KN2222A PDF

KNA Transistor Datasheet pdf, KNA Equivalent. Parameters and Characteristics. 22 Sep Hello all. I have a relay driver circuit which I used a KNA NPN transistor to switch 5V relay grounding. According to the datasheet facing to. KNA Description = General Purpose Transistor ;; Package = TO

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The problem is that at the very low current levels you expect with the first stage, current gain goes way down, so the overall gain is kn2222z than you expect from reading the data sheet.

You May Also Like: The first transistor will saturate according to the data sheet at 0. 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. Also note the catch diode. This means that the relay is only getting about 4. Nov 4, 2, If you interchange the collector and emitter of a modern planer BJT transistor, the Beta will be much less and the collector breakdown voltage is now equal to the base-emitter breakdown which is usually only about 5V.

As a result, you have to drive the Darlington harder than you think you need to. The coil voltage is given in the last digit or two of the part number, and may be 3, 5, 6, 9, 12, 18, 24, 36, or 48 volts.

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Sign up or log in Sign nk2222a using Google. Your name or email address: Always use one of these. But these are at voltages of 10V. Which is forward bias and which is reverse bias?

This does not affect your observation but please note that there are two conflicting pin-outs for 2N All this little factoids make me think your expectations of the transistor, when wired as a darlington, are too high.

There are nine different relays described on the datasheet which differ kb2222a in the coil voltage. As the title explains it, I have KnA x2 transistors connected as a Darlington pair connected at the ground side of a [JQC-3F T73 5v] relay The relay is connected to a 5v power supply. KNA works reverse bias Reply to Thread. According to the datasheet facing to the flat side of the transistor the squence from left to right is Collector – Base – Emitter.

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Last edited by a moderator: If the part number on nk2222a relay ends in “-5”, it is designed for use with a 5 volt power supply. Do you already have an account?

Forward and reverse bias – diode Posted by KevinEamon in forum: Sep 22, 3. 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. Nk2222a am a little confused.

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When I check both datasheets their characteristics are not the same but smilar and according to the measurements all the Voltage and Current values are in range. Oct 2, 17, 5, In general the gain will be less if you have it backwards, but for a switching application like yours, you may never notice!

Sep 23, 9. Andy aka k 10 Sep 22, 5. No, create an account now. Discussion in ‘ General Electronics Chat ‘ started by cincirSep 22, This means you are probably only getting 4V across the relay at best.

Sep 22, 2. Sep 22, 7.

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In this configuration, the high gain does not carry over to the situation where you want to turn the transistor hard on. Practical Uses of Instrumentation Amplifiers Basic refresher on instrumentation amplifiers, kn22222a by a several real world applications in which an engineer would find this circuit. It works this way but when I turn it connect the other way Emitter – Base – Collector it still works.