Morn Sep 22, 3 0. The impurity doping concentration profile at the base-emitter junction is different from that of the base-collector junction. Sep 23, 9. Hfe is only really guaranteed to be about 50 on the first transistor and possibly about on the 2nd transistor. The Value of Customization: Transistor datasheet relay datasheet another question is, can the relay function at higher than 5volts? The circuit below is the last attempt to make this work with the two transistors.
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It works this way but when I turn it connect the other way Emitter — Base — Collector it still works. Sign up using Email and Password. This means you are probably only getting 4V across the relay at best. Apr 5, 5. Sign up or log in Sign up using Google. Which is forward bias and which is reverse bias? Hfe is only really guaranteed to be about 50 on the first transistor and possibly about on the 2nd transistor.
Apr 16, 3, 1, The Value of Customization: Also, I saw somewhere a cap in parallel with the diode, is that a good idea? This does not affect your observation but please note that there are two conflicting pin-outs for 2N Seems like it should work fine with a single transistor.
Transistor Catalog I am a little confused. Thank you for all the replies. Read page 2 of the data sheet. Oct 2, 17, 5, I suspect that your KNA is bad or low gain. A darlington transistor configuration cannot turn-on down to anything close to 0V. To control the servo I build a H bridge circuit that is working fine. 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. Email Required, but never shown.
Feb 23, 3 0. Sep 23, 9. Apr 5, 1. Apr 5, 2. Apr 5, 4. Switching a 12vdc motor with a transistor Posted by Rich2 in forum: Sep 22, 7. Dec 29, 1, Hence the collector and emitter are not interchangeable. TOP 10 Related.
KN2222A Bipolar Transistor
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P2N2222A Bipolar Transistor
It is used in a variety of analog amplification and switching applications. PNA and other "Plastic" versions[ edit ] Replacements for the 2N are commonly available now in the cheaper TO packaging, where it is known as the PN or P2N, which has similar specifications except for the lower maximum collector current. Surface-mount versions[ edit ] Single transistors are also available in several different surface mount packages, and a number of manufacturers market surface mount packages that incorporate several 2Ntype transistors in one package as an array of transistors. The general specifications of the various variants are similar, with the biggest difference being the maximum allowable current and power dissipation. Similar types[ edit ] The BC family, including the BCA to BCC, are lower voltage, lower current, general-purpose transistors in TO packages, originating in Europe, that are often found in small-signal amplification and switching circuits of the type where the 2N might otherwise be used.