![]() It can also amplifies the power and current. This transistor is used where low power amplification is needed. There are three configuration used in an amplifier circuit are common emitter, common base, common collector. When its base is connected to ground, it will allow high current (600mA) to pass through collector to emitter, that’s how it amplifies the current. When use as a amplifier, can be operated in the active region. So, from that you can find the value of resistance to be added in series with it. The maximum value of providing base current is 200mA. Where, the value of V BE will be 5v for this transistor. For finding the value of that resistor, you can use the formula: For the protection of transistor, a resistance added in series with it. ![]() If supply is provided to the base pin, it stops conducting current between emitter and collector and said to be in OFF state. If we provide ground to the base pin, then the transistor will be in reverse biased and said to be turn ON. In PNP transistor, by default it’s in ON state, but not to be said perfectly on until the base pin is not grounded. When use as a switch, can be operated in saturation region and cut-off region. While the base current is removed the transistor is in off state it’s in Cut-off region. When the transistor is fully biased, it allows a maximum of 500mA current through the collector and provide a voltage (collector to emitter) of 1.6v (max.), this is the Saturation region of the transistor. As it is used for the amplification and switching. The transistor is having DC current gain value of 100 to 300 which shows the amplification capacity of the transistor. The condition of being forward biased is when the base connected to the ground or having no supply on it, and as a signal is provided to base pin it goes reverse biased. This is a Bipolar PNP transistor available in metal can package, having a high value of current 600mA with low voltage of 40v. Note: Complete technical information can be found in the 2N2907 Datasheet, linked at the bottom of this page. Temperature of operation and storage is -65 to +150 ☌.Having DC current gain (hfe) of 100 to 300 (max.). ![]() ![]()
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