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Can a 2N2222 be used as a switch?
Attempt to use 2n2222 as a switch, but it seems to work below 5v (all the way down to < 1v). Why? I have the circuit drawn below and I’m expecting the circuit to only light the LED when 5v appears on the base.
How many pins are in a 2N2222 NPN transistor?
Pin Configuration of 2N2222 NPN Transistor: This 2N2222 NPN transistor has three pins emitter, base, and collector. These pins are used in the circuit for turning on or off the transistor.
What is the DC collector current of 2N2222?
2N2222 provides continuous dc collector current is 800mA. It means it has a high collector therefore it is mostly used in that circuits where low to medium current is required. It works on high transition frequency value 250MHz with delay time 10ns, rise time 25ms, storage time 225ms and fall time 60ms.
What’s the fall time of a 2N2222 transistor?
It works on high transition frequency value 250MHz with delay time 10ns, rise time 25ms, storage time 225ms and fall time 60ms. It is friendly to use and easily available online market in a TO-92 package.
How is the collector current calculated on a 2N2222?
On the 2N2222, you must first determine what your collector current is–then divide that by a factor of 10 or 20 (depending if you live in US or UK–differing conventions LOL). This calculates how much base current you need to fully turn on the transistor without wasting excess battery power–then calculate the proper value of the pull-up resistor.
When does a transistor switch to saturation voltage?
The datasheet spec’s its saturation voltage loss (max voltage created between collector and emitter when it is saturated) only when its base current is 1/10th its collector current. But every transistor is different. A few might switch when their base current is 1/50th the collector current.
How to use a transistor as a switch?
If your microcontroller can supply 20mA at 4V then the transistor can switch 200mA and its base voltage will be about 0.8V. Then the base resistor has 3.2V across it and Ohm’s Law calculates its value to be 3.2V/20mA= 160 ohms.