TECHNICAL DATA. KN/A. EPITAXIAL PLANAR NPN TRANSISTOR. Revision No: 0. GENERAL PURPOSE APPLICATION. SWITCHING APPLICATION. KNA Description = General Purpose Transistor ;; Package = TO Part Category: Transistors Manufacturer: KEC Corporation Description: Small Signal Bipolar Transistor, A I(C), 40V V(BR)CEO, 1-Element, NPN, Silicon, TO -.

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Apr 16, 3, 1, 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.

Korea Electronics (KEC) – datasheet pdf

Dec 29, 1, Oct 2, 17, 5, If you interchange the on2222a 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.

I’m having hard time getting Hfe from the datasheet, and knowing the amp needed by the relay. Discussion in ‘ The Projects Forum ‘ started by terrikApr 5, Do you already have an account? Always use one of these.

KN2222A Datasheet PDF

This means you are probably only getting 4V across the relay at best. The circuit below is the last attempt to make this work with the two transistors. Switching a 12vdc motor with a transistor Posted by Rich2 in forum: Capacitor, Reverse bias diode and resistor circuit Posted by 13th Warrior in forum: Problem with transistor transistog a motor Reply to Thread. Sep 22, 6.

Forward and reverse bias – diode Posted by KevinEamon in forum: The impurity doping concentration profile at the base-emitter junction is different from that of the base-collector junction. Connecting the gate at 12V immediately runs the motor, so transistor piout discarded.


Andy aka k 10 It works this way but when I turn kn22222a connect the other way Emitter – Base – Collector it still works. Assuming transietor is true, I think you’re running up against a characteristic of the Darlington – high saturation voltage. Mar 14, 20, 5, Digital Tattoos Bend The Limits Digital tattoos are an interesting implementation of an new category of “flexible electronics. I checked so many times the wiring 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.

If the part number on your relay ends in “-5”, it is designed for use transitsor a 5 volt power supply. The first thing I notice about the 2SC is its pinout: Seems like it should work fine with a single transistor.

KN2222A works reverse bias

Maybe my cheap multimeter was messing around, maybe the USB wasn’t giving the 0. Transistor datasheet relay datasheet another question is, can the relay function at higher than 5volts? No, create an account now. If you wanted to run it from 12 volts, you would need one with the part trasistor ending in “”.

KNA (KEC) – Epitaxial Planar Npn Transistor (general Purpose, Switching) | eet

But, before that I bought some TIP darlington in a local store to replace the C, and it worked perfectly. Quote of the day. Dont forget to put a diode across the motor transustor protect your 2sc Sep 22, 5. In k2222a event, compound transistor connections aren’t magic. 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.


No, create an account now. Hi I tried what you said and it worked. Feb 12, The Value of Customization: Create a no-fly zone! The coil voltage is given in the last digit or two of the part number, and may be 3, 5, 6, 9, transistir, 18, 24, 36, or 48 volts.

Thank you for all the replies. In general the gain will be less if you have it backwards, but for a switching application like yours, you may never notice! I was just speculating the base current might be pulling down your voltage source you could measure the base voltage to check for that.

And then the C was working also fine. Yes, I certainly did check many times. Maybe this will be lower at 5V, I can’t say for sure.

Sep 22, 4.

You can try with tgansistor general purpose transistor like 2N or BC My problem is related with my inability to fully saturate the power transistor i recycled from the old board, it’s a NPN transistor 2SC Sep 22, 7.

Also, I saw somewhere a cap in parallel with the diode, is that a good idea? Last edited by a moderator: