The voltage from the collector terminal to the base is 75V once the emitter terminal is open.The voltage from the emitter to the base terminal is 6V once the collector terminal is open.The voltage from collector terminal to emitter is 50V once the base terminal is open.The features & specifications of the 2N2222 NPN transistor include the following.
Pin3 (Emitter): The emitter pin is the third pin of the transistor & it is used to drain out the complete current of the transistor.The main function of this pin is to control the current from emitter to base. Pin2 (Base): The base pin is a control pin & it is a second pin of the transistor.The main function of this pin is to provide transistor current toward the o/p load. Pin1 (Collector): This is the first pin of the transistor & it is an o/p pin.This transistor includes three pins & its each pin functionality is discussed below. The pin configuration of the 2N2222A transistor is shown below. It functions on the value of high transition frequency like 250MHz through 10ns delay time, 225ms storage time, 60ms fall time & 25ms rise time. Try increasing base current to maybe 10mA.2N2222A transistor offers constant DC collector current like 800mA, so it is necessary to use where low to medium current is necessary. This is okay, and the transistor will be fine!īUT, back to the saturation range, if you increase your collector-emitter current you will move further right on the graph, look at how far right the 500mA graph is, at 500mA your 2mA base current would create a huge voltage drop across collector-emitter! This means that at motor startup, or if you increase motor current too much you will have a dramatic heating in the transistor, probably welding collector-emitter to a short-circuit! If you look at the graph for 150mA you will see that with 2mA base current you will have a Vce (collector-emitter) of about 0.15 V, which is probably okay since you will have very low power dropped, 0.15V * 0.15A = 0.0225 W.Īlso in the data sheet you can see that the transistor will heat up 200 ☌ per Watt dissipated.Ġ.0225 * 200 = 4.5 ☌. Now look at the table from the data sheet about the Collector Saturation Region. You have put a 2k2 resistor with 5V on your base, you will drop about 0.7V from base to emitter, that means that there will run about (5 V - 0.6 V) / 2200 = 2mA through your base. can someone please explain to me what im experiencing here? thanks my base resistor which i blindly picked from the 2k200 OHM pile is connected to a 5VDC Source along with a 10kOHM pull_down resistor on the base of the transistor. this is especially true if i cold start the motor at 20 or higher volts. On the motor i have a flywheel diode and a filtering cap however if i raise the voltage about 19.0 volts something happens to the transistor and it seems as if it shorts to the on position because when i pull the base low the motors is still running and the transistor begins to heat fast. letting the motors run at 12V for numerous hours consuming. So just for fun i hooked up a 12VDC motor that according to my "RIGOL DP832A Programmable Power supply" is consuming about. Focusing on transistors, more specifically the "ON Semiconductor P2N2222A NPN" According to the specs here the transistor has a maximum emitter voltage of 40VDC and a collector current rated at 600mA. Right now i'm tinkering with MOSFETS and NPN Trainsistors.
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