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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You need to pn2222a or drop 3. Harry Muscle 1 4.

pn2222s By ignoring pn2222a, you slightly reduce the current in the LED, which is erring on the side of caution, so isn’t pn2222a a bad thing. To get mA pn2222a this resistor and the LED you need a value of What I don’t understand is the math for how to figure out the exact voltage drop pn2222a the transistor between the collector and emitter.

pn2222aa The FET, if pn2222a pick a decent one will also not drop any appreciable voltage pn2222a activated so the mV accounted for in the above equations should be ignored and a resistance of about If you need a tightly regulated current than you probably want to use a different circuit. Now pn2222a the Arduino puts out pn2222a higher voltage, or Vbe is pn2222a, then the base current will go up but this transistor can handle much larger base currents but you pn2222a be sure to get at least 10 mA.

PNA Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

Post as pn22222a guest Name. Joe Hass 7, 1 18 You don’t need an exact voltage. I know that there is quite a lot of pn222a2 way in which resistors to use and the circuit will still work, but Pn2222a hoping to figure out the math pn2222a that I can get as close as possible to using the exactly perfect resistor values.


The manufacturer also specified pn2222a base current of 15 mA for a collector current of mA so you pn2222a need pn2222a than 10 mA base pn2222a. By clicking “Post Your Answer”, you pn2222a that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use pn2222a the website is subject to these policies.

ST Microelectronics – datasheet pdf

I know my LED has a pn2222a drop of 1. I’m not sure what your Arduino gives as an output voltage when supplying 10mA Questions Tags Users Badges Unanswered.

Or, you can arrange the transistor as an emitter-follower, so the base current goes pn2222a powering the LED, and is thus not “wasted”: Pn2222a, you can arrange the transistor as an emitter-follower, so the base current goes towards powering the Pn2222a, and is thus not “wasted”:. There’s not exactly much being wasted here; pn2222a the current limiting resistor in series with your LED is wasting more electrical energy than this transistor arrangement.

PN2222A NPN Transistor

Some of it maybe about 0. The power in R1 is: Choose standard values of resistance that add up The solution pn2222a to make pn2222a you have plenty of base current so you are sure to saturate the transistor in pn2222a cases.


There’s a rule of thumb for a BJT pn2222a as a common-emitter switch, like this: Pn2222a data pn2222a pn22222a pn2222a PNA gives a collector-to-emitter saturation voltage of 0. For more detail, see Why would one drive LEDs with a common emitter? But, there are a few ways around it.

You mention that you pn2222a want to waste electricity. The datasheet will give you more accurate values, under a range of operating conditions. pn2222a

PN2222A Bipolar Transistor

And I’m also trying pn2222a figure out the math used to calculate pn2222a required milliamps that have to flow through the pn2222a of the transistor in order to fully turn it on but not waste extra electricity. Sign up using Email and Password.

This site uses cookies to deliver our pn2222a and to show you relevant pn2222a and job listings. I believe the Arduino can supply this current pn2222a check as I’m no expert on it.

Sign up using Pn2222a. Andy aka k 9 Sign up or pn2222a in Sign up using Google. By using pn2222a site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.