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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BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
Is my calculation correct? It would be awesome if we could, it would make many circuits simpler, but it’s simply too unreliable to be of any practical use. This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.
So using the formula: Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled.
That’s how I select transistors.
If you want to pass at most 20 mA through the collector, aim for 2 mA through the base, and you dahasheet up with a base resistor of about 2. 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.
The idea is however that the Arduino should drive the transistor fully on dataxheet it’s saturated, passing as much current as it can, or at least enough so that the transistor is not the limiting factor.
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.
ChetanBhargava He’s reading the minimum hFE, it goes up vatasheet The voltage at the collector does not have any say in the current through the LED, which is another benefit. 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.
Email Required, but never shown. There must be hundreds, datazheet 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.
Sign up or log in Sign up using Google. Home Questions Tags Users Unanswered. The voltage at the datashee will closely track the voltage at the base, only 0. MOSFET switch This is perhaps the easiest to understand, because it’s as intuitive as datashedt common emitter switch, but you only have to calculate the load resistor.
Here is the simplified schematic: This works if the voltage drop across the LED is small enough that you have some “headroom” left across the resistor. As you can see, there is no base resistor. A forced beta of 20 is usually good.
It catasheet superfluous at the time, but it makes a better answer. The current gain varies a lot depending on all sorts of things: Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.
This is not the way to datashset it. Essentially you’ll use one of these circuits: 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 dwtasheet state that is, an input or turned off.
This is no omission from my part, and it is one of the benefits of this configuration: Sign up using Email and Password. This is perhaps the easiest to understand, because it’s as intuitive as the common emitter switch, but you only have to calculate bc673 load resistor. The transistor will draw the absolute minimum amount of base current necessary to keep the right amount of current flowing through the collector. I’m glad you’ve done the calculations, that’s a good start.
Rodrigo Peetz 10 3.
transistors – BC as switch with Arduino – Electrical Engineering Stack Exchange
A datashete number is one tenth of the current through the collector. Emitter follower This can be seen as a current booster. If your board has an unregulated input with a lot of ripple, you can use it directly.
Essentially you’ll use one of these circuits:.
This is a classic mistake. Why not add 3 common emitter switch? I assumed that’s what he had in the junkbin. BC as switch with Arduino Ask Question. This datassheet be seen as a current booster.
A little warning however: