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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(PDF) BC637 Datasheet download

Sign up using Email and Password. Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled. MOSFET switch This is perhaps the easiest to understand, because bf637 as intuitive as the common emitter switch, but you only have to calculate the load resistor.

The datasheet for the BC shows it as less than mV up to a collector current of mA. I assumed that’s what he had in the junkbin.

That’s how I select transistors. Thank you for the explanation, well i’m student in the area so i lack the expertise.

This is a classic mistake. This is no omission from my part, and it is one of the benefits of this configuration: Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. This is not the way to do it. The voltage at the collector does not have any say in the current through the LED, which is another benefit.

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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. ChetanBhargava i salvaged this from one circuit and its laying in my bin. I’d sure like to see the documentation that claims this is the recommended value. This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.

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. This can be seen as a current booster. Sign up using Facebook.

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Essentially I stopped reading there. The transistor will draw the absolute minimum amount of base current necessary to keep the right amount of current flowing through the collector.

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.

It seemed superfluous at the time, but it makes a better answer.

transistors – BC as switch with Arduino – Electrical Engineering Stack Exchange

A conservative number is one tenth of the current through the collector. A circuit that relies on a specific current gain will simply not work well. It would be awesome if we could, it would make many circuits simpler, but it’s simply too unreliable to be of any practical datwsheet.

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The voltage V CEbetween the collector and adtasheet, is called the saturation voltage and is usually small enough to be neglected.

Post as a guest Name. Then you pick a base resistor to make sure the transistor is saturated. The current gain varies a lot depending on all sorts of things: 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.

BC637 – BC637 NPN High Current Transistor

Is my calculation correct? Spehro Pefhany k 4 A forced beta of 20 is usually good. Look at this spread from the datasheet:. As you can see, there is no base resistor. ChetanBhargava He’s reading the minimum hFE, it goes up to Rodrigo Peetz 10 3. The gain of the transistor is not well defined probably between 80 and Essentially you’ll use one of these circuits:. A little warning however: I’m glad you’ve done the calculations, that’s a good start. Bc6377 goal is to drive enough current through the base to make this happen.

BC as switch with Arduino Ask Question. Emitter follower This can be seen as a current booster.