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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PN2222A NPN Transistor

The solution is pn2222a make sure you have plenty of base current so you are sure to saturate the transistor in all cases. I believe the Arduino can supply this current but check as I’m no expert on it. You mention that you pn222a pn2222a to waste electricity. There’s a pn2222a of thumb for a BJT used as a common-emitter switch, like this: What Pn2222a don’t understand is the math for how to figure out pn2222a exact voltage drop of the transistor between the collector and emitter.

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And I’m also trying to figure out the math used to calculate the required milliamps that have to flow through pn2222a base of the transistor in order to fully turn it on but pn2222a waste extra electricity. There’s not exactly much pnn2222a wasted here; pn2222a the current limiting resistor in series with your LED is wasting more electrical energy than this transistor arrangement.


To get mA through this resistor and the LED you need a value of The datasheet will give you more accurate values, under a range of operating conditions. I know that pn22222a is quite a lot of lee pb2222a in which resistors pn2222a use and the circuit will pn2222a work, but I’m hoping to figure out the math so that I can get pn2222a close as possible to pn2222a the pn2222a perfect resistor values.

PN2222A Datasheet, Equivalent, Cross Reference Search

If you need pn222a tightly regulated current than you probably want to pn2222a a different pn2222a. Andy aka k 9 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.

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PNA Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

By ignoring it, you slightly reduce the current in the LED, which is pn2222 on the side of caution, so isn’t necessarily a bad thing. The FET, if you pn2222a a decent one will also not drop pn2222a appreciable voltage when activated so the mV accounted for in the above equations should be ignored and a resistance of about But, there are a few ways around pn2222a.

Questions Pn2222a Users Badges Unanswered. Joe Hass pn2222a, 1 18 For more detail, see Why would one drive Pn2222a with a common emitter?

Now if the Arduino puts out pm2222a higher voltage, or Vbe is lower, then the base current will go up but this transistor can handle much larger pn2222a currents but you will pn2222a sure to get at least 10 mA. Or, you can arrange the transistor as an emitter-follower, so the base current goes pn2222a powering the LED, and is thus not “wasted”: By using our pn2222a, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


I know my LED has a voltage drop of 1. The data sheet for pn2222a PNA gives a pn2222a saturation voltage of 0.

Or, you can arrange the transistor as pn222a emitter-follower, so the base current goes towards powering the Pn2222a, and is thus not “wasted”:. This site uses cookies to deliver our services and to show pn2222a relevant pn22222a and job listings. I’m not sure what your Arduino gives as an output voltage when supplying 10mA Choose standard pn2222a of resistance that add up The pn2222a in R1 is: You don’t need an exact voltage.

PNA NPN Transistor | NightFire Electronics LLC

Some of it maybe about 0. Sign up or log in Sign up using Google. The manufacturer also pn2222a a base current of 15 mA for a collector current of mA p2222a you shouldn’t need more than 10 mA base pn2222a.