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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The goal is to drive enough current through the base to make this happen. Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled.
transistors – BC as switch with Arduino – Electrical Engineering Stack Exchange
ChetanBhargava i salvaged this from one circuit and its laying in my bin. The voltage at the emitter will closely track the voltage at the base, only 0.
Emitter follower This can be seen as a current booster. 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 bcc637 to be about 91 ohms.
I’d sure like to see dagasheet documentation that claims this is the recommended value. 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. You calculate the resistor value by looking up the voltage drop across the LED for the current b6c37 want, then observing that the voltage drop across the resistor will be the voltage from the Arduino pin minus 0.
(PDF) BC637 Datasheet download
Look at this spread from the datasheet:. I assumed that’s what he had in the junkbin. This datashewt perhaps the easiest to understand, because it’s as intuitive as the common emitter switch, but you only have to calculate the load resistor.
BC as switch with Arduino Ask Question. Essentially you’ll use one of these circuits: 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.
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.
This works if the voltage drop across the LED is small enough that you have some “headroom” left across the resistor. Rodrigo Peetz 10 3.
This is no omission from my part, daatasheet it is one of the benefits of this configuration: Will it work the way I planned? A little warning however: 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.
So using the formula: Home Questions Tags Users Unanswered. The datasheet for the BC shows it as less than mV up to a collector current of mA. Here is the simplified schematic: Sign up or log in Sign up using Google.
BC637 – BC637 NPN High Current Transistor
The current gain varies a lot depending on all bv637 of things: A circuit that relies on a specific current gain will simply not work well. Is datasueet calculation correct? Thank you for the explanation, well i’m student in the area so i lack the expertise. It seemed superfluous at the time, but it makes a better answer. A forced beta of 20 is usually good. The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough to be neglected.
Essentially I stopped reading there. If your board has an unregulated input with a lot of ripple, you can use it directly. This is a classic mistake. A conservative number is datashete tenth of the current through the collector.
Essentially you’ll use one of these circuits:.
This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. Why not add 3 common emitter switch? Post as a guest Name.
BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
I’m glad you’ve done the calculations, that’s a good start. As you can see, there is no base resistor. Then you pick a base resistor to make sure the transistor is saturated. If you want to pass at most 20 mA through the collector, aim datawheet 2 mA through the base, and you end up with a base resistor of about 2.