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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Korea Electronics (KEC) – datasheet pdf

Kn2222a 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. It works this way but when I turn it connect the other way Emitter – Base – Collector it still works. Sign up or log in Sign up using Google.

But these are at voltages of 10V. Sep 22, 3 0.

KN2222A Datasheet, Equivalent, Cross Reference Search

Post as a guest Name. I am a little confused. 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 less than you expect from reading the data sheet.

This article looks at some kn2222aa the robotic and virtual companions available on the market. Sep 22, 8.

Is it just another expensive gadget, or is there possibly a deeper value to an electronic companion? 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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KN2222A Bipolar Transistor

Sep 22, 6. Assuming this is true, I think you’re running up against a characteristic of the Darlington – high saturation voltage.

Your name or email address: Last edited by a moderator: Home Questions Tags Users Unanswered. Nov 4, 2, As a result, you have to drive the Darlington harder than you think you need to.

This does not affect your observation but please note that there are two conflicting pin-outs for 2N Always use one of these.

KNA works reverse bias | All About Circuits

Forward and reverse bias – diode Posted by KevinEamon in forum: Posted by mujizat in forum: Discussion in ‘ General Electronics Chat ‘ started by cincirSep 22, This means that the relay is only getting about 4.

A darlington transistor configuration cannot turn-on down to anything close to 0V. Read page 2 of kn2222a data sheet. I’m having hard time getting Hfe from the datasheet, and knowing the amp needed by the relay.

Sep 22, 7. The first transistor will saturate according to the data sheet at 0.

Also note the catch diode. Andy aka k 10 This is actually normal behavior.

Sign up using Email and Password. If you wanted to run it from 12 volts, you would need one with the part number ending in “”. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sep 22, 2. If the part number on your relay ends in “-5”, it is designed for use with a 5 volt power supply. Yes, my password is: Oct 2, 17, 5, Practical Uses of Instrumentation Amplifiers Basic refresher on instrumentation amplifiers, followed by a several real world applications in which an engineer would find this circuit.


Quote of the day. 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.

Sep 22, 5. If you don’t, you’ll get a turn-off voltage spike which may well kill your transistor. Could anyone explain what I am doing wrong? There are nine different relays described on the datasheet which differ only in the coil voltage.

Do you already have an account? Capacitor, Reverse bias diode and resistor circuit Posted by 13th Warrior in forum: In this configuration, the high gain does not carry over to kn22222a situation where you want to turn the transistor hard on.