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158 Threads found on edaboard.com: Transistor Hfe
Hello all... Why i'm ask this question.So,becose my digital universal mutimeter can only count transistor hfe. Well i use Pintar Virtual Lab for my simulatios and he use ß-beta for amplification factor. I ask you wich formula convert hfe to ß-eta? thanks advance zlatko
but no way of gauging exactly how much IB is needed or knowing the expected vbe Yes, that's true. You would use a circuit, that can tolerate some amount of hfe variation by utilizing feedback. Most practical transistor circuits have it.
Need datasheet for BFP519 transistor :?:
I bought that issue. The article describes as title says transistor identifier. It can determine type of transistor PNP, NPN, NJFET, PJFET, NMOS and PMOS. IT allso indicates transistor pins EBC SGD and measures hfe, RDSON and cutoff voltage at fets. Instrument is build arround PIC16F872 it has 2x16 LCD. As I understand (...)
The long time question of hfe..... well, hfe depends on the aplication u are using the transirtor for. eg: if you are designing to work on saturation you wanna try an hfe of 10 or less to asure the transitor keeps in that region, this hfe u desing when polarized, witch i dont think is your case. The other way to decide on (...)
What is the relation between hfe and beta of bipolar transistor?
Does anyone know the temperature coefficients of the following integrated components? diode (Voltage/Temperature) base diffused resistor (Resistance/Temperature) transistor hfe (gain/Temperature) All are for bipolar IC process. Thanks.
Does anyone know the temperature coefficients of the following integrated components? diode (Voltage/Temperature) base diffused resistor (Resistance/Temperature) transistor hfe (gain/Temperature) All are for bipolar IC process. Thanks.
I am looking any info about this transistor. Thanks, Pool_77
You can connect two transistors in different Darlington pairs. It can be connection of PNP+PNP or NPN+NPN or NPN+PNP or PNP+NPN. Second transistor has usually higher current ratings if needed.
Is a transistor a Current Splitter? Because it splits the Base current into 2 paths the Base/emitter path and the Base/collector path so it Splits up the Base current
1. decide NPN or PNP Daigtal multimeter Red Probe is " +" =P type Black Probe is " -" =N type Analog multimeter Red Probe is " _" =P type Black Probe is " + " =N type You can decide the transistor is PNP or NPN . Added after 15 min
You should search for 2SA1154 in the above link. It is there. I found next data: 2SA1154 transistor GENERAL PURPOSE Material : Silicon Polarity : PNP VCBO(max) Collector-to-base voltage, dc, emitter open : 60V VCEO(max) Collector-to-emitter voltage, dc, with base open : 60V VEBO(max) Emitter-to-base voltage, dc, collector open : 5V I
hi can anyone give a ckt which measures the hfe of a transistor(BJT)?it would be better if the circuit could measure hfe for both pnp & npn transistor... regards
can anybody tell how hfe varies from transistor to transistor on the same substrate . Is it a statistical distribution
Why does a transistor heat when base current is high
please i want to know how to design an amplifier that is independent of beta"hfe" as in datasheet beta has no certain value for a certain IC & VCE but it has a minimum and maximum value also it varies with Ic and
hello,smiles U need attension to hefe (DC gain cuurent) to design your circuit to terminate resistor value. Note Ic max (collector current max) to design a limited current. example .For designing transistor as switch which Ic =100 mA. You calculate Rc to limit Ic curent. after chosing Rc(Resistor on collector) => Ib(current on base)= Ic/(hfe*k) .
Hybrid parameter (or H-parameter) is one of a set of four transistor equivalent-circuit parameters that conveniently specify transistor performance for small voltages and currents in a particular circuit. The expression hfe, known as a hybrid parameter, is the common-emitter DC forward-current gain. It is equal to the collector current (...)
I am just learning about electronics and i understand how transistors work but I am having trouble with the math side of things. I am studying the single transistor inverter (which I have drawn very poorly below). If i have a datasheet for the transistor i wish to use, what information do i need, and how do i use it, to work out what (...)
hi, folks. I would like to know why the resistor for the base of 2n3053 is 330 ohms how do we calculater it ? Here is what I think: in a transistor ic=ie hfe = ic/ib ib= ic/hfe since ie approximately equals to ic let ie be 300ma and hfe be 100 ib = ie( 300ma)/hfe( 100)=3ma let's assume pin (...)
hi every one i had searched a about the idea of biasing the transistor in the common emitter circuit i had read different ways but am little confused about something that i want to ask about 1) I read about the q-point at which he transistor must be set at dc operation before injecting the small ac signal to the base..the articles talking a
Can anyone please say what is meant by transition frequency fT seen on transistor datasheets. For BC547 fT=300MHz and for BF494 fT=120MHz. Why it is low for BF494 compared to BC547 even though BF494 is a medium frequency transistor and BC547 is a low frequecy one?
Well Ib=(V1-Vbe)/R1=(10V-0.65V)/100KΩ≈93.5uA If BJT work in active region Ic is equal Ic=Ib*β=93.5uA*β So if our BJT has β=60 Ic will by Ic=93.5uA*60=5.61mA. But if our bjt has β=100 then Ic=9.35mA and transistor will be working in saturation region. Because [b
Hi, I am now doing my final year project.I am going to do a Bipolar Junction transistor Tester by using PIC. It can test out the type of the transistor either NPN or PNP. Bedise that, it can identify the pin of the BJT transistor(Collector, Emitter, and Base) and the current gain(hfe).Those results is display in LCD. Anyone (...)
