Compute the current for base Ib : IbIc/10 Ib100/10 Ib 10mA Compute the Rb : Rb (VCC - Vbe) / Ib Rb (4 - 0. I see on the stackexchange that IbIc/10 to force full saturate the transistor. The dimension of the SOT-23 Package is shown below. I use 2N3904 as switch to power off/on the NEO-6M module control by Atmega328p. If you are looking for a through hole type then consider 2N3904. The BT3904 is an SMD Transistor and is available in SOT-23 Package. ![]() Commonly used in TV and other home appliances.VCB and VBE is high hence can be used to control voltage loads up to 40V.It is mostly used by electronic students and hobbyists in their projects, but it is also used in. Amplifier modules like Audio amplifiers, signal Amplifier etc. 2N3904 is a widely used general purpose transistor.Driver Modules like Relay Driver, LED driver etc. According to 2N3904 datasheet this transistor is a silicon epitaxial planar NPN general purpose amplifier and switch.When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 600 mV. ![]() This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (VCE) or Collector-Base (VCB) could be 40V and 60V respectively. Good cheap general-purpose switching TO-92 cased transistors to have around. The 2N7000 N channel MOSFET turns on with logic level voltage and can switch 60V & 500mA and costs 3/100. When this transistor is fully biased then it can allow a maximum of 200mA to flow across the collector and emitter. The 2N3904 is a good general-purpose NPN BJT xstr 40V & 200mA but the 2N2222A is 40V & 800mA and is 1/100. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. ![]() The maximum amount of current that could flow through the Collector pin is 200mA, hence we cannot connect loads that consume more than 200mA using this transistor. BT3904 has a maximum gain value of 300 this value determines the amplification capacity of the transistor. Note: The complete technical information can be found at the datasheet given at the end of this page.īC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055, 2N3906, 2SC5200īT3904 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. Collector to Emitter Voltage (VCE) is 40V.Continuous Collector Current (Ic) is 200mA.It can be used as small signal switching transistor. The MMBT3904 is and SMD package NPN Transistor with V CE of 40V and a collector current of 200mA. 2N3904 Silicon NPN Transistor NPN, 60V, 0.02A, 0.
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