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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KNA (KEC) – General Purpose Transistor, Package = TO | eet

Sep 22, 2. I simulated your motor circuit and and looks like it should work. Transistor datasheet relay datasheet another question is, kn222a2 the relay function at higher than 5volts? 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.

I suppose that you have made certain of your wiring? If you don’t, you’ll get a turn-off voltage spike which may well kill your transistor. Thanks for the replay. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie hransistorand that your continued use of the website is subject to these policies. Post as a guest Name.

If you wanted to run it from 12 volts, you would need one with the part number ending in “”. Maybe I just needed a morning out with the bike and your help.


My first hypothesis is that the arduino doesn’t provide enouth current to saturate the power transistor. Sep 22, 1. Maybe this will be lower at 5V, I can’t say for sure. Your name or email address: 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.

KN2222A works reverse bias

Sep 23, 9. Hi I tried what you said and it worked. Sep 22, 3 0. Read page 2 of the data sheet.

The circuit below is the last attempt to make this work with the two transistors. Yes, I certainly did check many times.


Home Questions Tags Users Unanswered. Sep 22, 4. This is actually normal behavior. Create a no-fly zone! No, create an account now. Sign up using Email and Password. Sep 22, 7. Which is forward bias and which is reverse bias? Seems like it should work fine with a single transistor.

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. I am a little confused. Find out in this Teardown Tuesday!

So, I tried to connect this transistor gate to the emitter of another KNA transistor, no luck either. Yes, my password is: You May Also Like: The impurity doping concentration profile at the base-emitter junction is different from that of the base-collector junction. Assuming this is true, I think you’re running up against a characteristic of the Darlington – high saturation voltage.


Do you already have an account? 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 Also note the catch diode.

WhatRoughBeast 49k 2 28 Maybe my cheap multimeter was messing around, maybe the USB wasn’t giving the 0. Hence the collector and emitter are not interchangeable. You can try with any general purpose transistor like 2N or BC Anyway, now, connecting the 5V from the Arduino to the base directly just testing fully saturates the power transistor, but doing so shutdown the board in less than a second.

In general the gain will be less if you have it backwards, but for a switching application like yours, you may never notice! As a result, you have to drive the Darlington harder than you think you need to. Quote of transiztor day. Sep 22, 6. 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. Apr 5, 5.