General purpose radio frequency transistor bf 494 q1 is used here for obtaining fm modulation. Characteristics tamb 25 c unless otherwise specified. This is a wikipedia book, a collection of articles which can be downloaded electronically or ordered in print. The transistor im testing was made by motorola and is a know good working device in the current application circuit, in which i desoldered the transistor from. But 8050 and 8550 seem by fit to make pushpull amplifer. More time is spent figuring out which one to replace and, sometimes, what to replace it with. It has been very useful for me because it doesnt provide only the nte replacements. International transistor equivalents guide bernard babani. Free transistor circuits books download ebooks online. M9642, the full number is 48869642 and now you can cross reference the transistor. Oct 24, 2015 i am searching something can replace these transistors. Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34.
Unit icbo collector cutoff current ie 0 for bf 457 for bf 458 for bf 459 vcb 100 v vcb 200 v vcb 250 v 50 50 50 na na na vbrceo collectoremitter breakdown voltage ib 0 ic10ma for bf 457. Wikipedia books are maintained by the wikipedia community, particularly wikiproject wikipedia books. Bf195 datasheet, equivalent, cross reference search. If more than a maximum voltage rating is applied to a transistor, it can be permanently damaged. Diode 1n9148 1n4307 1n4532 diode 1n3605 2n2222 chip 2n2369 transistor se708 ma1704 ma1703 text. Understanding transistor replacement, substitution and information is very important for a electronic repairer. Bridgold 20pcs tip120 to220 npn darlington bipolar power transistor, 5a 60v hfe. Regarding the bf194 5 types, when these partially fail, the symptom is a loss of sensitivity in the receiver. The original transistor might need special ordering, or be discontinued and unavailable. This is a pdf format of the well known hardware pinout book, which covers various computer, electrical and electronic item pinouts. Tube bf 194 or rohre bf194 id34990, transistor, wires and vhf shown. I keep looking for equivalent transistors, and sometimes find a website that gives a list equivalent transistor. So we cannot process or ship any order untill 3rd may. Discrete semiconductors data sheet book, halfpage m3d186 bf494.
Pinning pin description 1 base 2 emitter 3 collector fig. Vrt comparison table for semiconductors from a to z edition. Vrt comparison table for semiconductors from a to z. Finding transistor replacement can take you hours if you dont know the right method to do it. Aug 25, 2011 crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. Everyday low prices and free delivery on eligible orders. One of my interests is restoring vintage transistor radios. Sn76477 2n4401 free transistor equivalent book semiconductor. Transistor equivalent or substitute used for power amplifier.
Bf199, bf494, 2n4001, 2n4003, mpsa18 and there are all i have. Bf422 high voltage transistors npn silicon features this is a pb. Simplest fm transmittermodulation circuit with bf494 radio. Ecg transistor replacement guide book free 2sb337 transistor. Here is the circuit diagram of the simplest fm transmitter using a transistor. Home actives transistor transistor silicon npn bf194. Bf194 datasheet, bf194 pdf, bf194 data sheet, bf194 manual, bf194 pdf, bf194, datenblatt, electronics bf194, alldatasheet, free, datasheet, datasheets, data sheet. The bc548 is a generalpurpose npn bipolar junction transistor commonly used in european. Design and application of transistor switching circuits. Bf194 datasheet, equivalent, cross reference search. Transistor equivalent book pdf free download by corfikome. Bf494 npn medium frequency transistor to control the impact of the covid19 outbreak, indian gov. Bf324 cross reference electronic circuits, tv schematics. Transistor equivalent electronics forum circuits, projects.
Npn medium frequency transistor bf199 package outline unit a outline references version european projection issue date iec jedec eiaj mm 5. Bf199 npn medium frequency transistor dbook, halfpage m3d186. Pnp medium frequency transistor bf450 limiting values in accordance with the absolute maximum rating system iec 604. Bc516 equivalent bf195 equivalent bf195 bf194 bf197 2n4996. Oct 06, 2015 say you had a motorola house number, i. I am searching something can replace these transistors. Applications output stage of a vision if amplifier. The bf194 has a near equivalent in the bf184, the bf1q5 in the bf185, the. Searching the right transistor for substitution is a skill, if you replace wrong specifications of transistor i.
