The important ratings in switching circuits are the maximum collector current icmax and the minimum current gain h fe min. If you calculate the transistor base resistor for a 400 ohm relay load, you will find it to be 56k, but i use 10k which does not make any difference expect a some ma more dissipation or wastage by. Diodes and transistors pdf 28p this note covers the following topics. They are suitable for use in driver stages, low noise input stages and signal processing circuits of television. Bc limiting values in accordance with the absolute maximum rating system iec 4. And instead of just telling you what it does, they explain that it consists of ndoped and pdoped materials. Some circuits use tun for transistor universal npn and this is the same as our reasoning the transistortype ddatasheet just to let you know. Transistor relay driver circuit with formula and calculations. This data sheet and its contents the information belong to the members of the premier farnell group of companies the group or are licensed to it. Bc series types are small signal npn silicon transistors, manufactured by. T018 pnp bc107 bc177 bc108 bc178 bc109 bc179 high current amplifiers npn t05 pnp bft39 bft79. The transistors voltage ratings may be ignored unless you are using a supply voltage of more than about 15v.
This means you can use any npn transistor, such as 2n2222, bc108, 2n3704, bc337 and hundreds of others. Electronics tips and tricks daatasheet page 2 all about circuits. Suitable for applications requiring low noise and good hfe linearity, eg. Bc178 datasheet, bc178 pdf, bc178 data sheet, bc178 manual, bc178 pdf, bc178, datenblatt, electronics bc178, alldatasheet, free, datasheet, datasheets, data sheet. The complementary pnp types are respectively thebc177, bc178 and bc179. When supply is given to the circuit, the voltage divider. Transistor mounted on an fr4 printed circuit board. The bc is a 45v silicon pnp bipolar planar epitaxial transistor with low power. The bc107, bc108 and bc109 are generalpurpose low power silicon npn bipolar junction transistors found very often in equipment and electronics booksarticles from europe, australia and many other countries from the 1960s. Bc108 low noise general purpose audio amplifiers description the bc107 and bc108 are silicon planar epitaxial npn transistors in to18 metal case. A transistors base terminal voltage required to turn on the transistor ranges from 0.
In relay circuits i normally use a 10k resistor as the transistor base resistor for all relays whose coil resistance is between 200 ohm and 400 ohms. Bc108 transistor datasheet pdf the central semiconductor bc, bc. It is datashest good way to test a transistor and confirm it is working. Low noise general purpose audio amplifiers, bc108 datasheet, bc108 circuit, bc108 data sheet. Philips npn general purpose transistors,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Bc107bc108 series low power bipolar transistors page 2 200406 v1. You can change the resistor value but the base input voltage should not exceed the range. Bc series types are small signal npn silicon transistors, manufactured by the epitaxial planar process. The way that a 2n2222, bc107, bc108 and bc109 transistor symbol maps to the physical device is shown in the diagram below. Some circuits use tun for transistor universal npn and this is the same as our reasoning the transistor type is just to let you know it is not critical. Basic semiconductor physics, diodes, the nonlinear diode model, load line analysis, large signal diode models, offset diode model, transistors, large signal bjt model, load line analysis, small signal model and transistor amplification.
We have many circuits below, simpleone transistor dztasheet a difference 3. Bc108 datasheet, bc108 pdf, bc108 data sheet, bc108 manual, bc108 pdf, bc108, datenblatt, electronics bc108, alldatasheet, free, datasheet, datasheets, data sheet. Experiment 6 transistors as amplifiers and switches. Absolute maximum ratings value symbol parameter bc107 bc108. There is a table showing technical data for some popular transistors on the transistors page. The generalpurpose range of transistors is a good substitute for basic noncritical audio applications, as these transistors are similar and equivalents to each other. For example, a bc108 transistor can have a current gain of 300, meaning that the collector. Purchase online from our catalog of active and passive electronic components from over manufacturers. Bc datasheet, bc pdf, bc data sheet, bc manual, bc pdf, bc, datenblatt, electronics bc, alldatasheet, free, datasheet, datasheets, data sheet.
