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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Will it work the way I planned?
BC – BC NPN High Current Transistor
A forced beta of 20 is usually good. 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. 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.
Look at this spread from the datasheet: This is perhaps the easiest to understand, because it’s as intuitive as the common emitter switch, but you only have to xatasheet the load resistor.
I eatasheet have satasheet experience with electronic components, and I would like to ask someone with more experience than me to check if my calculation is correct. Home Questions Tags Users Unanswered. The transistor will draw the absolute minimum amount of base current necessary to keep datasgeet right amount of current flowing through the collector.
A circuit that relies on a specific current gain will simply not work well. If your board has an unregulated input with a lot of ripple, you can use it directly. 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 datasheet for the BC shows it as less than mV up to a collector current of mA.
BC637 Datasheet, Equivalent, Cross Reference Search
BC as switch with Arduino Ask Question. This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.
BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
I assumed that’s what he had in the junkbin. That’s how I select transistors.
Sign up using Facebook. Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled. It seemed superfluous at the time, but it makes a better answer. Essentially you’ll use datazheet of these circuits:. This can be seen as a current booster. The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough to be neglected.
Why not add 3 common emitter switch?
I’m glad you’ve done the calculations, that’s a good start. Post as a guest Name. A little warning however: As you can see, there is no base resistor.
You calculate the resistor value by looking up the voltage drop across the LED for the current bc6637 want, then observing that the voltage drop across the resistor will be the voltage from the Arduino pin minus 0. Look at this spread from the datasheet:.
The gain of the transistor is not well defined probably between 80 and Then you pick a base resistor to make sure the transistor is saturated. Essentially I stopped reading there. Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.