BC, BC, BC High Current Transistors NPN Silicon Features. Base NPN Epitaxial Silicon Transistor Absolute Maximum Ratings Ta=25 C unless otherwise noted Symbol Parameter Value Units VCER Collector-Emitter Voltage at RBE=1K? : BC 45 V: BC 60 V: BC V. BC BC VCEO. Vdc. Collector – Base Voltage. BC BC BC VCBO dimensions section on page 4 of this data sheet. ORDERING. DATA SHEET. Product specification. Supersedes data of Apr Oct DISCRETE SEMICONDUCTORS. BC; BC; BC
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The goal is to drive enough current through the base to make this happen. The current gain varies a lot depending on all sorts of things: Home Questions Tags Users Unanswered. I’m glad you’ve done the calculations, that’s a good start. The voltage at the collector does not have any say in the current through the Bv637, which is another benefit.
If your board has an unregulated input with a lot of ripple, you can use it directly. Essentially I stopped reading there. Sign up using Facebook. It would be awesome if we could, it would make datasheett circuits simpler, but it’s simply too unreliable to datassheet of any practical use. Is my calculation correct? I dataxheet have much experience with electronic components, and I would like to ask someone with more experience than me to check if my calculation is correct.
Essentially you’ll use one of these circuits:. Email Required, but never shown. This is perhaps the easiest to understand, because it’s as intuitive as the common emitter switch, but you only have to calculate the load resistor.
So using the formula: A circuit that relies on a specific current gain will simply not work well. Then you pick a base resistor to make sure the transistor is saturated. This can be seen as a current booster.
I’d sure datasheett to see the documentation that claims this is the recommended value. A forced beta of 20 is usually good. The gain of the transistor is not well defined probably between 80 and You calculate the resistor value by looking up the voltage drop across the LED for the current you want, then observing that the voltage drop across the resistor will be the voltage from the Arduino pin minus 0.
If you want to pass at most 20 mA through the collector, aim for 2 mA through the base, and you end up with a base resistor of about 2. Sign up or log in Sign up using Google. Since datasheer output from the Arduino will be close to 5 volt, and V Bc67 can be treated roughly as a diode, you will have about 4.
It seemed superfluous at the time, but it makes a better answer.
(PDF) BC637 Datasheet download
The series resistor at the gate is there to limit the switching current, and the resistor from gate to ground is there to make sure that the gate is not floating while the pin is in a high-impedance state that is, an input or turned off. A little warning however: That’s how I select transistors.
This is not the way to do datasheeh. MOSFET switch This is perhaps the easiest to understand, because it’s as intuitive as the common emitter switch, but you only have to calculate the load resistor.
A conservative number is one tenth of the current through the collector. Look at this spread b637 the datasheet: The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough to be neglected.
BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
I assumed that’s what he had in the junkbin. Look at this spread from the datasheet:. Will it work the way I planned?
It is better to add a series resistor on the LED – the forward voltage of a blue LED is probably around 3V, so the resistor drops 2V and at 22mA it would have to be about 91 ohms.
The idea is however that the Arduino should drive the transistor fully on so it’s saturated, passing as much current as it can, or at least enough so that the transistor is not the limiting factor. Sign up using Ratasheet and Password. This is a classic gc637. This is no omission from my part, and it is one of the benefits of this configuration: Post as a guest Name.