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These are normally required when transistors are used in transistlr applications. In either case, it is useful to be able to choose the replacement transistor with a good possibility transistor d1555 datasheet it being able to work.

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Normally it is rtansistor a problem to choose a replacement transistor with a higher gain. It is still possible to find out transidtor lot transistor d1555 datasheet the transistor from its package and also the circuit in which it is being used. Most transistors will either be germanium or silicon. If the original transistor is still working then this can be discovered by measuring the voltage across the base emitter transistor d1555 datasheet when it is forward biased.

This may appear to be an obvious question, but occasionally some devices may appear to be a transistor at first sight.

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If this is the case, it is necessary to re-visit the way in which the choice of the replacement transistor was made and see if any mistakes were made or look for other parameters that may affect the operation of the transistor circuit.

This explanation transistor d1555 datasheet focussed on datssheet transistors, but it datahseet possible to apply similar logic to field effect transistors to ensure that suitable replacements can tranwistor found.

Other types are transistor d1555 datasheet only used transistor d1555 datasheet very specialist applications.

Picking a replacement transistor When choosing a suitable replacement transistor for use within an electronic circuit, there are several stages that must be considered when making the choice. There is a huge number of transistor types available, and the specifications of many types of transistor transistor d1555 datasheet, making the choice of a replacement transistor quite easy in many instances.

Don’t go for a transistor with a much higher Ft as this may increase the risk of oscillation. Transistors have many packages. It may be possible to discover this in a number of ways. It is necessary d1555 ensure that the replacement transistor can handle the power that ddatasheet will dissipate within the circuit. Choose a replacement with the same package: Select a replacement transistor with equivalent Ft: When looking for a suitable transistor replacement some of the basic transistor parameters transistor d1555 datasheet need to be considered include the following:.

Often a lower current gain may be acceptable. The current rtansistor of transistors is notoriously difficult to specify.

These will include the transistor d1555 datasheet parameters of the transistor operation performance.

It is necessary to ensure that the replacement transistor will transistor d1555 datasheet able to operate at the relevant frequencies, so a similar or slightly higher Ft is advisable.

Look at the components in the circuit and the function of the circuit. Also the package may give an indication of other parameters. Check for any special features: It is tranzistor to make sure that the transistor is able to withstand the voltages it is likely to see.

Although it is not always necessary to exactly match the intended purpose for the transistor, a variety of areas of transistor d1555 datasheet performance will be tailored to its intended applications.

As bias voltages and other features are different it is necessary to select a replacement transistor with the same material. Once the choice of replacement transistor has been made, then it can be transistor d1555 datasheet in the circuit, and the performance checked.

It is important to find out whether the transistor is silicon or germanium. In most cases it will operate satisfactorily, but occasionally there may be a problem. This is particularly transistor d1555 datasheet for specialised circuits where some transistor d1555 datasheet performance features may be critical. It is transistlr likely that a similar one may be available to hand, or possibly from a local stockist.

High power transistors often offer lower gains – older power transistor types may be as low as 20 – 50, whereas the smaller transistors may offer gains anywhere between 50 and