They are suitable for use in driver stages, low noise input stages and signal processing circuits of television reveivers. A bc108 transistor is an npn negativepositivenegative bipolar transistor. Bcb, bca, b, c, bcb, c amplifier transistors npn silicon. Free transistor circuits books download ebooks online. Transistor transistors for beginners in electronics. Npn silicon planar epitaxial transistors, bc108 datasheet, bc108 circuit, bc108 data sheet. Some circuits use tun for transistor universal npn and this is the same as our reasoning the transistortype is just to let you know. Microelectronics, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. They were created by philips and mullard in 1963 and introduced in april 1966. The bc108 is a low power general purpose npn transistor in a metal package. The humble transistor q1 emitter e collector c base b transistor basics emitter to base junction is forward biased normally collector to base junction is reverse biased normally transistors are current operated devices, so. Matching transistor pairs are available with 5% and 10% matching on hfe or hfe. Stmicroelectronics, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
Low power bipolar transistors bc107 bc108 series page 240412 v1. Unit vcbo collectorbase voltage open emitter bc107. We have many circuits below, simpleone transistor to a difference 3. The bc548 is a part of a family of npn and pnp epitaxial silicon transistors that originated with the metalcased bc108 family of transistors. The bc141 is also a general purpose npn transistor in a metal package with a higher voltage rating probably unnecessary in your application and higher current rating.
The bc549c is an npn transistor belonging to a group of generalpurpose npn semiconductors consisting of bc547, bc548, and bc549. Bc107, bc108, bc109 npn general purpose transistors. Some circuits use tun for transistor universal npn and this is the same. Collector emitter continuous voltage with zero base current bc107. Initially in metal to18 packages, the range expanded over time to include other package. A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is a good way to test a transistor and confirm it is working. A bc transistor is an npn negativepositivenegative bipolar transistor. The bc107, bc108 and bc109 are silicon planar epitaxial npn transistors in to18 metalcase. Bc107 bc108bc109 low noise general purpose audio amplifiers description the bc107, bc108 and bc109 are silicon planar epitaxial npn transistors in to18 metal case. Bc107 bc108 series low power bipolar transistors page 2 200406 v1. Transistor bc108 bc325 bc178 bf179 bf177 transistor npn bc178 applications of transistor bc108 bc326 bfq35 text. A transistor amplifies current and can be used as a switch, as explained on this page.
Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. How transistors work is probably the hardest concept for you to understand as a beginner. These transistors are utilised in audio frequency, and small signal directly coupled preamplifiers. Free devices maximum ratings rating symbol value unit collector.
Bc108 datasheet, equivalent, cross reference search. Experiment 6 transistors as amplifiers and switches our final topic of the term is an introduction to the transistor as a discrete circuit element. Electronics club transistor circuits functional model. Mono preamp mic based bc108 transistor amplifier circuit. Bc108 npn general purpose transistor, bc108 npn transistor, bc108 datasheet, bc108 pdf, bc108 buy, bc108 online, bc108 india. The traansistor curves focus on the output of the transistor, but we can also consider the behavior of the input. The problem is that almost everyone is trying to teach that a transistor is a semiconductor device. Bc datasheet, bc npn small signal transistor datasheet, buy bc transistor. They are suitable for use in driver stages, low noise input stages and signal processing circuits of television receivers.
Bcbc series low power bipolar transistors page 3 v1. Bc107 datasheet, equivalent, cross reference search. Since an integrated circuit is constructed primarily from dozens to even millions of transistors formed from a single, thin silicon crystal, it. Bc107 bc108 low noise general purpose audio amplifiers description the bc107 and bc108 are silicon planar epitaxial npn transistors in to18 metal case. You can build this circuit with two standard 5mm red leds and any general purpose low power npn transistor bc108, bc182 or bc548 for example. It is mainly composed of three terminals named as an emitter, base, and collector. Introduction to bc107 bc107 is an npn bipolar planner low power transistor which is mainly designed for general purpose switching and amplification purpose. Mono preamp mic based bc108 transistor amplifier circuit december 20, 2011 the microphone preamp based transistor described here is powered by 9 v and less than 1 ma current consumption, it will allows you to use a small 9 v rectangular conventional battery for several hours.