in this question. Zuofu 3, 2 15 It looks like a “diode”. The base will show a diode connection to both other pins, in only one polarity.
I am trying to figure out what is going on here. 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.