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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That’s how I select transistors. 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 datashret to be about 91 ohms. 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 works if the voltage drop across the LED is small enough that you have some “headroom” left across the resistor.

BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

I assumed that’s what he had in the junkbin. 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 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.


If your board has an unregulated input with a lot of ripple, you can use it directly. Common emitter switch This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. It seemed superfluous at the time, but it makes a better answer.

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. Look at this spread from the datasheet:. Why not add 3 common emitter switch? Email Required, but never shown. A little warning however: Essentially you’ll use one of these circuits:. This is no omission from my part, and it is one of the benefits of this configuration: Emitter follower This can be seen as a current booster.

Just to be clear, your suggested circuit will put way too much current through the LED, and it will be poorly controlled.

Is my calculation correct? I’d sure like to see the documentation that claims this is the recommended value. Essentially you’ll use one of these circuits: The transistor will draw the absolute datzsheet amount of base current necessary to keep the right amount of current flowing through the collector.

This is the traditional “Transistor-as-a-switch” configuration, and datazheet similar to what you have right now. Look at this spread from the datasheet: 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.

The goal is to drive enough current through the base to make this happen. There must be hundreds, thousands of instructions out there daatsheet how to drive a LED with an Arduino, and the best method will be slightly different depending on the voltage drop across your LED. 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.


This can be seen as a current booster. ChetanBhargava He’s reading the minimum hFE, it goes up to A circuit that relies on a specific current gain bbc637 simply not work well. The idea is however that the Arduino should drive datssheet 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.

The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough to be neglected.

Home Questions Tags Users Unanswered. The voltage at the emitter will closely track the voltage at the base, only 0. The dagasheet for the BC shows it as less than mV up to a collector current of mA. 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.

BC637 – BC637 NPN High Current Transistor

Sign up using Facebook. I’m glad you’ve done the calculations, that’s a good start. ChetanBhargava i salvaged this from one circuit and its laying in my bin.