The letter f indicates that it is a forward transfer characteristic, and the letter e indicates it is for a common emitter configuration. This transistor series further divides into three groups consisting of bc547a, bc547b, and bc547c, according to the current gain. The 2n3904 is a small signal generalpurpose npn transistor. So if 1ma is fed into the base of a transistor and it has a hfe of 100, the collector current will be 100ma. General purpose transistorsnpn silicon, 2n3904 datasheet, 2n3904 circuit, 2n3904 data sheet. To my knowledge the current gain is also known as the dc collector current or the hfe. Hello, i have some small signal transistor 2n3904 that shall be deployed amplifying an analog signal which have been converted to analog through a resistor ladder. The 2n3904 and the 2n2222 are 2 of the most popular npn bipolar junction transistors in the electronics market. The small letter h indicates it is a small signal gain. So if 1ma is fed into the base of a transistor and it has a hfe of 100, the collector current will be 100ma every transistor has its own unique hfe. If i am pushing volage to the base why are we talking about current at the base. The 2n3904 is normally a switching transistor, but it works very well as a linear amplifier.
If you use a transistor with high hfe then the base current is very low. A transistor works by feeding a current into the base of the transistor. The 2n3904 is common generalpurpose lowpower npn transistor used amplifying or switching applications. An illustration of the pin out of a standard to92 package for digikey part number 2n3904fsnd. The hfe or the forward current gain of the device is between 100 to 300. 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 bc547 is an npn transistor belonging to a group of generalpurpose npn semiconductors. Absolute maximum ratings t a 25c unless otherwise noted. The central semiconductor 2n3903 and2n3904 types are npn silicon transistors designed forgeneral purpose amplifier and switching applications. I strongly recommend you to search around on the internet about bipolar transistor bias or transistor amplifier design to get some useful references about the subject. Hefei luogang international airport, in anhui, china, now defunct.
Onsemi, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. I think you are using a general purpose 2n3904 that does not have a very high hfe, it is from 80 to 250 or typically 230. For the hfe current gain, both transistors are available in all three groups a, b, and c. So i stopped buying 2n3904 transistors and just use 2n2222 transistors for any application that requires either. 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 an extremely popular npn transistor that is used as a simple electronic switch or amplifier that can handle 200 ma absolute maximum and frequencies as high as 100 mhz when used as an amplifier. Compare pricing for on semiconductor 2n3904 across 12 distributors and discover alternative parts, cad models, technical specifications, datasheets, and more on octopart.
But the hfe is a wide range and could be as low as 20 when its vce is 1v and its collector current is 0. Transistor 2n3904 pinout and specifications homemade. A 2n3904 transistor s beta max value is 150 and min value is 100. Hfe gene, a gene that encodes the human hemochromatosis protein.
It is typically used for lowcurrent, medium voltage, and moderate speed purposes. This transistor features fast switching, short turn off and low saturation voltage hence is suitable for switching and amplification. Jul 20, 2018 a 2n3904 has an hfe of between about 25 and 400, depending on the operating conditions. The base current cannot be easily calculated in your new circuit without a series base resistor. The 2n3904 is a npn silicon rf transistor for audio amplifier and switching. Bipolar bjt single transistor, npn, 40 v, 300 mhz, 625 mw, 200 ma, 100 hfe. C2458 datasheet vcbo50v, npn transistor toshiba, 2sc2458 datasheet, c2458 pdf, c2458 pinout, c2458 manual, c2458 schematic, c2458 equivalent. Mar 28, 2017 the transistor actually works as a current gainer. This transistor is also available in a throughthehole to92 bulk, and ammopack versions. The hfe is normally seen to be a constant value, normally.
The hfe number is interesting, but the pdf also usually has additional listing details for saturation. In case youre curious about which to use, or which one is better or superior than the other, in this article, we compare and contrast the 2 transistors. May 29, 2016 c2458 datasheet vcbo50v, npn transistor toshiba, 2sc2458 datasheet, c2458 pdf, c2458 pinout, c2458 manual, c2458 schematic, c2458 equivalent. Breadboard gain test and multimeter hfe test of 2n2222 and. Unit small signal current gain at vce 10 v, ic 1 ma, f 1 khz hfe 100 400 output admittance at vce 1 v, ic 1 ma, f 1 khz hoe 140ms noise figure at vce 5 v, ic 100 ma, rg 1 kw, f 10 e 15000 hz nf 5 db. The above diagram show a typical microcontroller interface circuit using npn transistor. Flat of transistor is on top d74z m to92 radial ammo packaging configuration. Complete technical details can be found at the 2n3904 datasheet given at the end of this page. Hefei xinqiao international airport, in anhui, china.
The 2n3904 from multicomp is a through hole, npn silicon planar switching transistors in to92 metal can package. That means less trips to the store and less junk in my kit. The useful dynamic range extends to 100 ma as a switch and to 100 mhz as an amplifier. Understanding hfe in data sheets all about circuits. Absolute maximum ratings ta 25c unless otherwise noted. Multicomp 2n3904 bipolar bjt single transistor, npn, 40v, 300mhz, 625mw, 200ma, 300 hfe. Fairchild npn general purpose amplifier,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Pdf 2n3903 2n3904 2n3905 2n3906 100ma st 2n3904 transistor st 2n3904.
I tested some of the transistor in two different multimeters and obtained similar results. Mar 18, 20 if you use the minimum hfe of 100,as juguar suggest in you design the circuit will always work for any 2n3904. Full part numberto92 case datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes. Design your circuit so it still works properly when the hfe of the transistor is 20 to 300 and the collector voltage and current is whatever you need. A transistor hfe changes too much with the bias, therefore you will always have to work with approximations. Pdf 2n3903, 2n3904 2n3903 2n3904g 2n3904 2n3904 hfe 2n3904rlra. The transistor 2n3904 comes under the category of npn small signal, low power, general purpose transistor, mainly applicable for switching and for signal amplification. Pinning pin description 1 collector 2 base 3 emitter fig. When figuring out dc current gain, the beta value is part of the formula. The base current is then amplified by hfe to yield its amplified current. It is designed for low current and power, medium voltage, and can operate at moderately high speeds. Recent listings manufacturer directory get instant insight. Npn switching transistor 2n3904 features low current max. And this the current gain depends on the collector current.
Maximum collector to emitter breakdown voltage for a 2n3904 transistor is 40 volts. Unit hfe hfe hfe hfe hfe hfe hfe hfe hfe hfe, f1khz c, output amittance current gain 100 mhos 200 hoe, output admittance hfe, 2 vce1v tj125a c 25a c hfe normalized 1 0. Free lead finish maximum ratings rating symbol value unit collector. It says so plainly in the data sheet characteristics charts. The 2n3904 is an extremely popular npn transistor that is used as a simple electronic switch or amplifier that can handle 200 ma absolute maximum and frequencies as high as 100 mhz when used as an amplifier figure 1. Also, i thought that current and voltage are not interchangable. Kst900 3 2n3904 electrical characteristic curves fig. Hparameter model h fe, the current gain of a bipolar junction transistor. C ambient temperature unless otherwise specified symbol min. A 2n3904 transistors beta max value is 150 and min value is 100. Then i measure the current each transistor passes through the collector when connected directly to a power supply and controlled by that base current to get an estimate of the gain.
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