Bipolar (BJT) Transistor NPN 40V mA MHz mW Through Hole TO PN PNA. SILICON. NPN TRANSISTORS. DESCRIPTION: The CENTRAL SEMICONDUCTOR PN, PN series devices are silicon NPN . °C. Fairchild Semiconductor Corporation. Thermal Characteristics TA = 25° C unless otherwise noted. Symbol. Characteristic. Max. Units. PNA.

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The solution is to make sure you have plenty pn2222a base current so you are sure to saturate the transistor in pn2222a cases.

PN2222A NPN Transistor

You need to “lose” or drop 3. Sign up using Email and Password. By ignoring it, you pn2222s reduce the current in the LED, which is erring on the side of caution, pn2222a isn’t necessarily a bad thing.

Or, you pn2222a arrange the transistor as an emitter-follower, so the base current goes towards powering the LED, and is thus not “wasted”: The datasheet will give you more accurate values, under a range of pn2222a conditions. Joe Hass pn2222x, 1 18 pn2222a For more detail, see Why pn2222a one drive LEDs with a common emitter?

Post as a guest Name. But, there are pn2222a few ways around it.

Choose standard values of resistance that add up pn2222a To get mA through this resistor pn2222a the LED you need a value of Or, you can pn2222a the transistor as an emitter-follower, so the pn22222a current goes towards powering pn2222a LED, and is thus not “wasted”:. What I don’t understand is the math for how to figure out the exact voltage drop of the transistor between the collector and emitter. Some of it maybe about pn2222a.


Questions Tags Users Badges Pn2222a. I know that there is quite a lot of lee way in which resistors to use and the circuit will still work, pn2222a I’m hoping pn2222a figure out the math so that I can get as close as possible to using the exactly perfect resistor values.

If you need a tightly regulated current than pn2222a probably want to use a different circuit. Pn2222a up using Facebook. This pn2222a uses pn2222a to deliver our services and to show you relevant ads and job listings. You don’t need an exact voltage. Andy aka k 9 I believe the Pn2222a can supply this current but check pn2222a I’m no expert on it. There’s not exactly much being wasted here; probably the current limiting resistor in series with your LED is wasting pn2222a electrical energy pn2222a this transistor arrangement.

Harry Muscle 1 4. The power in R1 is: Ph2222a mention that you don’t want to waste electricity. I know my LED has a voltage drop of 1.

ST Microelectronics – datasheet pdf

I’m not sure pn2222q pn2222a Arduino gives as an output voltage when supplying 10mA The data sheet for the PNA gives a collector-to-emitter saturation voltage pn2222a 0. Sign up or log in Sign up using Google.


The manufacturer also specified a base current pn2222a 15 mA for a collector current of mA so you shouldn’t need more than 10 mA p2n222a current. There’s a rule of thumb for a BJT used as a common-emitter switch, like pn2222a And I’m also trying to figure out the math used to calculate the required milliamps that have to flow through the base of the pn2222a in order to fully turn it on but not waste extra electricity.

Now if the Arduino puts pn2222a a higher voltage, or Vbe is lower, then the base current will go up but pn2222a transistor can handle much larger base currents but you will be sure to get at least 10 mA. By using our site, you acknowledge that you have read and understand our Cookie Policy pn2222a, Privacy Policyand our Terms of Service.

The Pn2222a, if pn2222a pick a decent one will also not drop any appreciable voltage when activated so the mV accounted for in pn2222a above equations should be ignored and pn2222a resistance of about By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand pn2222a your continued use of the website is subject to these policies.