Hi I'm a newbie in electronic. And I just read a transistor datasheet. I need help understandng the value. This are some value from the data sheet : --------------------------- IC (cont.) (A) 4.0 --------------------------- hfe Min. 300 Max. 1200 @IC(mA) 1000 @
Audioguru: I was looking on the internet for calculation for a transistor as a switch, and a lot of sites uses hfe and the relationship Ic = hfe * IB to calculate the Base resistor: IB = IC / hfe Then RB = (VB - VBE) / IB Can you show the documentation where it makes reference to 1/10th of Collector current ? I (...)
I grabbed this picture, of some site and thought it would be simple to work out, however I can't make sense. Does the second 1k resistor to 0V decrease the base current ? If it was meerly a pulldown i would have thought a 10K resistor would do the job. I calculated the base current v/1k = 9mA , As the base current is supposed to be 1/10 of
Luigi, you just need to check if the transistor is working, or you need to make some measurement? (Like hfe, Vcesat, etc). Regards.
instead of using 4 transistors + resistors u can use ULN2003 to drive relayz with more eaze
I need Motorola 185 M9627 NPN bipolar power transistor datashhet or at least basic info like hfe, Vceo, Pd, Ic, etc... Tanks, Fernando
Hi all, I would want to amplify a DC current from a generator provided by an op amp... I would want to use a bipolar transistor but I'm not familiar in biasing in "DC current amplification mode". The output current should be equal to 100mA. What kind of topology can I use ? and what kind of biaising should I use ? regards
please help who can help me determine the variables in this electronic assembly? thank you
Yes the voltage swing will be from VCC up to zero down, ideally. There is always some voltage drop in the resistor and the transistor, (about 100mV). About the second question could only be answered if we knew the β (or hfe) of your transistor and supply voltage. When amplifying a signal there will ALWAYS be some distortion because (...)
While the load line is actually fixed by the resistance value, the transistor curve is only valid for the selected DC bias. By applying a varying input voltage or current to the amplifier, it is changed. Often text books take account of this fact by showing an AC signal together with the load line.
Hello- I am using a PIC microcontroller, 18F452, 5V. The maximum current source/sunk from any IO pin is 25mA. The maximum current source/sunk by PORTC & PORTD combined is 200mA. The maximum current source/sunk by PORTA & PORTB & PORTE combined is 200mA. I am using all of PORTC (8 pins) to switch 100mA of light wire per each pin. I am not usi
First Hi to All the People because it is first time I am writing to any Forum. I am doing B.Tech in Electronics I have read hundred of Books on transistor but didnt find much details regarding basic concept. For example transistor 2N3904 has a maximum Ic 200mA and generally in all the books its DC gain is given as 100 but when you read data sheet
Hello, is there any equivalent for RCA 40242 transistor? Any suggestions?
Someone asked question in forum about transistor hfe DC gain and I read a reply which stated that "Make transistor circuit which is independent of hfe". So they advice to use voltage divider bias. If I accept that transistor circuit can be made independent of hfe then all (...)
Quick calculation : 100Watt at 10V input voltage (neglecting efficiency of the system) = ~10Amps in the transistors. The transistor you choose is not good. Maximum,specification only 6 amps. hfe in the order of 30 for high currents, this means you should need 333mA base current at 10Amps, not good for the 555. You need better (...)
Small variations in the base current will have big variation in the collector current. Check transistor explanation in the following link Tutorials, Electronics made EASY, Williamson Labs Alex
Ive got a npn transistor circuit set up in a emitter amplifier configuration.Ive set the base voltage at 5v though the voltage divider and set RE to drop the remaining 4.2v at 50ma which should control IC and IE current. The problem is how do i calculate the value of r1 or r2 of the voltage divider so that it will output 5v even after being conn
the input (vs3) has max amplitude of 10V, and +V Supply (vpos) is +12 and -V Supply (vneg) is -12. the resistant is 10 ohms at minimum So the power is lower than previously stated. Maximum power dissipation of each transistor occurs at Vsupply/2 output voltage, it's 12*12(4*10) = 3.6W, maximum current is 1.2 A. You can use smaller
crazyjohn, Follow the simple BJT eqautions, transistors have same basic eqations relating all its parameers like Ic, Ib, Vce,Vbe,hfe etc. First check it with given values in data sheet. then you calculate required value with available values of other parameters. And well, if you designing something, the dig every thing until you satisfy....Give m
You need a voltage gain of 100 which might not be possible if you bias the base with a negative feedback resistor from its collector. It depends on the signal source resistance. If the source resistance is high then the gain is low. A transistor is never biased with just a single resistor from the supply voltage.
If you mean that shorting the collector and emitter together operates the relay but putting a logic '1' on the MCU input doesn't operate it, the reason can only be that insufficient base current is flowing and the transistor VCE is not saturating. The 2N2222A is a low gain transistor, if your MCU has a 3.3V output, the most base current that can f
I am working on a project that consists of two separate circuits. On one side is a DC fan powered by a 9V battery. On the other side is an igniter that is powered by 1.5v. What I need to happen is for the fan to run only when the igniter is receiving 1.5v. After some research it appears a transistor may be the best way to do this. Howe
Hi, I'm a bit confused from the datasheet of transistor BC548B I want to know beta or hfe of this transistor, but it is confusing from looking at the datasheet below. BC548B Datasheet Can you have 2 values for hfe? Thanks
did you turned the data bits off just before switching the transistors? And also did you include a small delay before switching transistors? Because nothing is ideal... Any way, i dont know if that is your problem or not... Wait for experts reply.
The datasheet for every transistor part number gives a range for hfe. It also shows the hfe changing with collector current and temperature. You should design a circuit with enough negative feedback so that it works when the hfe of the transistor is minimum or maximum and also works with the minimum and (...)