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.

Sign up or log in Sign up using Google. 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. If your board has an unregulated input with a lot of ripple, you can use it directly. 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.

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. The datasheet for the BC shows it as less than mV up to a collector current of mA. Look at this spread from the datasheet:.

I’d sure like to see the documentation that claims this is the recommended value. A conservative number is one tenth of the current through the collector.


A little warning however: BC as switch with Arduino Ask Question. Emitter follower This can be seen as a current booster. Essentially Dataeheet stopped reading there.

This is no omission from my part, and it is one of the benefits of this configuration: I assumed that’s what he had in the junkbin. The voltage V CEbetween the collector and emitter, is called the saturation voltage and is usually small enough datashedt be neglected. Look at this spread from the datasheet: This works if the voltage drop gc637 the LED is small enough that you have some “headroom” left across the resistor.

BC Datasheet(PDF) – Fairchild Semiconductor

A circuit that relies on a specific current gain will simply not work datasheeet. Why not add 3 common emitter switch? The current gain varies a lot depending on all sorts of things: This is a classic mistake. 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.

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. 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.

Rodrigo Peetz 10 3. Spehro Pefhany k 4 Just to be clear, your suggested circuit will put way too much current datashset the LED, and it will be poorly controlled.

BC – BC NPN High Current Transistor

The gain of the transistor is not well defined probably between 80 and Here datashdet the simplified schematic: This is not the way to do it. Essentially you’ll use one of these circuits: Email Required, but never shown. It seemed superfluous at the time, but it makes a better answer. A forced beta of 20 is usually good. 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 i salvaged this from one circuit and its laying in my bin.

Is my calculation correct? Essentially you’ll use one of these circuits:.

BC637 Datasheet, Equivalent, Cross Reference Search

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 datasheeh sure that the gate is not floating while the pin is in a high-impedance state that is, an input or turned off.

So using the formula: The voltage at the collector does not have any say in the current through the LED, which is another benefit. The transistor will draw the absolute minimum amount of base current necessary to bc673 the right datasheeh of current flowing through the collector. Home Questions Tags Users Unanswered.

This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.