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 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. Essentially I stopped reading there.

BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

Sign up using Email and Password. ChetanBhargava He’s reading the minimum hFE, it goes up to Datasyeet is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.

A forced beta of 20 is usually good. It seemed superfluous at the time, but it makes a better answer. 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. I assumed that’s what he had in the junkbin. BC as switch with Arduino Ask Question. Essentially you’ll use one of these circuits: As you can see, there is no base resistor. Email Required, but never shown.


(PDF) BC637 Datasheet download

Then you pick a base resistor to make sure the transistor is saturated. The voltage at the emitter will closely track the voltage at the base, only 0. 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.

That’s how I select transistors.

The voltage at the collector does not have any say in the current through the LED, which is another benefit. Thank you for the explanation, well i’m student in the area so i lack the expertise. Look at this spread from the datasheet:. Common emitter switch 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.

Spehro Pefhany k 4 Why not add 3 common emitter switch?

I’d sure like to see the documentation that claims this is the recommended value. This works if the voltage drop across the LED is small enough that dahasheet 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.


I’m glad you’ve done the calculations, that’s a good start. A conservative number is one tenth datasheey the current through the collector.

BC Datasheet(PDF) – Fairchild Semiconductor

The transistor will draw the absolute minimum amount of base current necessary to keep the right amount of current flowing through the collector. 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. Look at this spread from the datasheet: 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. Sign up or log in Sign up using Google. A little warning however: This is no omission from my part, and it is one of the benefits of this configuration: So using the formula: The datasheet for the BC shows it as less than mV up to a collector current of mA.

Will it work the way I planned?

Here is the simplified schematic: The gain of the transistor is not well defined probably between 80 and Sign up using Facebook. Essentially you’ll use one of these circuits:. ChetanBhargava i salvaged this from one circuit and its laying in my bin. The goal is to drive enough current through the base to make this happen.