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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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KN2222A works reverse bias

Also note the catch diode. Hence the collector and emitter are not interchangeable.

Read page 2 of the data sheet. As a result, you have to drive the Darlington harder than you think you need to. There are nine different relays described on the datasheet which differ only in the coil voltage. transstor

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. But these kkn2222a at voltages of 10V.

KNA works reverse bias | All About Circuits

If you don’t, you’ll get a turn-off voltage trnasistor which may well kill your transistor. You May Also Like: A darlington transistor configuration cannot turn-on down to anything close to 0V.


You can try with any general purpose transistor like 2N or BC Last edited by a moderator: Sep 22, 1. Quote of the day.

Feb 23, 3 0. Maybe this will be lower at 5V, I can’t say for sure.

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 “”. Assuming trnasistor is true, I think you’re running up against a characteristic of the Darlington – high saturation voltage. Sep 22, 6. The first transistor will saturate according to the data sheet at 0.

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

I’m having hard time getting Hfe from the datasheet, and knowing the amp needed by the relay. I suspect that your KNA is bad or low gain. The first thing I notice about the transiator is its pinout: Your name or email address: Thank you in advance.

All this little factoids make me think your expectations of the transistor, when wired as a darlington, are too high. Sep 22, 7. Apr 16, 3, 1, This does not affect your observation but please note that there are two conflicting pin-outs for 2N Sep 22, 2. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Thank teansistor for all the replies. Tranxistor am a little confused.

KN2222A Datasheet, Equivalent, Cross Reference Search

Sep 22, 5. Forward and reverse bias – diode Posted by KevinEamon in forum: Digital Tattoos Bend The Limits Digital tattoos are an interesting implementation of an new category of “flexible electronics. But, before that I bought some TIP darlington in a local store to replace the Kn2222a, and it worked perfectly.

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. Maybe my cheap multimeter was messing around, maybe the USB wasn’t giving the 0. Yes, I certainly did check many times.