I think my 3904 transistor might not be working as it should. But we want the transistor in saturation where v cesat is only 0. You could raise that capacity by making it an 820 ohm resistor. The base current must simply be 110th the collector current for the 2n3904 transistor and for most other transistors. This transistor is also available in a throughthehole to92 bulk, and ammopack versions. Less power would be dissipated and leave more voltage for the load. You can see that with an 860ohm transistor on the base, 253ma is being delivered.
Hello, i am trying to teach myself some beginner elecronics by going through the book electronic experiments for the evil genius. In a commonbase configuration of a npn transistor, the collector current i c is the input and emitter current i e is the output, hence the ratio i c i e is the dc. This transistor features fast switching, short turn off and low saturation voltage hence is suitable for switching and amplification. I use these for my joule thief project that i found on youtube while searching how to save energy. Transistor 2n3904 bipolar bjt npn general purpose pack of. The 2n3904 from multicomp pro is a through hole, npn silicon planar switching transistors in to92 metal can package. The transistor npn important 2n3904 specifications from. Datasheet contains the design specifications for product development. However, if it is not given, it can be calculated if the currents, ib the base current and either ie the emitter current or ic the collector current are known. Npn transistor 2n3904 beta value bjt 2n3904 2n3904 npn bjt transistor 2n3904 npn fairchild beta mmbt3904fsct 2n3904 transistor equivalent bjt 2n3904 temp sensor 2n3904 equivalent transistor of 2n3904 equivalent transistor 2n3904. Symbol parameter conditions value unit rthja thermal resistance from junction to ambient note 1 250 kw symbol parameter conditions min. The voltage between the base and emitter v be, is positive at the base and negative at the emitter because for an npn transistor, the base terminal is always positive with respect to the emitter. One of our members talks about using beta in the calculation for the value of the base resistor for the switching transistor. It is typically used for lowcurrent, medium voltage, and moderate speed purposes.
Hi, if you double click on the transistor and select the edit model button, the beta parameter is bf. Npn switching transistor 2n3904 thermal characteristics note 1. Semiconductor components industries, llc, 2003 december, 2003. Some manufacturers mark ebc on the molded part, but all are required to have those connections for a part which is a 2n3904. It is a gain parameter associated with the transistor operating in the analog or linear range. Feb 15, 2011 your transistor information sheet ought to offer the two nominal values for beta and re as nicely a assured values. The transistor npn important 2n3904 specifications from the. The datasheet is printed for reference information only. It is a 200 ma, 40 v, 625 mw transistor with a transition frequency of 300 mhz, with a minimal beta, or current gain, of 100 at a collector current of 10 ma. Characteristics datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. Transistor 2n3904 bipolar bjt npn general purpose pack. Mmbt3904 npn switching transistor dbook, halfpage m3d088. Everything was going great till i came to the transistor part. The 2n3904 is a common npn bipolar junction transistor used for general purpose lowpower.
I think its transistor theory so a bunch of the folks were talking about engineering and electronics and the like in our irc room and i got to talking about how engineers love smashing a whole bunch of letters and numbers together to make chip names sound ridiculous. Pricing and availability on millions of electronic components from digikey electronics. It is one of the lowestcost general purpose transistors currently available on the market, and compares well with the bc range of npn transistors. The various notations for transistor gain can be summarised as below.
The construction and terminal voltages for a bipolar npn transistor are shown above. The 2n3904 is common generalpurpose lowpower npn transistor used amplifying or switching applications. Npn silicon transistor descriptions general small signal application switching application features low collector saturation voltage collector output capacitance complementary pair with 2n3906 ordering information type no. The assured values ought to be used for reliable layout. Free packages are available maximum ratings rating symbol value unit collector. Your transistor information sheet ought to offer the two nominal values for beta and re as nicely a assured values. Figure 2 is the result of resimulating the circuit using the new model.
This is the current gain for a transistor expressed as an h parameter hybrid parameter. Transistor, npn, to92 online from elcodis, view and download 2n3904 pdf datasheet, transistors bjt single specifications. The 2n3904 is used very frequently in hobby electronics projects, including homemade ham radios, codepractice oscillators, analog amplification, and interfacing device for. Recent listings manufacturer directory get instant insight into any electronic component. The transistor npn the digital potentiometer from one to millions of transistors thousands in dedicated circuits amplifiers, led drivers, timers, clocks, information on datasheets the transistor npn a current amplifier makes small currents bigger the 2n3904 transistor. You should know that spice models are created by curve fitting so the beta value you see may not be the same as the datasheet. Important 2n3904 specifications from the datasheet. The 2n3904 is a small signal generalpurpose npn transistor.
Emitter saturation voltage vbesat ic 10ma, ib 1ma 0. Npn transistor tutorial the bipolar npn transistor. Ive been saving my used batteries in a box for recycle and now im taking it out and use the remaining voltage to light a 10mm led as my night light in my room,livingroom,kitchen,hallways and lights in the bathroom so my kids dont have to turn on the light at night when they do no. The letter f indicates that it is a forward transfer characteristic, and the letter e indicates. Transistor 2n3904 bipolar bjt npn general purpose pack of 50 by fairchild. Npn switching transistor mmbt3904 limiting values in accordance with the absolute maximum rating system iec 604. The 2n3904 is a common npn bipolar junction transistor used for generalpurpose lowpower. In lab 1 model parameters for the 2n3904 transistor were determined. Onsemi general purpose transistorsnpn silicon,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. There ought to be a assured minimum for beta and maximum for re. If this higher beta is used in the calculation, ic becomes 4. As can be seen in figure 1, the simulated collector current is 1. These parameters and associated formulas are utilised in semiconductor calculations. The transistor npn 2n3904 datasheet maximum thermal.
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