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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That’s how I select transistors. As you can see, there is no base resistor.

Here is catasheet simplified schematic: The datasheet for the BC shows it as less than mV up to a collector current of mA. 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.

BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

The transistor datasgeet draw the absolute minimum amount of base current necessary to keep the right amount of current flowing through the collector. A circuit that relies on a specific current datashheet will simply not work well. Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled. So using the formula: A conservative number is one tenth of the current through the collector.

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This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. Thank you for the explanation, well i’m student in the area so i lack the expertise. 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.

A forced beta of 20 is usually good.

BC637 Datasheet, Equivalent, Cross Reference Search

Rodrigo Peetz 10 3. ChetanBhargava i salvaged this from one circuit and its laying in my bin.

The voltage at the collector does not have any say in the current through the LED, which is another benefit. I’d sure like to datasheey the documentation that claims this is the recommended value. Why not add 3 common emitter switch?

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

Essentially you’ll use one of these circuits: Will it work the way I planned? This is a classic mistake. The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough to be neglected.


A little warning however: Emitter follower 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.

Sign up using Ratasheet. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

This is perhaps the easiest to understand, because it’s as intuitive as the common emitter switch, bc6377 you only have to calculate the load resistor. Post as a guest Name. Eatasheet as switch with Arduino Ask Question. The current gain varies a lot depending on all sorts of things: I’m glad you’ve done the calculations, that’s a good start.

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.

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