# collector current formula

• The collector current, Ic, of a transistor is the amplified output current of a bipolar junction transistor. There are several ways to find the collector current, Ic, of a transistor.

• ## How do I calculate the base and collector current in this

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• So h FE (or hFE) refers to the (total; DC) collector current divided by the base current, and is dimensionless. It is a parameter that varies somewhat with collector current, but is often approximated as a constant; it is normally specified at a typical collector current and voltage, or graphed as a function of collector current.

• The base current must be zero, and hence the collector current must be zero to make this statement true: Vce = Vcc. Plot a Load line graph, with "Ic" against "Vce," to determine the optimum operating voltage using the values: The middle point determines the optimum voltage for the transistor operation.

• Alpha is the relationship of collector current (output current) to emitter current (input current). Alpha is calculated using the formula:                                    α=(∆Ic)/∆IE

• Ico = Reverse current from base to collector. Eliminating I e we are able to develop the following formula: Ic ( 1 – α) – α ⋅ Ib + Ico = 0 Ic = α 1 – α Ib – Ico 1 – α. The factor α / (1 – α) is called Β Beta which is the common emitter current gain. For example if α = 0.98, then the transistor Beta Β can be calculated to be 49.

• • ## How to Calculate the Emitter Current, Ie, of a Transistor

4th Way to Calculate Emitter Current I e. Using Known Values If Ib and Ic are known, Ie can be calculated using the formula: Example If Ic=3.95mA and Ib=50µA, then Ie calculates out to be: Related Resources. How to Calculate the Base Current IB of a BJT Transistor How to Calculate the Collector Current IC of a BJT Transistor

• RC is related to the collector supply VCC and the desired collector current IC which we assume is approximately the emitter current IE. Normally the bias point for VC is set to half of VCC. Though, it could be set higher to compensate for the voltage drop across the emitter resistor RE. The collector current is whatever we require or choose.

• As the emitter current Ie is the sum of a very small base current plus a very large collector current, the value of alpha (α), is very close to unity, and for a typical low-power signal transistor this value ranges from about 0.950 to 0.999. α and β Relationship in a NPN Transistor

• Determine the voltage drop between the collector and emitter junctions (Vce) of the transistor using the formula Vce = Vcc – IcRc, where "Vce" is the collector emitter voltage; "Vcc" is the supply voltage; and "IcRc" is the voltage drop across the base resistor (Rb). Determine the Vcc in a feedback-biased circuit. This can be done using the

• Sep 14, 2018 · COMMON EMITTER CONNECTION | Collector current formula In this connection emitter terminal is common to both input and output signal. This connection is also called as grounded emitter connection.

• ## Operation of BJT in active, saturation and cuttoff region

Collector current : The collector current consists of two components. a) Reverse saturation current through reverse biased base collector junction. The base collector junction can be thought of as reverse biased diode. Then the current through the base collector junction from the diode current equation is given as.

• Feb 10, 2017 · Hello, I'm wondering if it is possible to calculate current the collector current of a phototransistor that is paired with an IR Led? I have an IR Led that is 13.6 cm away from the phototransistor and has a radiant intensity of between 65 mw/sr and 125 mw/sr. The phototransistor that I'm

• The factor α / (1 – α) is called Β Beta which is the common emitter current gain. For example if α = 0.98, then the transistor Beta Β can be calculated to be 49. Replacing it is possible to determine the collector current, I c in the equation below: Ic = Β ⋅ Ib – ( Β + 1) Ico.

• Collector Current (PNP) • The collector current is comprised of • Holes injected from emitter, which do not recombine in the base ←(2) • Reverse saturation current of collector junction ←(3) where I CB0 is the collector current which flows when I E = 0 0 0 0 1 α 1 α α α B CE dc CB B dc dc C C dc C B CB βI I I I I I I I I

• Bipolar Transistors are current regulating devices that control the amount of current flowing through them from the Emitter to the Collector terminals in proportion to the amount of biasing voltage applied to their base terminal, thus acting like a current-controlled switch.

• ## Max. Collector Current Active BJT (Quick/Simple) | All About

Apr 20, 2011 · 1) Its collector resistor is 10k and just before the transistor saturates its collector resistor has a max current of 5V/10k= 0.5mA. 2) When it is saturated the collector voltage will be about +0.6V so the 10k collector resistor will have 5.6V across it. 3) Then the max collector current in this circuit is 5.6V/10k= 0.56mA.

• Therefore, the collector current is related to the emitter current which is in turn a function of the B-E voltage. The voltage between two terminals controls the current through the third terminal. This is the basic principle of the BJT 22.071/6.071 Spring 2006, Chaniotakis and Cory 2

• May 23, 2018 · The emitter current (Ie) is almost same as the collector current (Ic), Ie = Ic. As the current flow is relatively same in both collector and emitter, the Vce is very low. Learn more about BJT and MOSFET here. Applications of IGBT: IGBT is mainly used in Power related applications.

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