Bc516 equivalent bf195 equivalent bf195 bf194 bf197 2n4996 transistor bf194 2n918 plastic bf595 text. A substitute transistor must have the same polarity, either pnp or npn, as the original. Bf195 equivalent datasheet, cross reference, circuit and application notes in pdf. Understanding transistor replacement, substitution and. A complete guide to semiconductor replacement and substitutions from the makers of photofactr service documentation. Bf194 datasheet, bf194 pdf, bf194 data sheet, datasheet, data sheet, pdf. A high frequency transistor, specifically designed for low noise front end rf applications. It goes further and it offers exactly what you were talking in this topic, real replacements like the 80s and 90s replacements crossreference books. 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. Semiconductor transistor, diode, ic cross reference. We request our customers to stay at home and stay safe. Transistor base numbers bfxxxx cricklewood electronics.
Suitable for applications requiring low noise and good hfe linearity, eg. Even a versend now for free satile multimeter that we teach 76 page book. Crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. The assignment of transistor elements b,c,e to leads, i. 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. Simplest fm transmittermodulation circuit with bf494. If you install the wrong polarity, the sandwich wont work. Full text of mullard technical handbook book 1 part 2. Book this book does not require a rating on the quality scale.
Without knowing its usage, you have to make sure the replacement transistor meets or exceeds every spec, since you dont know which ones the circuit relies on. Transistor substitution desoldering and replacing a transistor takes very little time. To control the impact of the covid19 outbreak, indian gov. In certain cases, the quoted collector current may be exceeded. Applications hf applications in radio and television receivers fm tuners. Apr 05, 2008 it has been very useful for me because it doesnt provide only the nte replacements. So called equivalent parts, or nte replacements, may not work at all in some cases, because they were worse in some spec, or the circuit was designed with the assumptions that the part had a fairly low bandwidth. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by michaels, adrian isbn. 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. Ive quoted figures from a mullard data book published in 1979. At the maximum voltage, also called a breakdown voltage bv, electrons. Npn transistor 2n2222,three pins 2n2222 npn transistor to92 npn transistor assortment ki 2n2222a,20 pcs.
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. View forum posts private message view blog entries view articles full member level 5 join date jun 2005 posts 240 helped 45 45 points 4,206 level 15. Articles transistors in vintage radios marks pages home. The best equivalent transistors are the af12x series that are the same piece of germanium. Great performance or range is not guaranteed here, because this is an elementary design. Bf494 datasheet, equivalent, cross reference search. Only after i tune the capacitors do i get 9 db out at 175 mhz. When i apply 400 mhz, the transistor oscillates wildly and gets very hot. Bf450 pnp medium frequency transistor book, halfpage m3d186. Searching the right transistor for substitution is a skill, if you replace wrong specifications of transistor. Wikipedia books can also be tagged by the banners of any relevant wikiprojects with classbook.
Transistor circuits books this section contains free e books and guides on transistor circuits, some of the resources in this section can be viewed online and some of them can be downloaded. Smallsignal transistor data book, 86 pages, 1984, motorola. Pnp b772 transistor replacement electrical engineering. But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article. More than 490,000 part numbers, type numbers, and other identifying numbers listed. Knowing how to substitute an alternate transistor type can speed up your. Npn medium frequency transistor bf199 limiting values in accordance with the absolute maximum rating system iec 604. Bf194 equivalent datasheet, cross reference, circuit and application notes in pdf. Methinks you need to study electronics more deeply. The best equivalent transistors are the af12x series that are the same piece of germanium, but mounted in a to72 case. Bf194 bf194 bf195 npn transistor components datasheet pdf data sheet free from datasheet data sheet search for integrated. Cross reference universal transistor reference page 1. Bf254 rf transistor equivalent nte108 kp components inc.