![]() When this transistor is fully biased then it can allow a maximum of 100mA to flow across the collector and emitter. To bias a transistor we have to supply current to base pin, this current (I B) should be limited to 5mA. The maximum amount of current that could flow through the Collector pin is 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. Note: Complete Technical Details can be found at the BC547 datasheet given at the end of this page.īC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200īC547 transistor has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. Continuous Collector current (I C) is 100mA.If you are designing a PCB or Perf board with this component, then the following picture from the Datasheet will be useful to know its package type and dimensions.BC547 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. ![]() ![]() Modulator and Demodulator for RF frequency.To resolve this issue, we need to add pulldown resistors, for example in the above case, a 10K resistor is used to pull down the base of the transistor.īC108 Transistor is a very versatile device, its high frequency range and large bandwidth makes it suitable for many different applications. The base of the transistor cannot be left floating otherwise there could be false triggering to the transistor which may lead to issues in the circuit. When we turn on the transistor by supplying a required current to the base of the transistor, it will remain on, unless the voltage at the base of the transistor reaches zero. The simulated circuit below shows how this transistor behaves, when a base current is applied and when no current is provided to the base. BC550 is an NPN transistor that means it will be left open when no current is applied to its base, but when we apply a base voltage the transistor will turn on. Unlike MOSFETs, transistors are current controlled devices, means they can be turned on or off by supplying required base current (for BC180 transistor it is 2mA). When a positive voltage is applied to the base, holes are created to the base, so they start migrating to the emitter junction, this process thins out the depletion region from the PN junction and more and more electrons start flowing and are collected by the collector. In an NPN transistor, electrons work as the primary charge carriers and are emitted from the emitter of the transistor to the PN junction. Depending upon the construction, transistors are divided into two categories - NPN transistor and PNP transistor as shown below. The BC108 Transistor is a general-purpose N-P-N transistor, A junction transistor is simply a sandwiched construction between two layers of N-type material or P-type material. Note: Complete technical information can be found in the BC108 Datasheet, linked at the bottom of this page.īC547, BC548, BC549, 2n3904, BC107, 2N2222, 2N3053, 2N2907, BC177B Operating and Storage Junction Temperature Range -65 to +175 ☌.Operating Junction Temperature Max (Tj): 175 ☌.Maximum Collector-Base Voltage |Vcb|: 30 V’.Continuous Collector current (IC) is 200mA.As you already may know, a transistor is a current controlled device so when the base current is removed, the transistor becomes fully off, in this stage the transistor is working in its Cut-off Region and the Base Emitter voltage could be around 660mV.Įlectrons emitted from the emitter into the first PN junctionĮlectrons Emitted from Emitter Collected by the Collector When this transistor is in biased condition, then it can allow a maximum current of 200mA across CE(Collector Emitter) Junction, this state of the transistor is called the saturation state and driving a load that consumes more current than 200mA may damage the device in this condition. This transistor has a collector-emitter voltage of 30V and a collector base voltage of 5V. The maximum collector current of this transistor is rated at 200mA with a maximum emitter-base voltage of 5V. The gain value can differ depending upon the manufacturer, so it's highly recommended to check out the datasheet of the specific device before you do the calculation. To use this transistor as an amplifier, you need to get the gain value from the datasheet of the device. The BC108 is an NPN Transistor, hence we need to provide a small amount of positive voltage to the base of the transistor and then only the required amount of current flows through the base of the transistor. BC108 is a generic semiconductor device that can be used to amplify or switch signals or power.
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