So we cannot process or ship any order untill april 14. The transmitter uses 2 mpsh10 equiv bf494 or nte229 transistors in a doubleended freerunning voltage controlled oscillator vco operating at half the output frequency on each side and combined at l2, which is tuned to the 2nd harmonic of the vco and covers the 88108 mhz range. Bf494 npn medium frequency transistor to control the impact of the covid19 outbreak, indian gov. Bf494 bf494 npn medium frequency transistor datasheet buy bf494.
Electrically similar devices, such as the mmbt3904, are available in a variety of small throughhole and surfacemount packages, including to92, sot23. Npn medium frequency transistor bf199 limiting values in accordance with the absolute maximum rating system iec 604. A to5 transistor with a p d of 3 watts might be able to dissipate 810 watts with a heat sink. Npn silicon rf small signal transistor, bf494 datasheet, bf494 circuit, bf494 data sheet. Microelectronics, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. A bf494 npn rf transistor tm july 2006 bf494 npn rf transistor to92 absolute maximum ratings ta 25c unless otherwise noted these ratings are limiting values above which the serviceability of any semiconductor device may be impaired. You are far better off understanding the specifications, particular those of particular interest to your application, and using a book or table of specs to find a proper substitute, or posting on sites like aac for help choosing. Does anyone know where the site is that you type in a transistor and get a list of equivalent transistor. Here is the circuit diagram of the simplest fm transmitter using a transistor. Bf494 datasheet23 pages fairchild npn rf transistor. Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34.
Follow asked 4 years ago by vikasgurlinka in circuits. Home transistors general purpose bf series bf494 bf494 npn medium frequency transistor datasheet buy bf494 technical information philips semiconductors bf494 datasheet. Semiconductor transistor, diode, ic cross reference. Im no expert at transistor selection, but i dont see anything in the datasheet that screams out im special.
Smallsignal transistor data book, 86 pages, 1984, motorola. The bc548 is a generalpurpose npn bipolar junction transistor commonly used in european. Simplest fm transmittermodulation circuit with bf494 radio. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by adrian michaels isbn. It allows the flow of electrons only under certain conditions. Product specification supersedes data of september 1994 file under discrete semiconductors, sc04 1997 jul 08. Applications hf applications in radio and television receivers fm tuners. Vrt comparison table for semiconductors from a to z edition. This is elektor electronics 12000 12000 82k bf494 5v8 t2 bf451 bf494 bf451 t3 c b e bf494 c3 1v3 100n r4 220 r3 560 000005 11, shortwave band. Motorola small signal transistor data book 1984 ed. I am looking for equivalent to bf494 or bf495 transistor. International transistor equivalents guide bernard babani.
Atmjuly 2006bf494npn rf transistorabsolute maximum ratings ta 25c unless otherwise noted datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. Transistors substitutionsequivalents all about circuits. I decided to use ksp2222a to replace the bc548, and mpsh10 for the bf494. The bf4945 are good bets, but these are obsolete, so youre looking for nos. It might sound stupid but im in a real doubt since many datasheets disagree regarding the bf494 transistor. But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article.
Bf494b datasheet, equivalent, cross reference search. Switch at its most basic, a transistor is a switch. I keep looking for equivalent transistors, and sometimes find a website that gives a list equivalent transistor. Bf495 npn medium frequency transistors 1997 jul 08 product specification supersedes data of september 1994 file under discrete semiconductors, sc04 philips semiconductors product specification npn medium frequency transistors bf494. Bf495 npn medium frequency transistors 1997 jul 08 product. Methinks you need to study electronics more deeply. However, sgsthomson microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. Characteristics tamb 25 c unless otherwise specified.
Then a transistor with no series emitter resistor and its base biased at 0. This shopping feature will continue to load items when the enter key is pressed. Bf495 datasheet, equivalent, cross reference search. Everyday low prices and free delivery on eligible orders. Bf495 limiting values in accordance with the absolute maximum rating system iec 4. Mar 31, 2017 bf494 datasheet npn frequency transistor nxp, bf494 pdf, bf494 pinout, bf494 manual, bf494 schematic, bf494 equivalent, bf494 data, bf494 circuit. Cross reference electronic circuits, tv schematics, audio. Wherever you need to control the flow of electricity in a device from transistor radios, to diodes, to circuit boards you can find a great collection of transistors on ebay. Of course, after 40 plus years of life, most electrolytic capacitors are suspect and the carboncomposition resistors have drifted high and sometimes become very noisy. Bf422 high voltage transistors npn silicon features this is a pb. Ic cross reference cross reference ci stk cross reference ci tda cross reference ci sharp cross reference hitachi audio ic cross reference and circuit applications smd cross reference and equivalent we make every effort to ensure that the material on this site is accurate, however we do not warrant or represent that the information is free.
Bf494 bf494b npn medium frequency transistorbuy online electronic components shop wholesale best lowest price india. In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Bf494, bf494 datasheet, bf494 npn medium frequency transistor datasheet, buy bf494 transistor. The 2n3904 is a common npn bipolar junction transistor used for general purpose lowpower. Sample pages of the vrt comparison books from eca edition 20102011 vrt volume 1 from a to z split into 2 books vrt1a and vrt1b 1496 pages isbn 9783937469379 vrt volume 2 from 0 to 680 pages isbn 9783937469386. Bf494 bf199 datasheet, cross reference, circuit and application notes in pdf format. Discrete semiconductors data sheet book, halfpage m3d186 bf494. Simple fm radio circuit using a single transistor last updated on february 23, 2020 by swagatam 173 comments when it comes to making an fm receiver its always thought to be a complex design, however the one transistor simple fm receiver circuit explained here simply shows that it isnt the case after all. Heat sinks and fans increase the ability of a transistor to dissipate heat. Apr 05, 2008 i during 80s and 90s, i used to search for components equivalents in books. One of my interests is restoring vintage transistor radios. Bf495, bf495 npn medium frequency transistor, buy bf495 transistor. Hilitchi 250piece 10 values npn pnp power general purpose transistors assortment kit bc327bc558. General purpose radio frequency transistor bf 494 q1 is used here for obtaining fm modulation.
Is there any webbased or stand alone program to do such service for transistors and ics. Articles transistors in vintage radios marks pages home. In certain cases, the quoted collector current may be exceeded. Mar 10, 2009 all the substitution books i have seen have been highly unreliable. Simple fm radio circuit using a single transistor homemade. If its in an rf circuit, then be sure the f t is at least 120mhz, and that it has a low c re.