To make it less of a hassle, we can insert a toggle switch in the circuit so that we can just toggle the lever of the toggle switch if we want to turn ON or OFF the light bulb, instead of connecting or disconnecting the electrical plug. So to turn ON the light bulb, we’ll insert the electrical plug to the outlet and to turn it off, we’ll disconnect the plug from the outlet. I hope you can imagine it, in reality, the light bulb is connected to the AC mains or wall outlet through an electrical plug and zip-cord. In figure 3, we can see a schematic diagram of a light bulb connected directly to the AC mains. So basically, an SPST toggle switch is simply an ON-OFF switch with two terminals (A & B) that can be connected together or disconnected from each other by toggling the lever (actuator). An SPST switch has one pole and one throw, so it can only control one circuit and its pole can be connected to one terminal only. The number of poles in a switch determines how many separate circuits the switch can control while the throw-count of a switch tells us how many positions each of the switch’s poles can be connected to. In figure 2, you can see a single-pole, single-throw (SPST) toggle switch and the circuit symbol of an SPST switch. *This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information.A switch is an electrical or electronic device that can open or close a circuit, stopping or allowing the flow of current in a circuit. It has a maximum collector current of 600mA and a maximum collector-emitter voltage of 40V. KSP2222A: This is another NPN bipolar junction transistor with a similar package and pinout as 2N3904. PN2222A: This is another widely used general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. It has a maximum collector current of 100mA and a maximum collector-emitter voltage of 30V. It has similar electrical characteristics, including a maximum collector current of 100mA and a maximum collector-emitter voltage of 45V, making it a possible drop-in replacement in certain applications.īC548: This is another general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. Here are a few possible replacements for 2N3904:īC547: This is a general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. It has a maximum collector current of 200mA and a maximum collector-emitter voltage of 40V. Its small size and wide range of applications make it an essential component in many electronic circuits.ĢN3904 is a widely used general-purpose NPN bipolar junction transistor that is commonly used in amplification and switching applications. Overall, the 2N3904 is a widely used transistor due to its low cost, availability, and versatility. Its high transition frequency makes it suitable for use in high-frequency applications, while its low input and output capacitances make it ideal for use in circuits where fast switching is required. The 2N3904 can be used in a variety of electronic circuits, such as amplifiers, switch drivers, and general-purpose switching applications. BJTs onsemi 2N3904 NPN Bipolar Transistor, TO-92 40 V, 0.2 A Obsolete Add to BOM Manufacturer Page Datasheet Price and Stock Distributor links are sponsored See all price breaks » CAD Models Download onsemi 2N3904 symbol, footprint, and 3D STEP models from our trusted partners. Some of the technical specifications of the 2N3904 are:Ĭollector-Emitter Saturation Voltage: 0.2V It is a small signal transistor with a maximum collector current of 200 mA and a maximum collector-emitter voltage of 40 V. NPN silicon epitaxial planar transistor for switching and Amplifier applicationsĢN3904 is a commonly used NPN bipolar junction transistor (BJT) in electronic circuits for amplification and switching applications. BJT MOSFET IGBT SCR MANUFACTURER SITES SMD CODE PACKAGES MOBILE APPS Privacy and cookie policy Disclaimer. The useful dynamic range extends to 100 mA as a. BJT NPN 60Vcbo 40Vceo 6.0Vebo 200mA 625mW 2N3904 TIN/LEAD Central Semiconductor 1: 0.51 8,092 In Stock Mfr. NPN Bipolar Transistor - 2N3904: The 2N3904 is designed as a NPN general purpose amplifier and switch. Mouser offers inventory, pricing, & datasheets for 2N3904 Series NPN Bipolar Transistors - BJT. NPN Silicon Transistor (General small signal application) 2N3904 Series NPN Bipolar Transistors - BJT are available at Mouser Electronics. NPN SILICON PLANAR EPITAXIAL SWITCHING TRANSISTORS
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