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 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.

BC637 Datasheet, Equivalent, Cross Reference Search

This is not the way to do it. Is my calculation correct? Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled. The voltage at the emitter datashedt closely track the voltage at the base, only 0.

Essentially you’ll use one of these circuits: I’d sure like to see the documentation that claims this is the recommended value. Post as a guest Name.

It seemed superfluous at the time, but it makes a better answer. Sign up or log in Sign up using Google. Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.

If the 5V rail drops before the power to the Arduino, perhaps if they are powered from separate rails, all the current to the LED will come from the base, and thus from the Arduino.

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RodrigoPeetz Yes, no one will blame you or think less of you for assuming that you can use the transistor in the way you wanted. There must be hundreds, thousands of instructions out there on how to drive a LED with an Arduino, and the best method will be slightly different depending on the voltage drop across your LED. A forced beta of 20 is usually good. Look at this spread from the datasheet:. Since the output from the Arduino will be close to 5 volt, and V BE can be treated roughly as a diode, you will have about 4.

Email Required, datashee never shown. Sign up using Email and Password. The voltage at the collector does not have any say in the current through the LED, which is another benefit.

BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

I assumed that’s what he had in the junkbin. The gain of the transistor is not well defined probably between 80 bc6337 Essentially I stopped reading there. This is no omission from my part, and it is one of datashedt benefits of this configuration: Why not add 3 common emitter switch?

Sign up using Facebook. This can be seen as a current booster. I don’t 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. Emitter follower This can be seen bc6337 a current booster.

This is a classic mistake. This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. The idea is however that the Arduino should drive the transistor fully bc63 so it’s saturated, passing as much current as it can, or at least enough so that the transistor is not the limiting factor. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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A conservative number is one tenth of the current through the collector. Look at this spread from the datasheet: Home Questions Tags Users Unanswered.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. That’s how I select transistors.

Essentially you’ll use one of these circuits:. Rodrigo Peetz 10 3.

BC637 – BC637 NPN High Current Transistor

Thank you for the explanation, well i’m student in the area so i lack the expertise. Then you pick a base resistor to make sure the transistor is saturated. Datasehet works if the voltage drop across the LED is small enough that you have some “headroom” left across the resistor.

This is perhaps the easiest to understand, because it’s vatasheet intuitive as the common emitter switch, but you only have to calculate the load resistor. I’m glad you’ve done the calculations, that’s a good start.

Here is the simplified schematic: The current gain varies a lot depending on all sorts of things: