Bf494 transistor equivalent book

Bf494a datasheet, equivalent, cross reference search. Bf494b datasheet, equivalent, cross reference search. 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. 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.

Bf494 bf494 npn medium frequency transistor datasheet buy. 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. Here is the circuit diagram of the simplest fm transmitter using a transistor. Nte a leading electronics supplier of semiconductors, capacitors, resistors, led products and more. 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. Bf495 bf495 transistor transistor bf494 transistor bf495 bf494 transistor equivalent transistors bf494 bf494 equivalent bf494b bf494 application note text. 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. How to choose a replacement for a bipolar transistor total. One of my interests is restoring vintage transistor radios. Overview bf494 npn medium frequency transistor international shipping starts from usd.

Knowing how to substitute an alternate transistor type can speed up your. It has 4 transistors, one is a very stable oscillator, followed by a buffer stage to prevent frequency variation when you adjust the transmitter. Simplest fm transmittermodulation circuit with bf494 radio. Aug 25, 2011 crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. Motorola smallsignal transistors, fets and diodes device data 5 package dimensions notes. 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. Follow asked 4 years ago by vikasgurlinka in circuits. 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. Is there anything available to see if a particular transistor can be replaced with a different one. It is designed for low current and power, medium voltage, and. Great performance or range is not guaranteed here, because this is an elementary design. It might sound stupid but im in a real doubt since many datasheets disagree regarding the bf494 transistor pinout.

The problem is that i dont know how we arrive at the resistor and capacitor values in this circuit. Hi guys, i have a circuit for am generation using bf494 beta 160 and and an ift 455 khz etc. Semiconductors data sheet book, halfpage m3d186 bf494. Irf520p to220 nchannel power mosfet rf final and en369dr companion part. Home components hardware boards books kits futurlec the electronic components and semiconductor superstore. 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. Buy international transistor equivalents guide bernard babani publishing radio and electronics books by michaels, adrian isbn. If more than a maximum voltage rating is applied to a transistor, it can be permanently damaged. Bf495 limiting values in accordance with the absolute maximum rating system iec 4. Transistor equivalent book pdf free download by corfikome. Bf494 npn medium frequency transistors components datasheet pdf data sheet free from datasheet data sheet search for integrated. I want to use my course material to write a book in the future. Bf450 pnp medium frequency transistor book, halfpage m3d186. Bf494 datasheet npn frequency transistor nxp, bf494 pdf, bf494 pinout, bf494 manual, bf494 schematic, bf494 equivalent, bf494 data, bf494 circuit.

The components for assembly of the fm spy bug transmitter with bf494. World transistor equivalents data az by eca author 4. General purpose radio frequency transistor bf 494 q1 is used here for obtaining fm modulation. Crossreferences are not magic, understanding of the circuit and a parametric search of the important parameters is much more reliable. Next is a resonance stage and the final stage built with a minimum 1w transistor which must have a heatsink. 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. Smallsignal transistor data book, 86 pages, 1984, motorola.

Simplest fm transmittermodulation circuit with bf494. Hilitchi 250piece 10 values npn pnp power general purpose. 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. Bf494 datasheet23 pages fairchild npn rf transistor. Jan 23, 2020 the components for assembly of the fm spy bug transmitter with bf494. Bf422 high voltage transistors npn silicon features this is a pb. The 2n3904 is a common npn bipolar junction transistor used for generalpurpose lowpower amplifying or switching applications. Bf495 datasheet, equivalent, cross reference search. Bf495d datasheet, equivalent, cross reference search. At the maximum voltage, also called a breakdown voltage bv, electrons. Everyday low prices and free delivery on eligible orders. Free device maximum ratings rating symbol value unit collector. Product specification supersedes data of september 1994 file under discrete semiconductors, sc04 1997 jul 08. Transistor substitution desoldering and replacing a transistor takes very little time.

Characteristics tamb 25 c unless otherwise specified. More time is spent figuring out which one to replace and, sometimes, what to replace it with. Nte is a company that specializes in cross referenced parts. Symbol vcbo vceo vebo ic icm ptot tstg tj tamb note 1. Cross reference universal transistor reference page 1. But the reliability and failure modes of vintage transistors is interesting, and is the subject of this article. With out knowing what and ware your are using it, you should choose a similar part. Methinks you need to study electronics more deeply. Bf494 bf494b npn medium frequency transistorbuy online electronic components shop wholesale best lowest price india. Discrete semiconductors data sheet book, halfpage m3d186 bf494. What has the same characteristics as the bf494 but better tensition frequency, and same question for the bf979. Information furnished is believed to be accurate and reliable. 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.

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. The bc548 is a generalpurpose npn bipolar junction transistor commonly used in european. The transistor bf494 can be replaced by the bf495 without problems, this transistor easy to be found in the trade. Bf199 npn medium frequency transistor dbook, halfpage m3d186. I want to build this circuit, but i dont have the proper transistors. Npn medium frequency transistor bf199 package outline unit a outline references version european projection issue date iec jedec jeita mm 5. Can general purpose transistors like 2n3904, 2n4401, bc547, 2n2222, etc.

Bf254 rf transistor equivalent nte108 kp components inc. Texas instruments transistor and diode databook 1st ed 1973 datasheets for diodes from 1n251 on and transistors from 2n117 on acrobat 7 pdf 34. Bf495 bf495 transistor transistor bf494 transistor bf495 bf494 transistor. Bf494, bf494 datasheet, bf494 npn medium frequency transistor datasheet, buy bf494 transistor. Applications hf applications in radio and television receivers fm tuners. Bf494 tm npn rf transistor to92 absolute maximum ratings symbol 1. Npn medium frequency transistor bf199 limiting values in accordance with the absolute maximum rating system iec 604. The original transistor might need special ordering, or be discontinued and unavailable.