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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I assumed that’s what he had in the junkbin.

You calculate the resistor value by looking up the voltage drop across the LED for datashee current you want, then observing that the voltage drop across the resistor will be the voltage from the Arduino pin minus 0. Then you pick a base resistor to make sure the transistor is saturated. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. This is a classic mistake. Sign up using Email and Password. That’s how I select transistors.

Spehro Pefhany k 4 It would be awesome if we could, it would make many circuits simpler, but it’s simply too unreliable to datasyeet of any practical use.

BC637 Datasheet

ChetanBhargava He’s reading the minimum hFE, it goes up to Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. Essentially you’ll use one of these circuits:.


The voltage at the emitter will closely track the voltage at the base, only 0. Home Questions Tags Users Unanswered. Is my calculation correct? This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you satasheet right now.

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 hc637 use of the website is subject to these policies. The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough to be neglected. This datashwet no omission from my part, and it is one of the benefits of this configuration: The current gain varies a lot depending on all sorts of things: Why not add 3 common emitter switch?

I’d sure like to see the documentation that claims this is the recommended value. Sign up using Facebook. If your board has an unregulated input with a lot datashet ripple, you can use it directly. 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

Will it work the way I planned? This can be seen as a current booster. Post as a guest Name. RodrigoPeetz Yes, no one will blame you or think less of you for assuming bc673 you can use the transistor in the way you wanted.

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(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. Here is the simplified schematic: 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 datasheft. This works if the voltage drop across the LED is small enough that you have some “headroom” left across the resistor.

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. Look at this spread from the datasheet:.

This is not the way to do it. Essentially you’ll use one of these circuits: A forced beta of 20 is usually good.