Bf494 transistor equivalent book

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. A substitute transistor must have the same polarity, either pnp or npn, as the original. If you install the wrong polarity, the sandwich wont work. Jan 23, 2020 the components for assembly of the fm spy bug transmitter with bf494. Bf494 bf494 npn medium frequency transistor datasheet buy. It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter. At the maximum voltage, also called a breakdown voltage bv, electrons. International transistor equivalents guide bernard babani.

Bf254 rf transistor equivalent nte108 kp components inc. Information furnished is believed to be accurate and reliable. Bf494 datasheet npn frequency transistor nxp, bf494 pdf, bf494 pinout, bf494 manual, bf494 schematic, bf494 equivalent, bf494 data, bf494 circuit. Bf494 tm npn rf transistor to92 absolute maximum ratings symbol 1. Knowing how to substitute an alternate transistor type can speed up your. Hi guys, i have a circuit for am generation using bf494 beta 160 and and an ift 455 khz etc. Smallsignal transistor data book, 86 pages, 1984, motorola.

Full text of siemens transistors data book 198081 see other formats. Free device maximum ratings rating symbol value unit collector. Transistor substitution desoldering and replacing a transistor takes very little time. Applications output stage of a vision if amplifier. The problem is that i dont know how we arrive at the resistor and capacitor values in this circuit. Nte a leading electronics supplier of semiconductors, capacitors, resistors, led products and more. If more than a maximum voltage rating is applied to a transistor, it can be permanently damaged. Attention with the value of the capacitors, so that there is no change of position, c1, c2, c3, c5 must be ceramic. Symbol vcbo vceo vebo ic icm ptot tstg tj tamb note 1. Im making a radio, it has a bf979 transistor and a bf494 transistor, is there any other transistors with the exact same characteristics for both them two transistors but better transition frequency for better results. Bf494a datasheet, equivalent, cross reference search. The original transistor might need special ordering, or be discontinued and unavailable. I want to use my course material to write a book in the future. Great performance or range is not guaranteed here, because this is an elementary design.

But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article. What has the same characteristics as the bf494 but better tensition frequency, and same question for the bf979. Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34. Applications hf applications in radio and television receivers fm tuners. Simplest fm transmittermodulation circuit with bf494. Simplest fm transmittermodulation circuit with bf494 radio.

Bf422 high voltage transistors npn silicon features this is a pb. Everyday low prices and free delivery on eligible orders. Discrete semiconductors data sheet book, halfpage m3d186 bf494. It might sound stupid but im in a real doubt since many datasheets disagree regarding the bf494 transistor pinout.

Mar 31, 2017 bf494 datasheet npn frequency transistor nxp, bf494 pdf, bf494 pinout, bf494 manual, bf494 schematic, bf494 equivalent, bf494 data, bf494 circuit. Bf495 npn medium frequency transistors 1997 jul 08 product. The schmitttrigger is a circuit which creates hysteresis and which is useful in digitizing an analog signal into a digital signal of either high or low. With out knowing what and ware your are using it, you should choose a similar part.

There are books galore on this but surely someone knows of a site that has them listed and searchable my query is a simple one i have no 2n5551 transistors on hand and i want to see if one in my box will do the job. Follow asked 4 years ago by vikasgurlinka in circuits. Bf495 bf495 transistor transistor bf494 transistor bf495 bf494 transistor. Bf494 npn medium frequency transistors components datasheet pdf data sheet free from datasheet data sheet search for integrated.

Npn medium frequency transistor bf199 package outline unit a outline references version european projection issue date iec jedec jeita mm 5. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by michaels, adrian isbn. Overview bf494 npn medium frequency transistor international shipping starts from usd. Bc327 pnp, bc337 npn, bc517 npn, bc547 npn, bc548 npn, bc549 npn, bc550 npn, bc556 pnp, bc557 pnp, bc558 pnp organized within a convenient plastic storage case, plastic box can be reused. The components for assembly of the fm spy bug transmitter with bf494. Bf494b datasheet, equivalent, cross reference search. How to choose a replacement for a bipolar transistor total. Bf495d datasheet, equivalent, cross reference search. General purpose radio frequency transistor bf 494 q1 is used here for obtaining fm modulation. Nte is a company that specializes in cross referenced parts.

Bf495 bf495 transistor transistor bf494 transistor bf495 bf494 transistor equivalent transistors bf494 bf494 equivalent bf494b bf494 application note text. Can general purpose transistors like 2n3904, 2n4401, bc547, 2n2222, etc. Bf494 bf494b npn medium frequency transistorbuy online electronic components shop wholesale best lowest price india. The 2n3904 is a common npn bipolar junction transistor used for generalpurpose lowpower amplifying or switching applications. 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. 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. It is designed for low current and power, medium voltage, and. The transistor bf494 can be replaced by the bf495 without problems, this transistor easy to be found in the trade. Irf520p to220 nchannel power mosfet rf final and en369dr companion part. More time is spent figuring out which one to replace and, sometimes, what to replace it with.

I want to build this circuit, but i dont have the proper transistors. Product specification supersedes data of september 1994 file under discrete semiconductors, sc04 1997 jul 08. Bf495 limiting values in accordance with the absolute maximum rating system iec 4. A very good 1 watt fm transmitter circuit, very easy to build circuit. Characteristics tamb 25 c unless otherwise specified. Thus the bc548 or bc546 to 550 is a valid substitute in any circuit designed for the older bc108 or bc148, which includes many mullard and philips. Transistor equivalent book pdf free download by corfikome. The bc548 is a generalpurpose npn bipolar junction transistor commonly used in european. Crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. Bf199 npn medium frequency transistor dbook, halfpage m3d186. 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. Bf494 datasheet, equivalent, cross reference search.

Next is a resonance stage and the final stage built with a minimum 1w transistor which must have a heatsink. Npn medium frequency transistor bf199 limiting values in accordance with the absolute maximum rating system iec 604. One of my interests is restoring vintage transistor radios. Bf450 pnp medium frequency transistor book, halfpage m3d186. Cross reference universal transistor reference page 1. Here is the circuit diagram of the simplest fm transmitter using a transistor. Bf495 datasheet, equivalent, cross reference search. Is there anything available to see if a particular transistor can be replaced with a different one. World transistor equivalents data az by eca author 4. Bf494 datasheet23 pages fairchild npn rf transistor. 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. Methinks you need to study electronics more deeply. I have a am generation circuit using bf494 transistor. Bf494, bf494 datasheet, bf494 npn medium frequency transistor datasheet, buy bf494 transistor.