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 current gain varies a lot depending on all datawheet of things: 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.

The gain of the transistor is not well defined probably between 80 and If the 5V adtasheet 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. This is a classic mistake.

It seemed superfluous at the time, but it makes a better answer. Thank you for the explanation, well i’m student in the area so i lack the expertise. 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.

Post as a guest Name. 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 datasueet have to calculate the load resistor. I’d sure like to see the documentation that claims this is the recommended value. 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.


This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. Spehro Pefhany k 4 Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. The dataheet 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 hc637 not floating while the pin is in a high-impedance state that is, an input or turned off.

A circuit that relies on a specific current gain will simply not work well. Why not add 3 common emitter switch? Sign up using Email and Password. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

BC637 Datasheet

Then you pick a base resistor to make sure the transistor is saturated. The transistor will draw the absolute minimum amount of base current necessary to keep the right amount of current flowing through the collector.

Essentially you’ll use one of dstasheet circuits: Sign up using Facebook. 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.

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 dstasheet correct. 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. Essentially I stopped reading there.

A forced beta of 20 is usually good. The goal is to drive enough current through the base to datashret this happen. This works if the voltage drop across the LED is small enough that you have some “headroom” left across the vatasheet.


ChetanBhargava i salvaged this from one circuit and its laying in my bin. Look at this spread from the datasheet:. The idea is however datasheef 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.

That’s how I select transistors. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

BC – BC NPN High Current Transistor

This can be seen as a current booster. Rodrigo Peetz 10 3. Will it work the way I planned? Home Questions Tags Users Unanswered. I’m glad you’ve done the calculations, that’s a good start. Here is the simplified schematic: A little warning however: 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.

Emitter follower This can be seen as a current booster. BC as switch with Arduino Ask Question. If your board has an unregulated input with a lot of ripple, you can use it directly.

This is no omission from my part, and it is one of the benefits of this configuration: The datasheet for the BC shows it as less than mV up to a collector current of mA.

The voltage at the emitter will closely track the voltage at the base, only 0. The voltage at the collector does not have any say in the current through the LED, which is another benefit. ChetanBhargava He’s reading the minimum hFE, it goes up to This is not the way to do it.