PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state. It is designed for…ĢN3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be close… The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. It is designed for low electric current and power and medium voltage, and can operate at moderately high speeds. PNP bipolar junction transistorThe 2N3906 is a commonly used PNP bipolar junction transistor intended for general purpose low-power amplifying or switching applications. The maximum amount of current that could flow through the Collector pin is 800mA, hence we cannot connect loads that consume more than 800mA using this transistor. How much current can a 2N2222 transistor handle?ĢN2222A has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. You need a PNP bipolar Junction transistor.Įmitter-Base Voltage Vebo of 2N3904 is 6V. And then the diode there that makes up part of the transistor. And then the diode there that makesMoreLike this switch this switch is more positive and the resistor. YouTubeYouTubeStart of suggested clipEnd of suggested clipLike this switch this switch is more positive and the resistor. These transistors are available in package styles TO-92, SOT23, SOT223 with different prefixes.Ġ:0017:56NPN BJT switch using 2N3904 bipolar junction transistor circuit … – The 2N3904 (NPN) and 2N3906 (PNP) are complementary transistor pairs. NPN bipolarThe 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It can operate between -65 C to 200 C temperature. The Collector to Base, Emitter to Base, and Collector to Emitter voltage ratings of 2N2222 and 2N2222A are 60V, 30V, 5V, and 75V, 40V, 6V respectively. What are 2N2222 and 2N2222A Transistors? Both transistors are from the same family but the 2N2222A has higher Maximum absolute ratings than 2N2222. What is the difference between 2N2222 and 2N2222A? The 2N2222 and BC547 transistors are both general-purpose transistors that are frequently used in electrical circuits the BC547 transistor is one of the best transistor equivalents for the 2N2222 transistor. Which transistor can be used in place of 2N2222? The 2N3904 is an extremely popular NPN transistor that is used as a simple electronic switch or amplifier that can handle 200 mA (absolute maximum) and frequencies as high as 100 MHz when used as an amplifier. 2N3904 has a gain value of 300 this value determines the amplification capacity of the transistor. In simple terms, this effectively means that 40V is the maximum amount of voltage that the transistor can handle minus the voltage drop across the load connected to the collector.ĢN3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. For most circuits, a 2N3904 would suffice, however, if you need more above 200mA, a 2N2222 should be used instead.īoth the 2N3904 and 2N2222 are identical in terms of handling collector-to-emitter voltages, and both can handle voltages of up to 40V. The 2N2222 is the one to choose if you require more than 200mA but not more than 1A. The 2N3904 or 2N2222 will suffice if you require less than 200mA. In your circuit higher gain is better, but 100 is plenty enough.īecause the collector current of the 2N3904 is 200mA and the collector current of the BC547 is 100mA, you can replace the 2N3904 with BC547 if the load you’re driving is less than 100mA, but you can’t use BC547 if the load is greater than 100mA. Any substitute that is within or close to that range should be fine (assuming the circuit was designed to accommodate such a wide variation). Whereas the 2N2222 is optimized to reach its highest gain at currents of around 150 mA, the 2N3904 is optimized for currents of around 10 mA.Īt 10mA Collector current the 2N3904’s current gain could be anywhere between 100 and 300. What is the difference between the 2N2222 and 2N3904? It can amplify power, voltage and current at different configurations. A Transistors acts as an Amplifier when operating in Active Region. Where, the value of VBE should be 5V for 2N3904 and the Base current (IB depends on the Collector current (IC).
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