These structures are more compact than a usual transistor and can save space in electronics projects. Another structure places the base, collector, and emitter prongs all on one side of the large rectangular base with a fourth, larger collector prong on the opposing side. One structure can place the base and emitter prongs on one side of a large rectangular base with the collector prong on the other. Alternative structures have dramatically shorter prongs than normal transistors. The PN2222A can be structured differently from the traditional transistor “jellyfish” shape, where three prongs extend downward from a solid base. Taking into account NPN variations, PNP complementary types, and transistors that function similarly, this overview can be applied to more than a dozen transistors. Its PNP complementary type, which can function similarly, is PN2907A. The PN2222A is commonly called a small signal transistor due to its low energy applications. It has an extremely low switching delay time of 10 nanoseconds, potentially as low as 5 nanoseconds, which has likely contributed to its continued popularity. The component can dissipate 625 mW of power, giving it good thermal control for not being a MOSFET, which is designed for thermal dissipation. It is an NPN type transistor with an operating temperature range of -55 to 150 degrees Celsius. Like most transistors, the PN2222A can function as a transistor, switch, or amplifier. There are many transistors with different names that are almost functionally identical to the PN2222A. The PN2222A is equivalent to the 2N2222A, and the names are often used interchangeably among the electronics community. Depending on the datasheet, it is characterized as a transistor or an amplifier, but it can perform both of those functions. The PN2222A, also known as the PN2222, is a general-purpose transistor best suited to applications that don’t require high stress on the component. The reason is due to the current gain in reverse-active is much lower than the forward-active.Variants of the PN2222A in the Ultra Librarian search engine. If that is the case, you either lower down the base resistor or increase the pull-up resistor on the 3.3V leg to keep it low. In this configuration, the problem is normally that the low output voltage on the 3.3V leg may be a bit high. When only SW2 is closed, the transistor will be in reverse-active, i.e., the charges flow from emitter to collector. When only SW1 is closed, the transistor will be in forward-active, i.e., the charges flow from collector to emitter (you can see this animated in the simulator). It works because the BJT can operate not only in forward-active mode, but also in reverse-active mode. Watch the voltages on the voltmeters when you play around with the switches. You can switch them on/off in real-time to see the effect. I have created a circuit that runs under Falstad Circuit Simulator. To prove that, you can either build it yourself a prototype or simulate it. It is useful if you don't have MOSFET handy (like what the OP had encountered) and need a quick solution. I know it is an old question, but I want to point out that BJT transistor can work just fine except that it might not be as efficient or as fast as the low VG(th) MOSFET solution.
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