Symbol. Parameter. Value. Unit. VCBO. Collector-Emitter Voltage (IE = 0). V. VCEO. Collector-Emitter Voltage (IB = 0). V. VEBO. Emitter-Base Voltage (IC. SMBT A. 1. Oct NPN Silicon Switching Transistor. • High DC current gain: mA to mA. • Low collector-emitter saturation voltage. Datasheet contains the design specifications for product development. Datasheet contains preliminary data; supplementary data will be.

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2NA Pinout, Features, Equivalent & Datasheet

I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor datasyeet. If I set up the circuit for a quick test, it seems that the datasheet or the transistor has the pins swapped.

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.

It looks like a “diode”. 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. Hence the 2N pin-out is sadly not standardized. Most 2Ns have the 22222a which your diagram shows, dataseet if the flat side is facing you, the pins are E-B-C respectively.


You have to try each of the three pins to the two others, with both polarities 6 pairs of tests. The base will show a diode connection to both other pins, in only one polarity.

No other pin will show that. 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 datasbeet voltage readings. The slightly lower of the two voltages will correspond to datazheet collector-base junctionand the other will be the emitter-base junction.

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

To confirm, you can double check with the 2222z function if your meter has that. The hFE is usually much higher when properly connected than when collector and emitter are swapped.

If it is to replace dayasheet shorted transistor, we will never know if both are the same ebc configuration between your new 2N and the old 2N The situation worsen when all these china fake transistors crowded the whole market, there are no standardization at all. You can have up to 3 types of configurations. Thank you for your interest in this question.


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I am trying to figure out what is going on here. I have a simple circuit to send current to a brushless fan running at 12V on the high side, using a NPN transistor 2NA: This is the picture of the datasheet for the pins: What do you think? Am I missing something datashet Javier Loureiro 1 7 Zuofu 3, 2 15 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. Would I reuse it? I don’t think so – throw it in the bin. It can be even worse, since the On Semi PN has the conventional pinout, despite being the same manufacturer and mostly same specifications: Spehro Pefhany k 4