If this higher beta is used in the calculation, ic becomes 4. Pricing and availability on millions of electronic components from digikey electronics. The various notations for transistor gain can be summarised as below. Less power would be dissipated and leave more voltage for the load.
There ought to be a assured minimum for beta and maximum for re. 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. Marking package code 2n3904 2n3904 to92 outline dimensions unit. But we want the transistor in saturation where v cesat is only 0.
Transistor 2n3904 bipolar bjt npn general purpose pack. Your transistor information sheet ought to offer the two nominal values for beta and re as nicely a assured values. Important 2n3904 specifications from the datasheet. You could raise that capacity by making it an 820 ohm resistor. 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. As can be seen in figure 1, the simulated collector current is 1. One of our members talks about using beta in the calculation for the value of the base resistor for the switching transistor. The transistor npn important 2n3904 specifications from. The 2n3904 from multicomp pro is a through hole, npn silicon planar switching transistors in to92 metal can package. Onsemi general purpose transistorsnpn silicon,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. It is one of the lowestcost general purpose transistors currently available on the market, and compares well with the bc range of npn transistors.
Symbol parameter conditions value unit rthja thermal resistance from junction to ambient note 1 250 kw symbol parameter conditions min. Figure 2 is the result of resimulating the circuit using the new model. Some manufacturers mark ebc on the molded part, but all are required to have those connections for a part which is a 2n3904. The transistor npn important 2n3904 specifications from the. Npn transistor tutorial the bipolar npn transistor. 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. 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. 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. The 2n3904 is a common npn bipolar junction transistor used for general purpose lowpower. Emitter saturation voltage vbesat ic 10ma, ib 1ma 0. Semiconductor components industries, llc, 2003 december, 2003. Recent listings manufacturer directory get instant insight into any electronic component. This is the basic notation for the forward current gain of a transistor.
Transistor 2n3904 bipolar bjt npn general purpose pack of 50 by fairchild. The 2n3904 is common generalpurpose lowpower npn transistor used amplifying or switching applications. Characteristics datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. Transistor, npn, to92 online from elcodis, view and download 2n3904 pdf datasheet, transistors bjt single specifications. 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 construction and terminal voltages for a bipolar npn transistor are shown above. Everything was going great till i came to the transistor part. You can see that with an 860ohm transistor on the base, 253ma is being delivered. The base current must simply be 110th the collector current for the 2n3904 transistor and for most other transistors. 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.
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. Npn switching transistor 2n3904 thermal characteristics note 1. 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. I use these for my joule thief project that i found on youtube while searching how to save energy. Npn switching transistor mmbt3904 limiting values in accordance with the absolute maximum rating system iec 604. Hi, if you double click on the transistor and select the edit model button, the beta parameter is bf. Mmbt3904 npn switching transistor dbook, halfpage m3d088. It is typically used for lowcurrent, medium voltage, and moderate speed purposes. Datasheet contains the design specifications for product development.
Free packages are available maximum ratings rating symbol value unit collector. The 2n3904 is used very frequently in hobby electronics projects, including homemade ham radios, codepractice oscillators, analog amplification, and interfacing device for. The assured values ought to be used for reliable layout. The letter f indicates that it is a forward transfer characteristic, and the letter e indicates. The transistor npn 2n3904 datasheet maximum thermal. This is the current gain for a transistor expressed as an h parameter hybrid parameter. Hello, i am trying to teach myself some beginner elecronics by going through the book electronic experiments for the evil genius. The datasheet is printed for reference information only. This transistor is also available in a throughthehole to92 bulk, and ammopack versions. I think my 3904 transistor might not be working as it should. Feb 15, 2011 your transistor information sheet ought to offer the two nominal values for beta and re as nicely a assured values. The 2n3904 is a small signal generalpurpose npn transistor.
In lab 1 model parameters for the 2n3904 transistor were determined. The 2n3904 is a common npn bipolar junction transistor used for generalpurpose lowpower. Transistor 2n3904 bipolar bjt npn general purpose pack of. This transistor features fast switching, short turn off and low saturation voltage hence is suitable for switching and amplification. These parameters and associated formulas are utilised in semiconductor calculations. 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. It is a gain parameter associated with the transistor operating in the analog or linear range.