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’m glad you’ve done the calculations, that’s a good start. Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.
BC – BC NPN High Current Transistor
This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. Bc6337 calculate the resistor value by looking up the voltage drop across the LED datasgeet the current you want, then observing that the voltage drop across the resistor will be the voltage from the Arduino pin minus 0. 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.
Then you pick a base resistor datawheet make sure the transistor is saturated. 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 2.
Is my calculation correct? BC as switch with Arduino Ask Question. A little warning however: Home Questions Tags Users Unanswered. 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. The current gain varies a lot depending on all sorts of things: I’d sure like to see the documentation that claims this is the recommended value.
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. Email Required, but never shown. Sign up or log in Sign up using Google.
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. The goal is to drive enough current through the base to make this happen.
MOSFET switch 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. This is not the way to do it. As you can see, there is no base resistor. A forced beta of 20 is usually good. 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.
BC637 Datasheet, Equivalent, Cross Reference Search
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. Essentially you’ll use one of these circuits:. It is better to add a series resistor on the LED – the forward voltage of a blue LED datazheet probably around 3V, so the resistor drops 2V and at 22mA it would have to be about 91 ohms.
Emitter follower This can be seen as a current booster. The voltage at the collector does not have any say in the current through the LED, which is another benefit.