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

This can be seen as a current booster.

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. It is better to add a series resistor on the LED – the forward voltage of a blue LED is probably around 3V, cb637 the resistor drops 2V and at adtasheet it would have to be about 91 ohms.

Emitter follower This can be seen as a current booster.

I’m glad you’ve done the calculations, that’s a good start. 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.

By using our site, you acknowledge that you have read and understand our Dafasheet PolicyPrivacy Policyand our Terms of Service. As you can see, there is no base resistor. This is the traditional “Transistor-as-a-switch” configuration, and is similar to what you have right now.

Sign up using Email and Password. 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.

Spehro Pefhany k 4 The current gain varies a lot depending on all sorts of things: 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.

(PDF) BC637 Datasheet download

The datasheet for the BC shows it as less than mV up to a collector current of mA. ChetanBhargava i salvaged this from one circuit and its laying in my bin. If your board has an unregulated input with a lot of ripple, you can use it directly. 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.

BC Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

Sign up using Facebook. The transistor will draw the absolute minimum amount of base current necessary to keep the right amount datqsheet current flowing through the collector.

This is a classic mistake. Sign up or log in Sign up using Google.

Look at this spread from the datasheet: The gain of the transistor is not well defined probably between 80 and A forced beta of 20 is usually good. 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.

I assumed that’s what he had in the junkbin. Post as a guest Name. Here is the simplified schematic: 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. Will it work the way Datahseet planned?

It seemed superfluous at the time, but it makes a better answer. Email Required, but never shown. Then you pick a base resistor to make sure the transistor is saturated. If you catasheet 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.

Essentially you’ll use one of these circuits:. 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.